聚四氟乙烯热解新动力学方程  

New Kinetic Equation for Polytetrafluoroethylene Pyrolysis

作　　者：朱璟[1] 汪宝和[1] 张德立[1] 袁继堂[1] 

机构地区：[1]天津大学石化中心,天津300072

出　　处：《化工生产与技术》2008年第5期7-9,共3页Chemical Production and Technology

摘　　要：针对平均粒度为300μm的聚四氟乙烯颗粒、温度在520～560℃的范围,提出了PTFE热分解新的速率方程为r=k0(tanh(a+b))(exp(-E/RT))(1-Δm/m0)。新方程考虑了试样尺寸对热解速率的影响,改进了已有速率方程完全不考虑扩散阻滞和逆向解聚作用,或完全不考虑样品内部热解反应的2种极端倾向。新速率方程在理论上更为合理,与实验数据更为吻合。A new kinetic equation of polytetrafluoroethylene pyrolysis has been put forward for average particles of 300μm and at the temperature range of 520~560 ℃,which is r=k0 (tanh (a+b)) (exp (-E/RT)) (1-Δm/m0). The influence of particle size on pyrolysis rate has been considered in the new kinetic equation,and the two extreme conditions of the old equations have been overcomed,one does not consider diffuse retardation and reverse polymerizion,the other does not consider all the inner pyrolysis reaction. The new equation is more reasonable theoretically and better fitting with experimental data.

关 键 词：聚四氟乙烯 热解 扩散阻滞 逆向聚合 动力学方程 

分 类 号：TQ325.4[化学工程—合成树脂塑料工业]