水溶性线形-超支化嵌均共聚物合成及表征

SYNTHESIS AND CHARACTERIZATION OF AQUEOUS LINEAR-HYPERBRANCHED BLOCK COPOLYMERS

摘要:

采用三羟甲基丙烷三马来酸单酯（TMPTM）与甲基丙烯酸(MAA)在水中进行自由基共聚，合成线形-超支化嵌均聚合物(LHBPs)。单体竞聚率数值表明TMPTM与MAA之间为典型的嵌均共聚，NMR、 lg[η]-lgMw关系规律以及支化因子g’研究结果表明，当单体摩尔比n (MAA)/n(MTPTM)小于48时，产物显示超支化聚合物特征，当n (MAA)/n(MTPTM)≥48时，聚合物呈现线形聚合物特征。DSC分析表明，LHBP-3聚合物玻璃化转变温度约为209.98℃，TGA表明在50-600℃升温过程中，LHBP聚合物有两次分解，分解温度分别为206.38℃(脱羧)和429.57℃（骨架分解）。

Abstract:

mono-trimethylolpropane trimaleates(TMPTM) and methacrylic acid(MAA) were employed to produce linear-hyperbranched block copolymers. Reactivity ratios of monomers indicated block copolymerization occured between TMPTM and MAA and produced linear-hyperbranched block copolymers, the indication was then confirmed by NMR, law of lg[η]-lgMw and branching factor g’. Furthermore, DSC revealed the Tg of LHBP is 209.98℃, TGA showed two-stage degradation occurred during heating-up from 50℃ to 600℃，first stage at 206.38℃(decarboxylization) and second at 429.57℃（backbone degradation）.