Citation: FU Tieyuan, MO Zhishen, HAN Ping, QI Yuchen, WU Shuyun, CHEN Donglin. STUDY ON FACTORS AFFECTING ROOM TEMPERATURE TRANSITION OF POLYTETRAFLUOROETHYLENE[J]. Chinese Journal of Polymer Science, ;1986, 4(2): 170-179. shu

STUDY ON FACTORS AFFECTING ROOM TEMPERATURE TRANSITION OF POLYTETRAFLUOROETHYLENE

Received Date: 15 May 1985

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.
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