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合成了高固含量(>85%)的线性PF(酚醛树脂)和聚苯醚(PPO)改性高固含量线性PF。采用红外光谱(FT-IR)法、差示扫描量热(DSC)法和热重分析(TGA)法等,分析了PPO改性前后线性PF的结构、固化反应和热降解过程,并对两者的玻璃纤维增强复合材料的力学性能进行了研究。结果表明:PPO的引入,既增强了PF的固化反应活性,又提高了PF的耐热性能;PPO改性线性PF基玻璃纤维增强复合材料的力学性能得到了有效提升,其拉伸强度、剪切强度和弯曲强度分别提高了17.8%、73.0%和21.4%。
Linear PF (phenolic) and polyphenylene oxide (PPO) modified high solids linear PF were synthesized at high solids (> 85%). The structure, curing reaction and thermal degradation of linear PF before and after PPO modification were analyzed by means of FT-IR, DSC and TGA, The mechanical properties of glass fiber reinforced composites were studied. The results show that the introduction of PPO not only enhances the curing reaction activity of PF, but also improves the heat resistance of PF. The mechanical properties of PPO modified linear PF-based glass fiber reinforced composites have been effectively improved. The tensile strength, shear strength The shear strength and flexural strength increased by 17.8%, 73.0% and 21.4% respectively.