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Two distinct synthetic methodologies to furnish polynorbornene bearing thiol-maleimide adduct side groups, namely direct ring-opening metathesis polymerization (ROMP) of prefunctionalized monomers and postpolymerization modification, were investigated and compared in this study. ROMP of thiol-maleimide adduct-containing monomers M1-M4 was performed to yield polymers PM1-PM4 with full conversion of...
Two aromatic tetraketones, 4,4′-thiobis[(p-phenyleneoxy)benzil] (STK, 1) and 4,4′-thiobis[(p-phenylenesulfanyl)benzil] (3STK, 2) were synthesized by the nitro nucleophilic substituent reactions of 4-nitrobenzil and corresponding diol compounds. The two tetraketones were polymerized with three aromatic tetraamines, including 3,3′-diaminobenzidine (a), 3,3′,4,4′-tetraaminodiphenylether (b) and 3,3′,4,4′-tetraaminodiphenylsulfone...
The study reports a facile method of preparing poly(N-isopropylacrylamide)- based hydrogels by means of the Diels–Alder reaction. First, polymeric dienes were synthesized by free radical copolymerization between N-isopropylacrylamide (NIPA) and furfuryl methacrylate (FM), with 2, 2′-azobisisobutyronitrile (AIBN) as an initiator, and polymeric dienophile was obtained by a coupling reaction of poly(ethylene...
A set of segment polyurethanes were synthesized and were proved to have interconnected, isolated and no hard-segmented domains. It was found that the shape fixity of the polyurethanes decreased with the increase of hard-segment content. The polyurethanes with hard-segment content from 30% to 50% had to be deformed at least to 100% strain to obtain good shape fixity. The segmented polyurethane having...
At room temperature atom transfer radical polymerization (ATRP) of N-vinylpyrrolidone (NVP) was carried out using 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetra-azacyclo-tetradecane (Me 6 Cyclam) as ligand in 1,4-dioxane/isopropanol mixture. Methyl 2-chloropropionate (MCP) and copper(I) chloride were used as initiator and catalyst, respectively. The polymerization of NVP via ATRP could be mediated...
Hydrophobically modified water-soluble polymers have been prepared by micellar copolymerization of hydrophilic monomer acrylamide and the silicone-containing hydrophobic comonomer, tris(trimethylsiloxy)methacryloxypropylsilane in various molar ratios. Capillary viscometer, FT-IR, gel permeation chromatography-multi-angle laser light scattering, transmission electron microscopy, and 1 H NMR...
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