苯乙烯-氧乙烯-苯乙烯三嵌段聚合物的受限结晶行为的反气相色谱分析

Analysis of Confined Crystalline Behaviors of Poly(styrene)-Poly(ethyleneoxide)-Poly(styrene) Triblock Copolymers by Inverse Gas Chromatography

采用反气相色谱法研究了苯乙烯 氧乙烯 苯乙烯三嵌段结晶聚合物 (PS PEO PS)的结晶熔融相变 ,测定了PS PEO PS的结晶度、熔点以及熔程 ,探讨了正构烷烃探针分子的碳链长度对测定结果的影响。研究结果表明 :PS PEO PS的微相分离对PEO链段的结晶行为有较大的影响 ,其晶体结构中存在由多种不完善PEO结晶和PS非结晶构成的中间层 ;正构烷烃探针分子的碳链长度对测定PS PEO PS的熔点和熔程无影响 ,但对结晶度测定和PEO结晶熔融相变的检测影响较大 ,所测得PS PEO PS的结晶度随正构烷烃探针分子碳链的增长而降低 ,合适的短链正构烷烃探针分子能真实反映中间层的存在以及中间层中不完整PEO结晶的多重熔融相变。

The confined crystalline behaviors of the triblock copolymers, poly(styrene) poly(ethylene oxide) poly(styrene)(PS PEO PS), were studied by using inverse gas chromatography(IGC) probe technique, including phase transformation of melting crystalline, crystallinity( X c), melting temperature( T m) and melting range of temperature The effects of the molecule chain length of linear alkane probes on the results are discussed Results showed that micro phase separation of PS PEO PS had a greater influence on crystallization of PEO molecule chain. Crystalline structure of PS PEO PS had interphase formed by some kinds of imperfect PEO crystal and amorphous PS The molecule chain length of linear alkane probes had no effect on the determination of melting temperature and melting range of temperature of PS PEO PS, but had a greater influence on the determination of crystallinity of PS PEO PS and investigation phase transformation of melting crystalline Crystallinity of PS PEO PS determined by IGC was decreased with the increase of molecule chain length of linear alkane probes By suitable shorter molecule chain length of linear alkane probes, it was truer to reflect the existence of interphase of PS PEO PS and multi phase transformation of melting crystalline presenting in interphase