拉伸倍数对ePTFE结构和性能的影响
收稿日期: 2016-03-25
网络出版日期: 2017-12-30
基金资助
国家自然科学基金资助项目(51003209)
Effect of drawing ratio on structure and property of expanded polytetrafluoroethylene (ePTFE)
Received date: 2016-03-25
Online published: 2017-12-30
对聚四氟乙烯(polytetrafluoroethylene, PTFE)进行拉伸, 可以得到膨体聚四氟乙烯(expanded polytetrafluoroethylene, ePTFE). 探讨拉伸倍数对ePTFE结构和性能的影响. 结果表明: 随着拉伸倍数的增大, 簇状的晶体减少, 纤维逐渐增多, 微孔增多; 随着拉伸倍数的增大, ePT泊松比逐渐减小, 当拉伸倍数为10时, ePTFE的泊松比为−1.57, 在非等温结晶过程中, ePTFE的结晶焓变减小, 半结晶时间增大.
涂永辉1, 余若冰1, 杨雪2, 焦正3 . 拉伸倍数对ePTFE结构和性能的影响[J]. 上海大学学报(自然科学版), 2017 , 23(6) : 851 . DOI: 10.12066/j.issn.1007-2861.1802
Expanded polytetrafluoroethylene (ePTFE) can be obtained from polytetrafluoroethylene(PTFE) by drawing. Effect of the drawing ratio on the structure and properties of ePTFE was investigated. The following results were obtained. 1) With the increase of drawing ratio, the amount of tuft-like crystals was small, fibers increased and cavities rose in ePTFE. 2) When the drawing ratio was 10, the Poisson’s ratio was −1.57. As the drawing ratio increased, the Poisson’s ratio gradually depressed. 3) In anon-thermal crystallization process, as increasing drawing ratio, enthalpy of ePTFE decreased and semi-crystallization time became longer.
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