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利用UV光照自引发、双异丙基硫杂蒽酮(BIITX)和异丙基硫杂蒽酮(ITX)引发氯乙烯(VC)聚合得到含缺陷结构或/和ITX残基的PVC.考察了不同引发方式时单体浓度、光强、反应时间和温度对单体转化率、产物分子量及其分布的影响,UV-Vis、1H-NMR和FTIR分析表明所得PVC含缺陷氯或/和ITX残基.以此PVC为大分子引发剂(缺陷结构和ITX残基为引发点),50℃下有效引发了甲基丙烯酸二甲氨基乙酯(DMAEMA)聚合,获得了PVC-g-PDMAEMA共聚物.相比起始PVC,接枝共聚物分子量稍有提高,PDI下降.1H-NMR和FTIR分析证实了接枝共聚物的形成,接枝共聚物在水(pH=3)中组装形成了稳定核-壳结构胶束,显示其具有两亲性.
Polymerization of vinyl chloride (VC) with bis (isopropylthioxanthone) and diisopropylthioxanthone (ITX) resulted in the formation of PVC with defect structure or / and ITX residues by self-priming with UV illumination. The effects of monomer concentration, light intensity, reaction time and temperature on the monomer conversion, product molecular weight and their distribution at different initiation modes were analyzed by UV-Vis, 1H-NMR and FTIR. The results showed that the resulting PVC containing defects chlorine or / and ITX residues (PVC) as a macroinitiator (defect structure and ITX residue as a trigger point), effectively initiating the polymerization of dimethylaminoethyl methacrylate (DMAEMA) at 50 ℃ to obtain the PVC-g-PDMAEMA copolymer The molecular weight of the graft copolymer increased slightly and the PDI decreased compared to the starting PVC.1H-NMR and FTIR analysis confirmed the formation of the graft copolymer, which formed a stable assembly in water (pH = 3) Core-shell micelles, showing that they have amphiphilicity.