THERMAL-DEGRADATION OF POLYTETRAFLUOROETHYLENE IN FLOWING HELIUM ATMOSPHERE .1. DEGRADATION RATE

被引：4

作者：

JUN, HS ^{[1
]}

KIM, KN ^{[1
]}

PARK, KY ^{[1
]}

WOO, SI ^{[1
]}

机构：

[1] KOREA ADV INST SCI & TECHNOL,DEPT CHEM ENGN,TAEJON 305701,SOUTH KOREA

来源：

KOREAN JOURNAL OF CHEMICAL ENGINEERING | 1995年 / 12卷 / 02期

关键词：

POLYTETRAFLUOROETHYLENE; THERMAL DEGRADATION; DIFFUSION EFFECT; RATE; ACTIVATION ENERGY;

D O I：

10.1007/BF02705640

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The thermal degradation of polytetrafluoroethylene in flowing helium atmosphere was studied in the temperature range 510-600 degrees C. The products of thermal degradation were analyzed by an on-line gas chromatography and the rates of degradation were obtained. At relatively lower temperatures (less than 530 degrees C) the rate curves as a function of time showed two peaks. This phenomenon was explained in terms of diffusion limitation of the gaseous products. Further research was carried out by scanning electron microscopy (SEM) in order to observe the diffusion limitation and these facts were confirmed by observing the matrix of partially degraded polymer, The rate curves which have two peaks indicated that the diffusion limitation was disappeared above ca. 50% conversion. The activation energy in diffusion limitation free region was 78.1 kcal/mole and it was very similar to the result obtained by Madorsky (80.5 kcal/mole). The activation energy was also consistent with that obtained by thermogravimetry.

引用

页码：156 / 161

页数：6

共 13 条

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