Preparation and Performance Enhancement of Silicon Dioxide/Polytetrafluoroethylene Composite Films by Emulsion Molding
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(SiO2)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 SiO2/PTFE composite film(80 μm)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/SiO2 and preparing PTFE composite film materials.
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