Solution and aqueous miniemulsion polymerization of vinyl chloride mediated by a fluorinated xanthate
作者:Zhihui Huang、Pengju Pan、Yongzhong Bao
DOI:10.1002/pola.28074
日期:2016.7.15
Solution and aqueous miniemulsion polymerizations of vinyl chloride (VC) mediated by (3,3,4,4,5,5,6,6,7,7,8,8,8‐tridecafluorooctyl‐2‐((ethoxycarbonothioyl)thio) propanoate) (X1) were studied. The living characters of X1‐mediated solution and miniemulsion polymerizations of VC were confirmed by polymerization kinetics. The miniemulsion polymerization exhibits higher rate than solution polymerization
由(3,3,4,4,5,5,6,6,7,7,8,8,8,8-三氟甲基氟-2-((乙氧基碳硫基)硫代)介导的氯乙烯(VC)的溶液和水微乳液聚合丙酸酯(X1)。X1介导的溶液的活性和VC的细乳液聚合通过聚合动力学得到证实。细乳液聚合显示出比溶液聚合更高的速率。可逆加成-断裂链转移(RAFT)微乳液聚合中VC的最终转化率高达87%,并且与X1浓度无关。X1介导的RAFT微乳液聚合的引发过程受伯自由基的扩散-吸附过程控制。由于聚合环境的不均匀性以及液滴或胶乳颗粒中RAFT剂的浓度波动,用RAFT细乳液制备的PVC表现出相对较宽的分子量分布。此外,活性聚氯乙烯(PVC-X)与VC,醋酸乙烯酯(VAc)和N-乙烯基吡咯烷酮(NVP)表明,PVC-X可以重新引发和扩展,进一步证实了VC RAFT聚合的活性。PVC‐ b‐ PVAc二嵌段共聚物是通过RAFT微乳液聚合中的PVC‐X扩链成功合成的。©2016