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苯乙烯的RAFT乳液聚合

发表时间:2012-04-15  浏览量:1261  下载量:507
全部作者: 胡承杰,杨海,陈丽,杨雷
作者单位: 浙江理工大学生态染整技术教育部工程研究中心
摘 要: 采用两亲可逆加成-断裂转移(reversible addition-fragmentation chain transfer, RAFT)试剂控制乳液聚合,制备得到具有较高分子量的聚苯乙烯活性链。研究发现:聚合反应分为成粒期、匀速期和降速期,各阶段对应的单体转化率与苯乙烯的传统乳液聚合相近;反应中生成聚合物的分子量与理论值吻合;受成核过程影响,初期产物的分子量分布较宽,后期分子量分布略有降低,反应结束时,产物数均分子量为70 000 g/mol,分子量分布指数(polydispersity index, PDI)仅为1.21;胶乳粒径接近单分布,反应呈现良好的活性聚合特征。进一步与RAFT细乳液聚合对比后证实,乳液聚合产物的PDI及粒径分布远低于细乳液聚合,在制备较高分子量的活性聚合物链时,RAFT乳液聚合技术更具优势。
关 键 词: 纺织化学与染整工程;活性自由基聚合;可逆加成-断裂转移;乳液聚合;两亲可逆加成-断裂转移试剂
Title: RAFT emulsion polymerization of styrene
Author: HU Chengjie, YANG Hai, CHEN Li, YANG Lei
Organization: Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education of China, Zhejiang Sci-Tech University
Abstract: Living polystyrene chains with higher molecular weight were synthesized via emulsion polymerization process mediated by amphiphilic reversible addition-fragmentation chain transfer (RAFT) agent. As indicated by the kinetic curves, the whole reaction period was divided into three stages: nucleation, constant rate and deceleration, which were similar to those in conventional emulsion polymerization. During reaction, experimental molecular weights agreed well with the theoretical ones, demonstrating the living characters of the polymerization. Influenced by the nucleation process, the molecular weight distributions were high initially, but they decreased afterwards. The polydispersity index (PDI) was only 1.21 when the average molecular weight Mn of the product grew to 70 000 g/mol finally. Meanwhile, the latex was of monodispersed particle size. These properties were all far superior to those of products from RAFT miniemulsion polymerization.
Key words: textile chemistry and dyeing and finishing engineering; living radical polymerization; reversible addition-fragmentation chain transfer; emulsion polymerization; amphiphilic reversible addition-fragmentation chain transfer agent
发表期数: 2012年4月第7期
引用格式: 胡承杰,杨海,陈丽,等. 苯乙烯的RAFT乳液聚合[J]. 中国科技论文在线精品论文,2012,5(7):654-660.
 
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