STUDY ON FACTORS AFFECTING ROOM TEMPERATURE TRANSITION OF POLYTETRAFLUOROETHYLENE

FU Tieyuan; MO Zhishen; HAN Ping; QI Yuchen; WU Shuyun; CHEN Donglin

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STUDY ON FACTORS AFFECTING ROOM TEMPERATURE TRANSITION OF POLYTETRAFLUOROETHYLENE

Papers | Updated：2021-06-21

- STUDY ON FACTORS AFFECTING ROOM TEMPERATURE TRANSITION OF POLYTETRAFLUOROETHYLENE
- Vol. 4, Issue 2, Pages: 170-179(1986)
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- Published：20 June 1986
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FU Tieyuan, MO Zhishen, HAN Ping, et al. STUDY ON FACTORS AFFECTING ROOM TEMPERATURE TRANSITION OF POLYTETRAFLUOROETHYLENE[J]. 1986, 4(2): 170-179.
DOI：

FU Tieyuan, MO Zhishen, HAN Ping, et al. STUDY ON FACTORS AFFECTING ROOM TEMPERATURE TRANSITION OF POLYTETRAFLUOROETHYLENE[J]. 1986, 4(2): 170-179. DOI：

摘要

In the X-ray diffiaction intensity distribution diagram of PTFE

three diffraction peaks exist inthe range of Bragg angle 30--45°

which are very sensitive to the Crystal trausition at room temperature.At 15℃

the crystal is triclinic and the "small spikes" along with the main peaks appear on the dif-fraction scans due to the distortion of the unit cell

while at 23℃

distortion no longer exists

"smallspikes" disappear completely. When the temperature is raised to 34℃

the hexagonal crystal fur-ther randomizes and the peak at Bragg angle 42°vanishes.We assigned correctly Miller index(108)to this peak and used 2θ=30-45℃ region("sensitive region") as a criterion to characterize qualitatively the crystal transition.It has been found that some factors such as γ-irradiation

cold pressing

drawing

calendering and copolymerization which are usually encountered in the fabrication or application of PTFE articles have profound effect on the crystal transition as evidenced by X-ray diffraction patterns and DSC thermograms.The information obtained in the present work is beneficial to the use of PTFE articles.

Abstract

In the X-ray diffiaction intensity distribution diagram of PTFE

three diffraction peaks exist inthe range of Bragg angle 30--45°

which are very sensitive to the Crystal trausition at room temperature.At 15℃

the crystal is triclinic and the "small spikes" along with the main peaks appear on the dif-fraction scans due to the distortion of the unit cell

while at 23℃

distortion no longer exists

"smallspikes" disappear completely. When the temperature is raised to 34℃

cold pressing

drawing

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