复配稀土改性剂对MGF/PTFE复合材料性能的影响

采用稀土改性剂(RES)与硅烷偶联剂(PTMS)按不同组分配比对磨碎玻璃纤维(MGF)表面进行改性处理,将改性后的磨碎玻璃纤维粉末与聚四氟乙烯分散液机械混合,然后热压制得复合材料。探讨了复配稀土改性剂对MGF/PTFE复合材料介电性能、热膨胀系数(CTE)、热导率的影响。采用FTIR手段对稀土改性剂未改性的磨碎玻璃纤维和改性后的磨碎玻璃纤维的结构进行了测试,并用扫描电子显微镜(SEM)对复合材料的断口形貌进行分析。结果表明,复配改性剂能很好地促进MGF与PTFE之间的界面粘结,提高MGF/PTFE复合材料的性能。当RES、PTMS的含量分别为0.3%(质量分数)、1.7%(质量分数)时,MGF/PTFE复合材料的性能最好。

Effect of Compound Rare Earth Modifier on Properties of MGF/PTFE Composites

Rare earth modifier (RES) and phenyl trimethoxy silane (PTMS) were used for the surface treatment of milled glass fiber (MGF) with different ratios. The composites were prepared by modified milled glass fiber powder and PTFE aqueous dispersion with hot pressing method after mechanical mixture. The effect of mixing ratios of RES/PTMS components on the dielectric properties, coefficient of thermal expansion and heat conduction properties of MGF/PTFE composites were investigated. FTIR spectra of RES, unmodified and modified of MGF were tested, and then the fracture surfaces were analyzed by SEM. The experimental results showed that mixing ratios of RES/PTMS components could promoting interfacial adhesion between the glass fiber and PTFE. Which was an effective way in improving the properties of the composites. The optimal performance of the prepared MGF/PTFE with the mass fraction of RES and PTME of 0.3% and 1.7% respectively.