有机硅改性酚醛树脂合成及应用性能

以苯酚、甲醛为原料,在碱性条件下合成常规的热固性酚醛树脂,同时以聚甲基苯基硅氧烷(PMPS)为改性剂,在相同的工艺条件下合成一种新型的热固性酚醛树脂,通过常规性能分析、凝胶渗透色谱分析、傅立叶变换红外光谱分析、热重分析等方法对两种酚醛树脂进行表征与比较。结果表明,新型的热固性酚醛树脂中聚硅氧烷与酚醛中的羟基与羟甲基进行了反应,新型热固性酚醛树脂具有分子量大、黏度低、热稳定性高等特点。将两种酚醛树脂分别配制成浸胶液,通过拉挤工艺制成试样,分析比较两组试样的力学性能指标和经过高温处理后的弯曲强度。结果表明,相对于常规的热固性酚醛树脂,PMPS改性酚醛树脂在常温下及高温处理后弯曲强度分别提高了18.7%和33.8%。

Synthesis and Application Performance of Silicone-Modified Resole Resin

One ordinary resole phenolic resin was synthesized with phenol and formalin as main raw materials under basic condition,simultaneously one new resole resin was made with polymethylbenylsiloxane (PMPS) as modifier under same condition, then make the characterization and comparison on the two resins by general performances analysis,GPC,FTIR and TG analysis. The results show that in the new resole resin PMPS react with hydroxyl group and methylol group of phenyl rings,the new resin has characteristics of large molecular weight,low viscosity and high thermal stability. Prepare dipping solution with the two resin respectively and make the specimens by pultrusion process,analyze and compare mechanical performance indexes and flexural strength after high-temperature treatment of the two specimens,the results show that flexural strength of specimen made of PMPS-modified resin increases by 18.7% at room temperature and increases by 33.8% after high-temperature treatment compared with ordinary resole resin.