氯乙烯—丙烯酸丁酯共聚物热降解动力学的研究

Stndy on the Thermal Degradation Rinetics of a Sandom Copolymer of Vinyl Chlorde and Butyl Acrylat

本文是研究氯乙烯(VC)—丙烯酸丁酯(BA)共聚物的热降解动力学.考查了升温速率(β),气氛对热降解的影响.在氮气气氛中,共聚物(VC—BA)的热降解反应是吸热反应,降解反应分两步进行.第一步是脱除支基,反应级数(n)为1.2级,活化能(E)为113KJ/mol;第二步是主链断裂,反应级数(n)随升温速率(β)的增大而减小.在空气气氛中,共聚物(VC—BA)的热降解反应是放热反应,降解分三步进行(第三步未完成).第一步也是脱除支基,反应级数(n)为1.0级;活化能(E)为111.2KJ/moα,第二步亦是主链断裂,反应级数也随β增大而减小.

It has been stndied that the thermal degradation kinetics of a sandom copolymer of vinyl Chloride and Butyl acrylat (VC-BA). The effects of hote sates and atmospheres for the thermal degradation have been examied. the degradation scaction in N2 is andothermic but in air is exothermic. The degradation reaction in N2 engageies in two tepes: the first eliminate branch bases. the reactire order(n) is 1. 2. the active energy (E)is 113. 0 KJ · mol-1. The second is the mair chainbreak. In the air the reaction engageies in three tapts (The third is not finish) n=1. 0. E = 111. 2KJ · mol-1. The second is the chain break too.