氯乙烯——丙烯酸丁酯共聚物热解机理的研究

本文用TG—DSC法研究氯乙烯(VC)—丙烯酸丁酯(BA)共聚物的热降解机理.考查了升温连率(β)、气氛对热降解的影响.实验表明;随β值增大、VC—BA共聚物的热降解出现最大降解速率时的温度(T_p)和降解10%时的温度(T_0.1)都升高,但对最终降解率影响不大;在气氛一定时,T_P时的降解率是一个常数.在氮气气氛中的T_P比空气气氛中的T_P高,且VC—BA共聚物的热降解反应是吸热反应,它的降解分两步进行,第一步是脱除支基,第二步是主链断裂;在空气气氛中,VC—BA的热降解是放热反应,降解分三步进行(第三步有待完成),第一步也是脱除支基,第二步也是主链断裂.

Stndy on the thermal degradation process of a samdom Copolymer of ringl chloride and butyl acrylat

It has been stndied that the thermal drgradation process of a sandom copoly-mer of vingl Chlorde and Butyl acrylat. The effects of hote Sates and atomspheres for the thermal degradation hare teen examied. When the hote rates rise the temperatures of the degratation peak(Tp) and 10% (T0.1) go up. but the effect for of the fmal ratiu of the degradation is not seriows. When the atomsphere is fixed, the degradation ratio on Tp is a constant. The Tp is nitrogen is higher than the Tp in air. the degradation scaction in N2 is andothermic but in air is exothermic, the degradation reaction in N2 engageies in two tapes the first eliminate the bramch bases. The second is the main chain break. In the air the reaction engageies in there tapes (The third is not fimish).