多酚改性热固性酚醛树脂合成反应过程研究

Study on the synthesis process of multi-phenols modified resole resin

采用傅里叶红外光谱、凝胶渗透色谱及热重分析等研究了多酚改性热固性酚醛树脂反应过程中结构与性能的变化。结果表明:随反应时间的延长,多酚改性酚醛树脂羟甲基指数变化较复杂,但总体变化趋势为先增加后减小,亚甲基指数逐渐增大,且先快后慢。树脂重均分子质量由327增加至4 038,分子质量分布由1.30增加至7.11,反应180 min时,低、中、高分子3组分质量分数最为接近,分别为24.4%、37.8%和37.8%,且此时树脂热稳定性最佳,800℃时的残炭率和热分解温度分别为67.15%和529.7℃。

The changes of the structure and properties of multi-phenols modified resole resin （d-PF） were investigated by FT-IR, GPC and TG analysis. The results showed that the change of the hydroxymethyl index was complicated with the increasing of reaction time, but overall increased firstly and then decreased. The index of methylene was increased rapidly firstly and then slowly. The molecular weight of d-PF was increased from 327 to 4 038 and the molecular weight distribution was increased from 1.30 to 7.11. After reacted for 180 min, the mass fraction of low, middle and high molecules were 24.4%, 37.8% and 37.8%, respectively and were really closed. At this time, the thermal stability of the resin was the best. The char yield and thermal decomposition temperature of d-PF at 800 ℃ were up to 67.15% and 529.7 ℃, respectively.