以季戊四醇为核的多臂星形链转移剂的合成及表征  

Synthesis and Characterization of Multi-Arms Star Chain Transfer Agent with Pentaerythritol as Core

作　　者：陈卫星[1] 范晓东[1] 刘郁杨[1] 孙乐[1] 

机构地区：[1]西北工业大学理学院应用化学系,陕西西安710072

出　　处：《高分子材料科学与工程》2008年第9期56-59,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(20674060)

摘　　要：设计合成了以季戊四醇为核的多臂星形链转移剂——PTDBA,以AIBN为引发剂,St、MMA为单体,在80℃下进行RAFT自由基聚合,分别得到大分子链转移剂PS-CTA与PMMA-CTA。用FT-IR和1H-NMR1、3C-NMR表征了两种大分子链转移剂的结构;用SEC/MALLS测定了两种聚合物的分子量及分子量分布,发现在阻滞期后大分子的分子量随单体转化率的增加呈线性增加。再以PS-CTA为大分子链转移剂,DMAEMA为第二单体进行扩链反应。并用FT-IR和1H-NMR1、3C-NMR对所合成的产物进行了表征,结果表明,大分子链转移剂具有扩链作用。A novel chain transfer agent-PTDBA was designed, synthesized and characterized. By using PTDBA as chain transfer agent, AIBN as initiator, styrene and methyl methacrylate as monomers, multi-arms star polymers （PS-CTA, PMMA-CTA） which can be used as macro chain transfer agent were synthesized via RAFT polymerization at 80 ℃. The polymer＇s chemical structures were confirmed by means of FT-IR, NMR, and the molecular weight and its polydistribution were characterized by SEC/MALLS. It is found that the relationships of the ln[M0]/[M] vs. reaction time and molecular weight vs. conversion show linear after passing retardation period. A multi-arms block copolymer was also synthesized via RAFT polymerization in which DMAEMA is the second monomer. Its chemical structure was verified by FT-IR, ^1H-NMR and ^13C-NMR. The results indicate that the PS-CTA has the chain extending effect.

关 键 词：链转移剂 可逆加成断裂链转移自由基聚合 活性聚合 星形共聚物 嵌段共聚物 

分 类 号：TQ314.254[化学工程—高聚物工业]