60PHB/PET共聚酯的固相缩聚反应动力学研究  

A STUDY OF THE KINETICS OF SOLID STATE POLYCONDENSATION FOR 60PHB/PET COPOLYESTER

作　　者：章忠华 陈稀[2] 屈凤珍 梁伯润[2] 

机构地区：[1]上海纺织高等专科学校纺化系 [2]中国纺织大学高分子材料与工程系化学纤维教研室

出　　处：《中国纺织大学学报》1995年第3期40-45,共6页Journal of China Textile University

基　　金：国家自然科学基金项目

摘　　要：本文研究了摩尔比为60:40的对羟基苯甲酸和PET的热致性液晶共聚酯(60PHB/PET)的固相缩聚动力学,建立了反应动力学模型,求出反应活化能E为89.6kJ/mol;探讨了在不同温度区域影响60PHB/PET共聚酯固相缩聚反应速度的主要影响因素,认为在较低反应温度(180—220℃),反应速度主要由化学反应速度控制;在较高反应温度(220—230℃)则由小分子扩散速度控制。因此,共聚酯经溶解沉淀处理再进行固相缩聚可提高反应速度。The kinetics of the Solid State polycondensation(SSP) for 60PHB / PETcopolyester as a thermotropic liquid crystal is studied in this paper. A kinetic model for SSP has been established. The activation energy of SSP obtained is 89.66 KJ/mol. The main factors affecting the rate of SSP are studied. It is found that the rate of SSP is controlled mainly by the rate of chemical reaction rate of 60PHB / PET at moderately low temperature range (for example 180-210℃) and by the diffusion rate of small molecules at higher temperature range (for example 220-230℃). Therefore, repreciptating the copolyester can assist in raise of the reaction rate prior to the SSP being carried out.

关 键 词：反应动力学 共聚物 固相缩聚 液晶 共聚酯 塑料 

分 类 号：TQ323.402[化学工程—合成树脂塑料工业]