Synthesis of Symmetrical Triblock Copolymers of Styrene and N‐isopropylacrylamide Using Bifunctional Bis(trithiocarbonate)s as RAFT Agents
Synthesis of Symmetrical Triblock Copolymers of Styrene and N‐isopropylacrylamide Using Bifunctional Bis(trithiocarbonate)s as RAFT Agents
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DOI：
10.1002/macp.200800575
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发表时间：
2009-04
影响因子：
2.5
通讯作者：
A. M. Bivigou-Koumba;J. Kristen;A. Laschewsky;P. Müller‐Buschbaum;C. Papadakis
中科院分区：
文献类型：
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作者：
A. M. Bivigou-Koumba;J. Kristen;A. Laschewsky;P. Müller‐Buschbaum;C. Papadakis
以n -异丙基丙烯酰胺为亲水性“A”嵌段，苯乙烯为疏水性“B”嵌段，探索了6种新型双官能团双硫代碳酸酯为RAFT试剂，用于合成两亲性三嵌段共聚物ABA和BAB。聚苯乙烯对n -异丙基丙烯酰胺的延伸作用不明显，而聚苯乙烯高分子聚合剂能有效地提供嵌段共聚物。1h NMR端基分析支持了摩尔质量分析，并揭示了某些双（三硫代碳酸酯）s的意外副反应，即在挤压乙烯-三硫代碳酸酯时裂解成简单的三硫代碳酸酯。具有短聚苯乙烯嵌段的两亲性嵌段共聚物可直接溶于水，并自组织成热响应的胶束聚集体。
Six new bifunctional bis(trithiocarbonate)s were explored as RAFT agents for synthesizing amphiphilic triblock copolymers ABA and BAB, with hydrophilic "A" blocks made from N-isopropylacrylamide and hydrophobic "B" blocks made from styrene. Whereas the extension of poly(N-isopropylacrylamide) by styrene was not effective, polystyrene macroRAFT agents provided the block copolymers efficiently. End group analysis by 1 H NMR spectroscopy supported molar mass analysis and revealed an unexpected side reaction for certain bis(trithiocarbonate)s, namely a fragmentation to simple trithiocarbonates while extruding ethylene-trithiocarbonate. The amphiphilic block copolymers with short polystyrene blocks are directly soluble in water and self-organize into thermo-responsive micellar aggregates.