Several kinds of biodegradable hydrogels were prepared via in situ photopolymerization of Pluronic F127/poly(ε-caprolactone) macromer and acrylic acid (AA) comonomer in aqueous medium. The swelling kinetics measurements showed that the resultant hydrogels exhibited both thermoand pH-sensitive behaviors, and that this stimuli-responsiveness underwent a fast reversible process. With increasing pH...

The structural characterization of copolymers by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) remains a challenging task, since their random comonomer distribution creates very complicated mass spectra. In this study, a high-resolution TOF mass spectrometer with a spiral ion trajectory was applied to the structural and compositional characterization...

To unravel the relationship between silylene-bridged metallocene catalyst structures and polymerization conditions their effect on performance in in-reactor functionalization of polypropylene, behaviors rac-Me2Si(2-Me-4-Ph-Ind)2ZrCl2/MMAO, rac-Me2Si(Ind)2ZrCl2, rac-Me2Si(2-Me-4-Ph-Ind)2HfCl2, rac-Me2Si(Ind)2HfCl2 propylene/aluminum alkyl-passivated 10-undecen-1-ol copolymerization were compared...

Ethylene-norbornene copolymers were synthesized with a homogeneous catalyst system based on bis(imino) pyridine iron with the addition of diethyl zinc (DEZ) as alkyd transfer agent to promote immortal copolymerization. The addition of DEZ did not influence the catalytic activity in copolymerization with 7.5 mmol of norbornene (NB), but in the reactions with 70 mmol, the comonomer promoted an in...

Polystyrene (PS) is a major commodity polymer widely used in various applications ranging from packaging to insulation thanks its low cost, high stiffness, and transparency as well relatively softening temperature. Similarly all polymers prepared by radical polymerization, PS constituted of C–C backbone thus not degradable. To confer degradability such materials, the copolymerization vinyl mono...