Micro-structure of diblock copolymers with a crystalline polymer chain

本文研究了以聚己内酯（PCL）为结晶组分的聚合物共混物和含结晶组分的嵌段共聚物的微观结构。本研究的主要成果如下：1.聚己内酯与聚氯乙烯相容共混物中球晶结构的研究。用光学显微镜观察了聚己内酯（PCL）与聚氯乙烯（PVC）共混物中PCL的球晶结构。消光环等结构强烈依赖于共混物中PCL的组成。单轴取向尼龙6在混合溶剂中的溶胀平衡和超结构。采用小角X射线散射（SAXS）技术研究了溶剂溶胀对尼龙6超结构的影响。有人发现，溶剂分子在结晶区的非晶层的干预是负责的超结构的变化-尼龙6。本研究对位置灵敏正比计数器（PSPC）和SAXS强度校正程序的有效性进行了检验. PCL与聚苯乙烯（PS）之间的相互作用参数。由PCL/PS共混物的SAXS强度估算了PCL与PS之间的相互作用参数。发现该体系的相互作用参数与广泛研究的聚合物共混体系如PS/聚丁二烯和PS/聚异戊二烯的相互作用参数相当. PCL/PS二嵌段共聚物的形态。用小角X射线散射（SAXS）技术研究了PCL/PS两嵌段共聚物的形态结构。小角X射线散射强度峰主要由PCL结晶产生，表明结晶驱动力远大于微相分离驱动力。

The micro-structures of polymer blends and of diblock copolymers with a crystalline component are studied in the present research, in which poly( -caprolactone) (PCL) is mainly used as the crystalline component. The results of the research can be summarized as follows:1. The spherulite structure in compatible mixture of PCL and poly(vinyl chloride)(PVC). The spherulite structure of PCL in the blend of PCL and PVC was observed by an optical microscope. The structure such as the extinction ring is strongly dependent on the PCL composition in the blend.2. Swelling equilibrium and super-structure of uniaxially oriented -Nylon 6 in solvent mixtures. A small angle X-ray scattering (SAXS) technique was used to investigate the change in the super-structure of -Nylon 6 by the swelling of the solvent. It was found that the intervention of the solvent molecules in the amorphous layer of the crystalline region is responsible for the change in the super-structure of -Nylon 6. In this study, the validity of the position sensitive proportional counter (PSPC) and the programs for the SAXS intensity corrections were checked.3. The interaction parameter between PCL and polystyrene (PS). The interaction parameter between PCL and PS was estimated from the SAXS intensity of PCL/PS blends. It was found that the interaction parameter of this system is comparable to that of polymer blend systems widely investigated such as PS/polybutadiene and PS/polyisoprene.4. Morphology of PCL/PS diblock copolymer. The morphology formed in the PCL/PS diblock copolymer was investigated by SAXS technique. The SAXS intensity peak arising from the crystallization of PCL was dominately observed, indicating that the driving force of the crystallization is much larger than that of the micro-phase separation.