CAJ | 학술논문

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、1 H 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。
채용가역가성-단렬련전이자유기취합법，이S-정십이완기-S′-(α，α′-이갑기-α″-을산기)삼류대탄산지위련전이제，우담이이정정위인발제，합성착분자량분포적취분을희대분자련전이제( PS-CTA)，재PS-CTA존재하，유인발제의차인발이무이희( Ip)화대록갑기분을희( VBC)취합，득도삼감단취합물PS-b-PI-b-PVBC。운용응효색보、IR、원자력현미경、1 H NMR등기술대산물적결구진행표정。결과표명，소득감단공취물분자량분포교착( PDI=1.93)，취합과정구유활성/가공특정，취합물박막재열퇴화후형성미관상분리，평균상구척촌약위100 nm。
Initiated by 2,2-azobisisobutyronitrile,styrene was polymerized via reversible addition-fragmen-tation 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 iso-prene 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-b-PVBC) 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,1 H NMR. The re-sults 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 phase-size of 100 nm.