Development of structures in new cycloolefin copolymers (COCs) of ethylene–norbornene (E–NB) and ethylene–tetracyclododecene (E–TD) of different NB/TD compositions were investigated under uniaxial elongational flow. For E–NB copolymer, which has multiblock sequences, a shoulder in WAXD at 0.76 nm was evident besides its amorphous halo, and the relative intensity of the peak increased with incre...

By combining detailed online kinetics of comonomer consumption with light scattering, viscosity, and conductivity data, experimental detection of changing degrees of counterion condensation was achieved by using comonomers of widely separated reactivity ratios that produced large composition drifts during synthesis. Endproducts of such syntheses contained mixtures of chains of widely varying li...

In this work, we studied propylene polymerization using some α-diimine palladium catalysts with systematically varied ligand sterics. In propylene polymerization, the ligand steric effect exhibits significant variations on the catalytic activity, polymer molecular weight, and branching density. However, the regio control for the polymer microstructure is poor. Furthermore, copolymerization of 1...

Ziegler-Natta (ZN) based co-polymerization processes for the production of linear low-density polyethylene (LLDPE) generally give rise to a non-uniform incorporation distribution comonomer. It has been shown that lowering titanation temperature during catalyst synthesis can increase evenness this distribution. However, polymerization process parameters also affect resulting To investigate these...

In this work, the grafting of maleic anhydride onto two types of linear low density polyethylene with hexene-1 comonomer (LLDPE-H1) and butene-1 comonomer (LLDPE-B1), in the presence of styrene monomer (St) and dicumyl peroxide initiator (DCP) has been studied. The combined influences of MAH, St and DCP on the grafting efficiency via a melt reactive mixing process have been investigated using r...

Front Cover: In article number 2200045, Thomas Hellweg and co-workers describe the preparation of a variety PNNPAM-based microgels copolymerized with methacrylic acid loaded monodisperse catalytically active palladium nanoparticles. The leads to interesting pH- thermoresponsive properties gel particles shows ambivalent influences regarding catalytic activity embedded cover page TEM images syste...

Hydrogels based on N-isopropylacrylamide and sodium acrylate as ionic comonomer were synthesized by free radical polymerization in water using N,N'-methylenebisacrylamide as crosslinker and ammonium persulfate as initiator. The glass transition of dried copolymers poly(N-isopropylacrylamide) (PNIPA) and poly(sodium acrylate) (SA) gels and demixing/mixing transition of PNIPA-SA hydrogels swollen...

A photo-curable 3-arm starshape polyacrylic acid was synthesized via aqueous atom-transfer radical polymerization (ATRP), followed by tethering with 2isocyanatoethyl methacrylate. The purified polymer was used to formulate with water, comonomer and Fuji II LC filler to form a photocurable glass-ionomer cement. Compressive strength (CS) was used for evaluation. The effects of MW, comonomer, fill...

In this study, monodisperse polystyrene nanospheres were prepared by dispersion polymerization using alcohol as reaction medium to prepare colloidal clusters of the latex beads. Polyvinylpyrrolidone (PVP) and 2-(methacryloyloxy)ethyltrimethylammonium chloride (MTC) were used as dispersion stabilizer and comonomer, respectively. The particle size could be controlled by adjusting the reactant com...

A series of copolymers is prepared using maleimide and 2-ethylacrylic acid as comonomer. This kind of copolymer shows low toxicity (LD50: 601-798 mg/kg) and significant curative effect on Lewis lung carcinoma and S180.