摘要
线形两嵌段(SB)、线形三嵌段[(SB)2]和星形四臂三嵌段[(SB)4]的苯乙烯-丁二烯嵌段共聚物(SBS)溶于选择性溶剂丁酮后的聚集自组装行为差异极大。粘度测定和透射电镜观察结果表明,在溶液中,(SB)4由其内部聚丁二烯嵌段(PBD)聚集自组装成单分子核-壳结构;(SB)2在低于转折浓度时由多个分子的PBD聚集自组装成开放式核-壳结构,在高于转折浓度时则成为稳定聚集体;而SB自组装成为宏观不溶的特大胶体微粒。
Great difference in self-assembly has been found when linear diblock （SB）,linear triblock [（SB）2] and four-arm star-shaped triblock [（SB）4] poly（styrene-block-butadiene） copolymers dissolved in selective solvent methyl ethyl ketone.Viscosity measurement and TEM observation show that,single-molecular aggregates formed with the inner polybutadiene blocks of （SB）4 self-assembled together while outer polystyrene blocks stretched out;open-style core-shell structures of （SB）2 were observed when the polymer concentration was below the critical concentration,while stable aggregates could be formed when concentration over the critical concentration;SB self-assembled into giant aggregates to form swelled colloidal particles.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2010年第7期1265-1267,共3页
Journal of Functional Materials
基金
国家自然科学基金资助项目(20844006)
关键词
嵌段共聚物
分子结构
自组装
聚集
选择性溶剂
block coploymer
molecular architecture
self-assembly
aggregation
selective solvent
