Journal of Polymer Science

Papers
(The TQCC of Journal of Polymer Science is 5. The table below lists those papers that are above that threshold based on CrossRef citation counts [max. 250 papers]. The publications cover those that have been published in the past four years, i.e., from 2020-05-01 to 2024-05-01.)
ArticleCitations
Click chemistry strategies for the accelerated synthesis of functional macromolecules140
Block copolymer solution self‐assembly: Recent advances, emerging trends, and applications93
A practical guide to quartz crystal microbalance with dissipation monitoring of thin polymer films84
Recent progress in polymer hydrogel bioadhesives79
Properties and applications of precision oligomer materials; where organic and polymer chemistry join forces71
Cyclic polymers: Advances in their synthesis, properties, and biomedical applications70
An overview of boron nitride based polymer nanocomposites69
Recent progress in microporous polymers from thermally rearranged polymers and polymers of intrinsic microporosity for membrane gas separation: Pushing performance limits and revisiting trade‐off line67
Fluorine‐phosphate copolymerization waterborne acrylic resin coating with enhanced anticorrosive performance57
Recent development on bio‐based thermosetting resins56
Ion separations with membranes56
Chemically specific coarse‐graining of polymers: Methods and prospects54
Flexible and wearable strain sensors based on conductive hydrogels51
Organic dye‐based photoinitiating systems for visible‐light‐induced photopolymerization50
Progress in the mechanical enhancement of hydrogels: Fabrication strategies and underlying mechanisms48
Recent advances in polymeric facilitated transport membranes for carbon dioxide separation and hydrogen purification48
Recent development of polyimides: Synthesis, processing, and application in gas separation47
Recent progress in organic field‐effect transistor‐based integrated circuits47
Recent progress in conductive self‐healing hydrogels for flexible sensors46
Chitosan‐based nanocomposites for medical applications44
Mechanisms and applications of bioinspired underwater/wet adhesives43
Molecularly engineering polymeric membranes for H2/CO2 separation at 100–300 °C43
Metal–organic framework‐based mixed‐matrix membranes for gas separation: An overview42
Multifunctional liquid metal polymer composites41
Sustainability performance of polyethylene terephthalate, clarifying challenges and opportunities41
Polymer coatings on magnesium‐based implants for orthopedic applications40
Highly stretchable, self‐adhesive, and self‐healable double network hydrogel based on alginate/polyacrylamide with tunable mechanical properties40
High strength, acid‐resistant composites from canola, sunflower, or linseed oils: Influence of triglyceride unsaturation on material properties39
Molecular design strategies for high‐performance organic electrochemical transistors38
Photoinduced step‐growth polymerization of thieno[3,4‐b] thiophene derivatives. The substitution effect on the reactivity and electrochemical properties38
A library of thermoresponsive PEG‐based methacrylate homopolymers: How do the molar mass and number of ethylene glycol groups affect the cloud point?37
Design of ketone derivatives as highly efficient photoinitiators for free radical and cationic photopolymerizations and application in 3D printing of composites36
Manning condensation in ion exchange membranes: A review on ion partitioning and diffusion models36
Polymer 4D printing: Advanced shape‐change and beyond36
Hydrogel adhesives for generalized wound treatment: Design and applications35
Highly sensitive, stretchable and durable strain sensors based on conductive double‐network polymer hydrogels34
Elastic and durable multi‐cation‐crosslinked anion exchange membrane based on poly(styrene‐b‐(ethylene‐co‐butylene)‐b‐styrene)34
In situ generation of Ag nanoparticles during photopolymerization by using newly developed dyes‐based three‐component photoinitiating systems and the related 3D printing applicat31
Resonant soft X‐ray scattering in polymer science31
Polymerization kinetic pathways of epoxidized linseed oil with aliphatic bio‐based dicarboxylic acids30
Chemical upcycling of poly(ethylene terephthalate) waste: Moving to a circular model30
Synthesis of polyethylene thermoplastic elastomer by using robust α‐diimine Ni(II) catalysts with abundant tBu substituents30
Hydrocarbon separations by glassy polymer membranes30
Electrospinning nanofibers of microbial polyhydroxyalkanoates for applications in medical tissue engineering29
Gelation and yielding behavior of polymer–nanoparticle hydrogels29
Improving the efficiency and sustainability of catalysts for direct arylation polymerization (DArP)28
Application of conductive polymer hydrogels in flexible electronics28
Recycling of polyurethane wastes using different carboxylic acids via acidolysis to produce wood adhesives28
Amphiphilic micro‐ and nanogels: Combining properties from internal hydrogel networks, solid particles, and micellar aggregates27
Recent progress in EPR study of spin labeled polymers and spin probed polymer systems27
Chemical recycling to monomers: Industrial Bisphenol‐A‐Polycarbonates to novel aliphatic polycarbonate materials26
Recent advances of organometallic complexes in emerging photovoltaics26
Analytical estimates of front velocity in the frontal polymerization of thermoset polymers and composites24
Water‐assisted mechanical testing of polymeric thin‐films24
Implantable application of polymer‐based biosensors24
Recent advances on the structure–properties relationship of multiblock copolymers24
Polymeric materials for solar water purification24
Differential dynamic microscopy for the characterization of polymer systems23
Orthogonal synthesis and modification of polymer materials23
Synthesis, structure, and function of internally functionalized dendrimers23
How rigid are conjugated non‐ladder and ladder polymers?23
Tailoring polyethersulfone/quaternary ammonium polysulfone ultrafiltration membrane with positive charge for dye and salt selective separation23
Neuromorphic bioelectronics based on semiconducting polymers23
Novel low‐dielectric constant and soluble polyimides from diamines containing fluorene and pyridine unit23
Near‐infrared light for polymer re‐shaping and re‐processing applications23
Natural polymers used in the dressing materials for wound healing: Past, present and future22
Heat‐resistant polyimides with lowCTEand water absorption through hydrogen bonding interactions22
All‐organic polymer blend dielectrics of poly (arylene ether urea) and polyimide: Toward high energy density and high temperature applications22
Benzophenone derivatives as novel organosoluble visible light Type II photoinitiators for UV and LED photoinitiating systems22
Amphiphilic well‐defined degradable star block copolymers by combination of ring‐opening polymerization and atom transfer radical polymerization: Synthesis and application as drug delivery carriers22
Photomechanical polymer hydrogels based on molecular photoswitches21
Overview and critical survey of polyamide6 structural habits: Misconceptions and controversies21
The mysterious blue emission around 440 nm in carbonyl‐based aliphatic clusteroluminogens21
The chemical effect of furfuryl amide on the enhanced performance of the diphenolic acid derived bio‐polybenzoxazine resin21
Stereochemical language in supramolecular polymer chemistry: How we can do better21
Recent developments of polysaccharide‐based double‐network hydrogels21
Fabrication and applications of stimuli‐responsive micro/nanopillar arrays20
Plasticization mechanism in polybenzimidazole membranes for organic solvent nanofiltration: Molecular insights from in situ FTIR spectroscopy20
Robust and recoverable dual cross‐linking networks in pressure‐sensitive adhesives20
The versatile, functional polyether, polyepichlorohydrin: History, synthesis, and applications20
Radical ring‐opening polymerization of lipoates: Kinetic and thermodynamic aspects20
Validation of experimental results for graphene oxide‐epoxy polymer nanocomposite through computational analysis20
Copolymers of 4‐thieno[3,2‐b]thiophen‐3‐ylbenzonitrile with anthracene and biphenyl; synthesis, characterization, electronic, optical, and thermal properties19
Direct synthesis of hyperbranched ethene oligomers and ethene‐MA co‐oligomers using iminopyridyl systems with weak neighboring group interactions19
A systematic investigation of the ring size effects on the free radical ring‐opening polymerization (rROP) of cyclic ketene acetal (CKA) using both experimental and theoretical a19
Advance of click chemistry in anion exchange membranes for energy application19
Microgels as drug carriers for sonopharmacology19
Interlocking degradation of vinyl polymers via main‐chain CC bonds scission by introducing pendant‐responsive comonomers19
Biomimetic double network hydrogels: Combining dynamic and static crosslinks to enable biofabrication and control cell‐matrix interactions19
Construction of amperometric biosensor modified with conducting polymer/carbon dots for the analysis of catechol19
Effect of bond exchange rate on dynamics and mechanics of vitrimers19
Polyimides with low coefficient of thermal expansion derived from diamines containing benzimidazole and amide: Synthesis, properties, and the N‐substitution effect19
Front velocity dependence on vinyl ether and initiator concentration in radical‐induced cationic frontal polymerization of epoxies18
Controlling the shape of the molecular weight distribution for tailored tensile and rheological properties in thermoplastics and thermoplastic elastomers18
Novel phenylamine‐based oxime ester photoinitiators for LED‐induced free radical, cationic, and hybrid polymerization18
Realizing fast photoinduced recovery with polyfluorene‐block‐poly(vinylphenyl oxadiazole) block copolymers as electret in photonic transistor memory devices17
Polymeric membranes: chemistry, physics, and applications17
Optimizing the self‐assembly of conjugated polymers and small molecules through structurally programmed non‐covalent control17
Mechanism of interaction between hydroxypropyl cellulose and water in aqueous solutions: Importance of polymer chain length17
Self‐assembled monolayers for interface engineering in polymer solar cells17
Incorporating polymers within a single‐crystal: From heterogeneous structure to multiple functions16
Trans‐limonenedioxide, a promisingbio‐basedepoxy monomer16
Trinuclear salphen–chromium(III)chloride complexes as catalysts for the alternating copolymerization of epoxides and cyclic anhydrides16
One‐pot tandem ring‐opening polymerization of N‐sulfonyl aziridines and “click” chemistry to produce well‐defined star‐shaped polyaziridines16
ROP of L‐lactide and ε‐caprolactone catalyzed by tin(ii) and tin(iv) acetates–switching from COOH terminated linear chains to cycles16
The iterative synthesis of discrete dimethylsiloxane oligomers: A practical guide16
Synthesis and performance of flexible epoxy resin with long alkyl side chains via click reaction16
Strain induced strengthening of soft thermoplastic polyurethanes under cyclic deformation16
Revealing the effect of oligo(ethylene glycol) side chains on n‐doping process in FBDPPV‐based polymers16
Homopolyimides containing both benzimidazole and benzoxazole with highTgand low coefficient of thermal expansion16
PDEGMA‐b‐PDIPAEMA copolymers via RAFT polymerization and their pH and thermoresponsive schizophrenic self‐assembly in aqueous media16
Comparison of the reactivity of isomeric 2H‐ and 3H‐naphthopyran mechanophores16
The mechanochemical Friedel‐Crafts polymerization as a solvent‐free cross‐linking approach toward microporous polymers15
Direct observation of the formation of a cyclic poly(alkyl sorbate) via chain‐growth polymerization by an N‐heterocyclic carbene initiator and ring‐closing with15
A review on elastic graphene aerogels: Design, preparation, and applications15
Thermal transport and chemical effects of fillers on free‐radical frontal polymerization15
Near‐infrared light activated core‐shell electrospun nanofibers decorated with photoactive plasmonic nanoparticles for on‐demand smart drug delivery applications15
Reformulating the permselectivity‐conductivity tradeoff relation in ion‐exchange membranes15
Sequential crosslinking for mechanical property development in high sulfur content composites15
Novel chalcone derivatives with large conjugation structures as photosensitizers for versatile photopolymerization14
'Smart' light‐reflective windows based on temperature responsive twisted nematic liquid crystal polymers14
Capsules with polyurea shells and ionic liquid cores for CO2 capture14
Coherent anti‐Stokes Raman scattering microscopy for polymers14
Heterogeneous photoredox catalysis using fluorescein polymer brush functionalized glass beads14
Facile fabrication of underwater superoleophobic membrane based on polyacrylamide/chitosan hydrogel modified metal mesh for oil–water separation14
Functional initiators for the ring‐opening polymerization of polyesters and polycarbonates: An overview14
Multifunctional fibrous wound dressings for refractory wound healing14
Synthesis and properties of novel colorless and thermostable polyimides containing cross‐linkable bulky tetrafluorostyrol pendant group and organosoluble triphenylmethane backbone structure14
On‐surface synthesis of porous graphene nanoribbons containing nonplanar [14]annulene pores14
Tough and fluorescent hydrogels composed of poly(hydroxyurethane) and poly(stearyl acrylate‐co‐acrylic acid) with hydrophobic associations and hydrogen bonds as the physical crosslinks14
Silicone‐based polymer blends: Enhancing properties through compatibilization14
How side‐chain hydrophilicity modulates morphology and charge transport in mixed conducting polymers14
Covalent organic frameworks for applications in lithium batteries14
Modeling of light scattering and haze in semicrystalline polymers13
Cyanines comprising barbiturate group facilitate NIR‐light assisted ATRP under anaerobic and aerobic conditions at two wavelengths using Fe(III) catalyst13
In‐situ fabrication of barium titanate@polyvinyl pyrrolidone in polyvinylidene fluoride polymer nanocomposites for dielectric capacitor applications13
Morphological origins of temperature and rate dependent mechanical properties of model soft thermoplastic elastomers13
Near infrared photopolymer for micro‐optics applications13
Eco‐friendly solution processing of all‐polymer solar cells: Recent advances and future perspective13
Slippery liquid‐infused porous surface via thermally induced phase separation for enhanced corrosion protection13
pH and thermo responsive aliphatic tertiary amine chromophore hyperbranched poly(amino ether ester)s from oxa‐Michael addition polymerization13
Thermo‐responsive polymers for thermal regulation in electrochemical energy devices13
Surface modification of ZIF‐90 with triptycene for enhanced interfacial interaction in mixed‐matrix membranes for gas separation13
Viscosity reduction in polymer nanocomposites: Insights from dynamic neutron and X‐ray scattering13
Effect of resin staging on frontal polymerization of dicyclopentadiene13
Recent advances in sodium alginate‐based membranes for dehydration of aqueous ethanol through pervaporation13
Effect of molecular structure of curing agents on cyclic creep in highly cross‐linked epoxy polymers13
Fracture behavior and mechanical, thermal, and rheological properties of biodegradable films extruded by flat die and calender13
Synthesis and characterization of highly soluble wholly aromatic polyamides containing both furanyl and phenyl units13
Graphene oxide crosslinker for the enhancement of mechanical properties of polylactic acid13
Biodegradation of water‐soluble and water‐dispersible polymers for agricultural, consumer, and industrial applications—Challenges and opportunities for sustainable materials solu12
Centrifugally spun poly(ethylene oxide) fibers rival the properties of electrospun fibers12
Photoinitiation mechanisms and photogelation kinetics of blue light induced polymerization of acrylamide with bicomponent photoinitiators12
Correlating conductivity and Seebeck coefficient to doping within crystalline and amorphous domains in poly(3‐(methoxyethoxyethoxy)thiophene)12
Characterization of polyoxometalate/polymer photo‐composites: A toolbox for the photodegradation of organic pollutants12
Conductivity–modulus–Tg relationships in solvent‐free, single lithium ion conducting network electrolytes12
Injectable and self‐healing hydrogels with tissue adhesiveness and antibacterial activity as wound dressings for infected wound healing12
In situ constructed Ti3C2Tx MXene/polypyrrole composite with enhanced sodium storage capacity for efficient hybrid capacitive deionization12
Antibacterial ultrafiltration membrane with silver nanoparticle impregnation by interfacial polymerization for ballast water12
A novel conjugated porous polymer based on triazine and imide as cathodes for sodium storage12
Synthesis and properties of polypeptoid‐containing block copolymers: A review12
Facile synthesis of phenyl‐rich functional siloxanes from simple silanes12
Film formation of hard‐core/soft‐shell latex particles11
Inter‐spherulitic/inner‐spherulitic localization of PBSU during crystallization of PVDF in PVDF/PBSU blend11
Recent progress in flow‐induced polymer crystallization11
Polarization of ionic liquid and polymer and its implications for polymerized ionic liquids: An overview towards a new theory and simulation11
Understanding dispersity control in photo‐atom transfer radical polymerization: Effect of degree of polymerization and kinetic evaluation11
Recent advances in covalent organic polymers‐based thin films as memory devices11
Asymmetric layer‐by‐layer polyelectrolyte nanofiltration membranes with tunable retention11
Alkaline‐developable and negative‐type photosensitive polyimide with high sensitivity and excellent mechanical properties using photo‐base generator11
Mesoporous carbons from self‐assembled polymers11
Polymethacrylamide—An underrated and easily accessible upper critical solution temperature polymer: Green synthesis via photoiniferter reversible addition–fragmentation chain transfer polymerization a11
Depolymerization of poly(α‐methyl styrene) with ball‐mill grinding11
Small dop of comonomer, giant shift of cloud point: Thermo‐responsive behavior and mechanism of poly(methylacrylamide) copolymers with an upper critical solution temperature11
Amphiphilic AxBy mikto‐arm star copolymers with PLMA and POEGMA arms: Self‐assembly and drug encapsulation11
Elucidating dynamic behavior of synthetic supramolecular polymers in water by hydrogen/deuterium exchange mass spectrometry11
Characterization of polymeric surfaces and interfaces using time‐of‐flight secondary ion mass spectrometry11
Target grafting of poly(2‐(dimethylamino)ethyl methacrylate) to biodegradable block copolymers11
Simple polymerization through oxygen at reduced volumes using oil and water11
Synthesis and design of hypercrosslinked porous organic frameworks containing tetraphenylpyrazine unit for high‐performance supercapacitor10
Monodispersed polymer particles with tunable surface structures: Droplet microfluidic‐assisted fabrication and biomedical applications10
High‐temperature creep resistant ternary blends based on polyethylene and polypropylene for thermoplastic power cable insulation10
Synthesis and properties of σ‐π conjugated porous polymers obtained with Mizoroki–Heck reaction of tetra vinyl cyclic siloxane with dibromo fluorene10
Crack propagation behaviors in a nanoparticle‐filled rubber studied by in situ tensile electron microscopy10
Rational design of hyper‐crosslinked polymers for biomedical applications10
The effect of polymer grafting on the mechanical properties of PEG‐grafted cellulose nanocrystals in poly(lactic acid)10
GISAXS: A versatile tool to assess structure and self‐assembly kinetics in block copolymer thin films10
Photo‐controlled alignment and helical organization in main‐chain liquid crystalline alternating polymers10
A new carbazolyl‐basedacylphosphine oxide photoinitiator with high performance and low migration10
PDMS mixed‐matrix membranes with molecular fillers via reactive incorporation and their application for bio‐butanol recovery from aqueous solution10
Design of super‐tough and antibacterialPPR/nano‐ZnOcomposites based on the excellent dispersion ofZnOparticles10
A comprehensive study: Theoretical and experimental investigation of heteroatom and substituent effects on frontier orbitals and polymer solar cell performances10
Reversibly self‐assembled pH‐responsive PEG‐p(CL‐g‐TMC) polymersomes10
The in‐vitro biocompatibility of ureido‐pyrimidinone compounds and polymer degradation products10
β‐Cyclodextrin‐based macroporous monoliths: One‐pot oil‐in‐oil emulsion templating and adsorption10
Nucleation and crystallization kinetics of polyamide 12 investigated by fast scanning calorimetry10
Synthesis and design of polyurethane and its nanocomposites derived from canola‐castor oil: Mechanical, thermal and shape memory properties10
Evaluating the impact of functional groups on membrane‐mediated CO2/N2 gas separations using a common polymer backbone10
Preparation of hydrophilic poly(vinylidene fluoride) membrane by in‐situ grafting of N‐vinyl pyrrolidone via a reactive vapor induced phase separation procedure9
How accurately do mechanophores report on bond scission in soft polymer materials?9
Highly selective mono‐functionalization of open‐cage silsesquioxane toward film‐formable homopolymer9
Synthesis and properties of fluorinated benzotriazole‐based donor‐acceptor‐type conjugated polymers via Pd‐catalyzed direct CH/CH coupling polymerization9
Recent developments of temperature‐responsive polymers for ophthalmic applications9
Recent progress in lactam‐based polymer semiconductors for organic electronic devices9
Cyclic allylic sulfide based photopolymer for holographic recording showing high refractive index modulation9
Advances in host selection and interface regulation of polymer electrolytes9
Enhanced antitumor chemo‐immunotherapy by local co‐delivery of chemotherapeutics, immune checkpoint blocking antibody and IDO inhibitor using an injectable polypeptide hydrogel9
Enhanced DOX loading in star‐like benzyl functionalized polycaprolactone micelles9
Regiochemical effects for the mechanochemical activation of 9‐π‐extended anthracene‐maleimide Diels–Alder adducts9
Functionalized acrylic polyhydroxy urethanes as molecular tool box for photocurable thermosets and 3D printing9
pH‐responsive polymers for drug delivery: Trends and opportunities9
Localized hydrogels based on cellulose nanofibers and wood pulp for rapid removal of methylene blue9
6FDA‐containing polyimide‐ionene + ionic liquid gas separation membranes9
Preparation, characterization, and dilute solution properties of four‐branched cage‐shaped poly(ethylene oxide)9
Nanofiltration‐like forward osmosis membranes on in‐situ mussel‐modified polyvinylidene fluoride porous substrate for efficient salt/dye separation9
Recycling of polyamides: Processes and conditions9
On‐surface synthesis and atomic scale characterization of unprotected indenofluorene polymers9
Welding dynamics in an atomistic model of an amorphous polymer blend with polymer–polymer interface9
Photoinitiated polymerization of methacrylates comprising phenyl moieties9
Hydrogel‐shelled biodegradable microspheres for sustained release of encapsulants8
In‐situ interfacial polymerization endows surface enrichment of COOH groups on anion exchange membranes for efficient Cl/SO42 separation8
Thermally stimulated depolarization current spectra of cross‐linked polyethylene and the influence of cross‐linking byproducts8
Enhancement of thermoelectric properties of D‐A conjugated polymer through constructing random copolymers with more electronic donors8
Fragility of short‐chain poly(lactic acid)s derivatives by combining dielectric spectroscopy and fast scanning calorimetry8
Ultra‐highTgand ultra‐low coefficient of thermal expansion polyimide films based on hydrogen bond interaction8
Controlling morphology, adhesion, and electrochromic behavior of PEDOT films through molecular design and processing8
Microfluidic fabrication of calcium alginate helical microfibers for highly stretchable wound dressing8
Tough and self‐healable carrageenan‐based double network microgels enhanced physical hydrogels for strain sensor8
Charge transfer complexes as dual thermal/photo initiators for free‐radical frontal polymerization8
Nitroxide mediated miniemulsion polymerization of methacryloisobutyl POSS: Homopolymers and copolymers with alkyl methacrylates8
Structure and gas transport characteristics of triethylene oxide‐grafted polystyrene‐b‐poly(ethylene‐co‐butylene)‐b‐polystyrene8
Modulation of stimuli‐responsiveness toward acid vapor between real‐time and write‐erase responses based on conjugated polymers containing azobenzene and Schiff base m8
Recent progress in fabrications and applications of functional hydrogel films8
A delicately designed functional binder enabling in situ construction of 3D cross‐linking robust network for high‐performance Si/graphite composite anode8
Photopolymerization of difunctional cyclopolymerizable monomers with low shrinkage behavior8
Hydrophobic association and ionic coordination dual crossed‐linked conductive hydrogels with self‐adhesive and self‐healing virtues for conformal strain sensors8
Synthesis and properties of 3,4‐dioxythiophene and 1,4‐dialkoxybenzene based copolymers via direct CH arylation: Dopant‐free hole transport material for perovskite solar cells8
Fluorene‐based donor‐acceptor‐type multifunctional polymer with bicarbazole pendant moiety for optoelectronic applications8
Synthesis of ionic polybenzimidazoles with broad ion exchange capacity range for anion exchange membrane fuel cell application8
Alternating copolymerization of carbon monoxide and vinyl arenes using [N,N] bidentate palladium catalysts8
Extrusion 3D printing of conjugated polymers8
End‐group cross‐linked membranes based on highly sulfonated poly(arylene ether sulfone) with vinyl functionalized graphene oxide as a cross‐linker and a filler for proton exchange membrane fuel cell a8
Spirulina‐based composites for 3D‐printing8
Synthesis and characterization of poly(ethylene glycol) bottlebrush networks via ring‐opening metathesis polymerization8
Modular, synthetic, thiol‐ene mediated hydrogel networks as potential scaffolds for 3D cell cultures and tissue regeneration8
Spherical polyelectrolyte brushes as bio‐platforms to integrate platinum nanozyme and glucose oxidase for colorimetric detection of glucose8
Transport and co‐transport of carboxylate ions and alcohols in cation exchange membranes8
Structurally‐tuned benzo[1,2‐b:4,5:b']dithiophene‐based polymer as a dopant‐free hole transport material for perovskite solar cells8
Selective uptake of different proteins by annealed and quenched cationic spherical polyelectrolyte brushes8
Methylene‐bridged bis(8‐arylimino)‐5,6,7‐trihydro‐quinolylinickel precatalysts for ethylene polymerization8
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