聚苯醚改性高固含量热塑性PF的制备与性能研究

Study on preparation and properties of thermoplastic PF with high solid content modified by PPO

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%。

A thermoplastic PF （phenol formaldehyde resin） with high solid content （〉85%） and thermoplastic PF with high solid content modified by PPO（polyphenylene oxide） were synthesized. The structure,curing reaction and thermal degradation process of thermoplastic PF unmodified and modified by PPO were analysed by Fourier transform infrared spectroscopy （FT-IR）, differential scanning calorimetry （DSC） and thermogravimetry （TGA）. And both mechanics properties of composites reinforced by glass fiber were investigated. The results showed that the PPO＇s introduction,not only increases the curing reaction activity of PF,but also improves the heat resistance of PF. The PPO modified thermoplastic PF-based composite reinforced by glass fiber could effectively improve mechanics properties because its tensile strength,shear strength and bend strength were increased by 17.8% 73.0% and 21.4% ,respectively.