三嵌段共聚物PS-b-PI-b-PVBC的RAFT合成与表征  

Preparation and characterization of PS-b-PI-b-PVBC block copolymers based on reversible addition-fragmentation chain transfer polymerization

作　　者：叶妮雅[1] 杨长臻 宫希杰 曹勇[1] 李晓芳[1] 李海英[1] 雷良才[1] 

机构地区：[1]辽宁石油化工大学化学化工与环境学部,辽宁抚顺113001

出　　处：《应用化工》2015年第6期1016-1020,共5页Applied Chemical Industry

基　　金：国家自然科学基金资助项目(20974042)

摘　　要：采用可逆加成-断裂链转移自由基聚合法,以S-正十二烷基-S'-(α,α'-二甲基-α″-乙酸基)三硫代碳酸酯为链转移剂,偶氮二异丁腈为引发剂,合成窄分子量分布的聚苯乙烯大分子链转移剂(PS-CTA),在PS-CTA存在下,由引发剂依次引发异戊二烯(Ip)和对氯甲基苯乙烯(VBC)聚合,得到三嵌段聚合物PS-b-PI-b-PVBC。运用凝胶色谱、IR、原子力显微镜、1H NMR等技术对产物的结构进行表征。结果表明,所得嵌段共聚物分子量分布较窄(PDI=1.93),聚合过程具有活性/可控特征,聚合物薄膜在热退火后形成微观相分离,平均相区尺寸约为100 nm。Initiated by 2,2-azobisisobutyronitrile,styrene was polymerized via reversible addition-fragmentation chain transfer polymerization（ RAFT） at 70 ℃ in 1,4-dioxane in the presence of RAFT agent S-1-dodecyl-S＇-（ α,α＇-dimethyl-α″-acetic acid） trithiocarbonate（ DDMAT）. Then,the second monomer isoprene was polymerized by using PS-CTA（ synthesised in the first step） as a macromolecular RAFT agent.Finally the triblock polymer polystyrene-block-polyisoprene-block-polyvinylbenzyl chloride（ PS-b-PI-bPVBC） was prepared by the polymerization of VBC（ 4-vinylbenzyl chloride） where the PS-b-PI was served as the RAFT agent. The resulting products were characterized by GPC,IR,AFM,1H NMR. The results indicate that it is successful to prepare triblock copolymer with narrow molecular weight distribution（ PDI = 1. 93）,and the triblock copolymers in film can assemble into two phases with an average phasesize of 100 nm.

关 键 词：嵌段共聚物 RAFT聚合 聚苯乙烯 聚异戊二烯 聚对氯甲基苯乙烯 

分 类 号：TQ314.2[化学工程—高聚物工业]