Well-defined vinyl ketone-based polymers by reversible addition-fragmentation chain transfer polymerization
Well-defined vinyl ketone-based polymers by reversible addition-fragmentation chain transfer polymerization
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DOI：
10.1021/ja073541y
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发表时间：
2007-08-22
影响因子：
15
通讯作者：
Wooley, Karen L.
中科院分区：
文献类型：
--
作者：
Cheng, Chong;Sun, Guorong;Wooley, Karen L.
以(S)-1-十二基-(S‘)-(α，α’-二甲基-α‘-乙酸乙酯)为RAFT试剂，异丁腈为引发剂，在70-75℃的2-丁酮或1，4-二氧六环中进行RAFT均聚合，合成了具有良好光降解性能的聚乙烯酮-S。聚合物的M-n值和单体向聚合物的转化率的良好线性一致性验证了RAFT过程的活性特征。通过随后的RAFT聚合，这些聚乙烯酮S进一步扩链，得到了定义良好的嵌段共聚物。通过AFM表征证实，基于光降解聚乙烯酮嵌段的两嵌段共聚物制备了纳米结构薄膜。
Well-defined photodegradable poly(vinyl ketone)s with predictable molecular weights and low polydispersities (PDI = 1.16-1.21) were synthesized by RAFT homopolymerizations of vinyl ketone monomers using (S)-1-dodecyl-(S')-(alpha,alpha'-dimethyl-alpha' '-acetic acid)trithiocarbonate as the RAFT agent and AIBN as the initiator at 70-75 degrees C in 2-butanone or 1,4-dioxane. The living characteristics of the RAFT processes were verified by excellent linearity agreement of polymer M-n values and monomer conversions to polymer. Further chain extension from these poly(vinyl ketone)s by subsequent RAFT polymerizations provided well-defined block copolymers. Confirmed by AFM characterization, a nanostructured film was prepared from a resulting diblock copolymer based on photodegradation of its poly(vinyl ketone) blocks.