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OALib Journal期刊
ISSN: 2333-9721
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SBS嵌段共聚物分子结构对其在溶液中链形态的影响
DOI: 10.3724/SP.J.1105.2011.09486, PP. 76-80
Keywords: 嵌段共聚物,分子结构,黏度法,激光光散射,链形态
Abstract:
线形两嵌段(SB)苯乙烯-丁二烯嵌段共聚物、线形三嵌段［(SB)2］和星形四臂三嵌段［(SB)4］的苯乙烯-丁二烯-苯乙烯(SBS)嵌段共聚物溶于四氢呋喃(THF)和环己烷(CH)中，通过黏度法获得它们的特性黏数并计算其黏度半径(Rη)；采用静态激光光散射法研究了它们在溶液中的第二维利系数和均方根旋转半径(Rg).由于Rη与其流体力学半径(Rh)具有相似性，所以表征链形态的特征参数ρ(=Rg/Rh)可通过上述两种方法获得.结果表明，(SB)4分子在良溶剂THF中表现出柔顺链构象，在CH中表现为实心球构象；(SB)2在THF和CH中均为空心球构象；两嵌段SB在THF和CH中均为柔顺链构象.
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