乳液成型制备二氧化硅/聚四氟乙烯复合薄膜及其性能优化  

Preparation and Performance Enhancement of Silicon Dioxide/Polytetrafluoroethylene Composite Films by Emulsion Molding

作　　者：高炜 周茜[1] 沈佳斌[1] 陈蓉[1] 郭少云[1] Wei Gao;Qian Zhou;Jiabin Shen;Rong Chen;Shaoyun Guo(State Key Laboratory of Polymer Materials Engineering(Sichuan Universty),Polymer Research Institute of Sichuan University,Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing Technology,Chengdu 610065,China)

机构地区：[1]高分子材料工程国家重点实验室(四川大学)四川大学高分子研究所四川省橡塑材料复合成型技术工程实验室,四川成都610065

出　　处：《高分子材料科学与工程》2024年第8期107-114,共8页Polymer Materials Science & Engineering

基　　金：四川省自然科学基金面上项目(2022NSFSC0357);四川省杰出青年科技人才项目(2022JDJQ0023)。

摘　　要：聚四氟乙烯(PTFE)由于优异的介电性能已成为高频通讯的重要载体,通常将其与无机填料复配以提高其力学性能。但是,受限于PTFE极低的表面能,无机填料与其界面作用极差,难以在传统车削或压延成膜的强应力作用下实现高填充复合薄膜材料的成型。因此文中尝试以尺寸更小,界面可灵活构筑的PTFE乳液为基体、二氧化硅(SiO_(2))为无机填料,通过SiO_(2)表面改性对SiO_(2)/PTFE复合膜材料性能强化,研究无机粒子表面改性对复合材料分散、界面及力学性能等的影响。研究发现,当偶联剂质量分数为5%时,SiO_(2)/PTFE复合薄膜(80μm)力学性能最优,拉伸强度由SiO_(2)改性前的4.35 MPa增加至5.33 MPa、断裂伸长率由38.2%增加至134.0%。为提高PTFE/SiO_(2)界面强度、制备高性能PTFE复合薄膜材料提供了新方法。Polytetrafluoroethylene(PTFE)has become an important carrier for high frequency communication due to its excellent dielectric properties,and is usually compounded with inorganic fillers to improve its mechanical properties.However,due to the extremely low surface energy of PTFE itself,the interface between inorganic fillers and PTFE is extremely poor,and it is difficult to achieve the molding of high-filled composite film materials through traditional turning or calendering.Therefore,this study attempted to use PTFE emulsion with smaller size and flexible interface as matrix,and silicon dioxide(SiO_(2))as inorganic fillers to study the effect of surface modification of inorganic particles on the dispersion,interface and mechanical properties of the composites.It is found that when the mass fraction of coupling agent is 5%,the mechanical properties of SiO_(2)/PTFE composite film(80μm)are the best,the tensile strength increases from 4.35 MPa to 5.33 MPa,and the elongation at break increases from 38.2%to 134.0%.This study provided a new method for improving the interfacial strength of PTFE/SiO_(2) and preparing PTFE composite film materials.

关 键 词：聚四氟乙烯 二氧化硅 硅烷偶联剂 力学性能 

分 类 号：TB383[一般工业技术—材料科学与工程]