氯化聚丙撑碳酸酯的结构与性能研究

二氧化碳与环氧丙烷的共聚产物-聚丙撑碳酸酯（PPC）已经进入到工业化生产阶段，但是由于其本身玻璃化转变温度通常在30~40℃，且呈无定形态，存在热稳定性差、低温脆性大等问题，大大限制了其应用范围。近期我们的研究工作表明氯化后的PPC表现出了与氯化前迥然不同的性能，其对金属、木材及极性较强的塑料如聚酯、聚氯乙烯等具有优良的浸润性和粘结性，可用于热熔胶、涂料等领域，也可作为增容剂有效提高PPC等与淀粉、天然纤维等合金材料的性能，进而大大拓宽PPC的应用领域。然而，人们对这一全新聚合物材料的结构及其与性能的关系还缺乏基本的认识。本项目针对以下科学问题，即（1）氯化PPC的分子结构及其与氯化工艺的关系；（2）氯化PPC的分子结构与玻璃化转变温度和力、热性能的关系；（3）氯化PPC的分子结构与浸润性、粘结性、成膜性、增容性的关系，开展基础研究，为氯化PPC的应用提供科学依据和技术支持。

At present, polypropylene carbonate (PPC), the copolymerization product of carbon dioxide and propylene oxide, have been put into the stage of industrial production. However, since it has a glass transition temperature (Tg) of commonly 30-40°C and is amorphous, there are defects such as large brittleness at low temperature, poor dimensional stability at high temperature, and the like, limiting its wide application. More recently, our research results show that the properties of the PPC after chloration become totally different from those of the PPC before chloration. The chlorinated PPC (CPPC) possess excellent wettability and adhesion with metal, wood, and polar polymers such as polycarbonate, polyvinyl chloride, et al, and can used as hot melt adhesive and coating materials. Moreover, as compatilizer, it can effectively improve the properties of the PPC composites with starch or nature fibers. However, we lack fundamental understanding for the molecular structure and the relation between the structure and properties of this new born material. In this project, we devote to study the following question: (1) the molecular structure of CPPC and its chloration process dependence; (2) the relation between the molecular structure of CPPC and its glass transition temperature, thermal and mechanical properties; (3) the relation between the molecular structure of CPPC and its wettability, adhesion, film formation as well as compatibilization. The purpose is to provide the scientific basis and technical support for the application of CPPC.