704胶胶结界面pH值对玻璃纤维复合铝箔动态模量的影响

采用均匀设计法,以盐酸和氢氧化钠为酸碱处理剂,制备pH值在1.90~13.70的玻璃纤维与铝箔表面。以704硅橡胶作为粘结剂,将处理过的玻璃纤维与铝箔在140℃热压60s制成玻璃纤维复合铝箔材料。用动态热机械性能测试仪(DMA)考察胶结界面pH值在30~400℃下,玻璃纤维复合铝箔动态模量随温度的变化情况。结果表明:当玻璃纤维界面pH值呈中性,铝箔界面pH值呈弱碱性时,复合材料的动态模量比其他胶结界面pH值都大;且随着温度的增加,其动态模量相应增加,并在200℃时达到最大值。扫描电镜(SEM)实验证明,在此条件下制备的复合材料胶结界面更为紧密,且玻璃纤维丝有部分嵌入铝箔表面层结构。

Effects of pH Value of 704 Adhesive Interface on the Dynamic Modulus of Glass Fiber Composite Aluminum Foil

Using uniform design method,hydrochloric acid and sodium hydroxide were adopted as the acid and alkali treatment to prepare the surfaces of aluminum foil and glass fibers by changing the pH within 1.90-13.70.The treated glass fiber and aluminum foil were hot pressed for 60s at 140℃ to obtain the glass fiber composite aluminum foil,and then adhered by 704 silicone rubber.Dynamic thermomechanical analysis (DMA) was used to study the effects of the pH of bonding interface on the dynamic modulus of the composite under different temperature (30～400℃).The results showed that the dynamic modulus of the composite is the best when the glass fiber interfacial pH is neutral and the aluminum foil interfacial pH is weak alkaline;and with the increase of temperature,the dynamic modulus increased and reached the maximum in 200℃,The scanning electron microscopy (SEM) results showed that the bonding interface of the composite was denser under this preparation conditions,and some glass fiber was embedded in the surface layer of the aluminum foil.