【摘要】 研究了以双硫酯为链转移剂进行的均聚和嵌段共聚物的合成。首先合成大分子链转移剂 ,得到分子量可控、多分散性系数 ( PDI)较小 ( <1 .30 )的均聚物。用末端带有双硫酯基团的 PSt,PBMA和 PBA为链转移剂 ,加入第二单体聚合得到分子量可控、且 PDI较小的两嵌段聚合物。嵌段聚合时必须加入微量的自由基引发剂以形成大分子自由基 ,达到较好的控制聚合效果。更多还原

【Abstract】 The synthesis of homopolymers and diblock copolymers by adding dithioester as chain transfer agent were performed. A series of monomers were polymerized by Reversible Addition-Fragmentation Chain Transfer(RAFT) polymerization. All of these homopolymers have the controlled polymerization characteristics, PDI is narrow(1.08~1.30). The effect of the molar ratio of chain transfer agent to initiator on polymerization was discussed. The diblock copolymers were gotten by addition of the secong monomer. These copolymers have the characteristics of the controlled/living radical polymerization.更多还原