Effect of Stretching Process on Structure and Properties of Polytetrafluoroethylene

doi:10.19491/j.issn.1001-9278.2020.01.001

Abstract

Abstract: A series of polytetrafluoroethylene (PTFE) drawn samples were prepared by uniaxial stretching at different stretching temperatures, rates and lengths, and the effects of stretching process on the structure and properties of the drawn samples were investigated systematically. The results indicated that the density and porosity of the drawn samples were effectively reduced by increasing the stretching temperature, rate and length, and their mechanical properties varied obviously with an increase of stretching length. The tensile strength increased from 28.72 MPa to 46.13 MPa, but the elongation at break decreased from 145 % to 85 %. Moreover, the compression rate of the drawn samples increased from 6.17 % to 16.21 % at different stretching lengths, whereas the elastic recovery rate increased from 3.90 % to 6.42 %, indicating that the obtained drawn samples are more suitable for use as sealing materials.

References

[1]郝新敏, 杨元, 黄斌香.聚四氟乙烯微孔膜及纤维[M]. 化学工业出版社, 2011：3-5. [2]膨体聚四氟乙烯（ePTFE）密封材料的力学行为与密封性能研究[D].华东理工大学, 2014. [3]徐红星, 袁新华, 程晓农, 等.碳纤维玻璃纤维石墨协同改性复合材料力学性能[J].润滑与密封, 2007, 32(9):88-90 [4]XU H X，YUAN X H，CHENG X N，et al.Mechanical Properties of Carbon FiberGlass FiberGraphite Synergistically Modified PTFE Composites[J].Lubrication Engineering, 2007, 32(9):88-90 [5]李奔, 朱光明, 李素琴.膨体聚四氟乙烯的制备及应用[J].中国塑料, 2019, 33(02):142-147 [6]LI B, ZHU G M, LI S Q.Preparation and Application of Expanded Polytetrafluoroethylene[J].China Plastics, 2019, 33(02):142-147 [7]田普锋, 寇开昌, 丁美平, 等.聚四氟乙烯拉伸微孔膜的制备[J].化工新型材料, 2005, 33(12):81-83 [8]TIAN P F, KOU K C, DING M P, et al.Preparation of Polytetrafluoroethylene Tensile Microporous Membrane[J].New Chemical Materials, 2005, 33(12):81-83 [9]郝新敏, 张建春, 郭玉海, 等.拉伸工艺对膨体薄膜微孔结构的影响[J].膜科学与技术, 2005, 25(4):26-29 [10]HAO X M, ZHANG J C, GUO Y H, et al.Effect of Stretching Process on Microporous Structure of Expanded PTFE Film[J].Membrane Science and Technology, 2005, 25(4):26-29 [11]周宏成.双向拉伸速率对聚四氟乙烯微孔膜结构的影响[C]// 全国袋式除尘技术研讨会论文集. Ｃ］／／全国袋式除尘技术研讨会论文集.江苏：中国环境保护产业协会袋式除尘委员会 2015.303-305. [12]张冬娜, 寇开昌, 张宇, 等.拉伸处理对聚四氟乙烯性能的影响[J].航空材料学报, 2013, 33(6):57-61 [13]ZHANG D N, KOU K C, ZHANG Y, et al.Effect of Tensile Treatment on Properties of Polytetrafluoroethylene[J].Journal of Aeronautical Materials, 2013, 33(6):57-61 [14]王永军, 郭玉海, 张华鹏.薄膜的横向非均匀拉伸行为[J].高分子材料科学与工程, 2008, 24(12):141-144 [15]WANG Y J, GUO Y H, ZHANG H P.Transverse Non-uniform Tensile Behavior of PTFE Films[J].Polymer Science and Engineering, 2008, 24(12):141-144 [16]郭玉海, 张华鹏, 王永军.薄膜横向拉伸变形行为及其有限元分析[J].化工学报, 2008, 59(5):1315-1319 [17]GUO Y H, ZHANG H P, WANG Y J.Transverse tensile deformation behavior and finite element analysis of PTFE films[J].CIESC Journal, 2008, 59(5):1315-1319 [18]王永军.聚四氟乙烯微孔薄膜的拉伸形变机制及均匀性研究[D]. 浙江理工大学, 2008. [19]吴明儿, 戴璐, 慕仝.ePTFE膜材力学性能试验研究[J]. [J].建筑材料学报, 2010, 13(5):632-635 [20]WU M E, DAI L, MU T.Experimental Study on Mechanical Properties of ePTFE Membrane[J]. [J]. Journal of Building Materials, 2010, 13(5):632-635 [21]张雨果.膨体聚四氟乙烯（ePTFE）密封材料的力学行为与密封性能研究[D]. 华东理工大学, 2014. [22]谢苏江, 蔡仁良.压缩非石棉纤维橡胶垫片密封材料性能研究的进展[J].化工设备与管道, 2003, 40(5):5-11 [23]XIE S J, CAI R L.Progress in Research on Properties of Compressed Non-Asbestos Fiber Rubber Gasket Sealing Materials[J].Chemical Equipment and Pipeline, 2003, 40(5):5-11 [24]谢琼春.聚四氟乙烯中空纤维膜的制备及其工艺的探究[D].浙江理工大学，2016.