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以酶解木质素(EHL)为原料,采用苯酚-硫酸法对其进行酚化改性,所得酚化木质素(PL)在碱性条件下,与环氧氯丙烷(ECH)合成木质素基环氧树脂(L-EP),利用FT-IR对产物进行表征。探讨单因素反应条件对酚化工艺的影响。结果表明:反应时间3.0 h,反应温度95℃,2 mol/L H2SO4用量为4 mL/g时,木质素的酚化效果最佳,其酚羟基含量达到4.632 mmol/g,较EHL提高42%。研究了不同L-EP添加量对L-EP/环氧E-51复合材料力学性能和热性能的影响。结果显示:L-EP的添加量为5%时,L-EP/环氧E-51复合材料的拉伸强度最好,较纯E-51提高26%;随着L-EP添加量的增加,L-EP/环氧E-51复合材料的热稳定性增强。采用非等温法分析环氧E-51和L-EP/环氧E-51复合材料的固化动力学。结果证明:L-EP对于复合材料固化有一定的促进作用。
The enzymatic lignin (EHL) was used as a raw material, and phenolic lignin (PL) was modified by phenol-sulfuric acid method. The obtained phenolic lignin (PL) was reacted with epichlorohydrin Epoxy resin (L-EP) was used to characterize the product by FT-IR. The effect of single factor reaction conditions on phenolic process was discussed. The results showed that the best phenolic effect was achieved when the reaction time was 3.0 h, the reaction temperature was 95 ℃, and the amount of H2SO4 was 2 mL / g, the phenolic hydroxyl content reached 4.632 mmol / g, which was 42% higher than that of EHL. . The effects of different amounts of L-EP on the mechanical properties and thermal properties of L-EP / epoxy E-51 composites were studied. The results showed that the tensile strength of L-EP / E-51 composites was the best when the content of L-EP was 5%, which was 26% higher than pure E-51. With the increase of L-EP , L-EP / epoxy E-51 composite thermal stability increased. The non-isothermal method was used to analyze the curing kinetics of epoxy E-51 and L-EP / epoxy E-51 composites. The results show that: L-EP for the curing of composite materials have a certain role in promoting.