CAJ | 학술논문

以麦草醇解木质素为原料，丁二酸酐（SA）为酯化剂，1-丁基-3-甲基咪唑氯盐离子液体为反应介质，在不添加其他反应助剂和催化剂的条件下，对木质素进行酯化改性，制备了酯化木质素。研究了温度、时间、n（SA）/n（-OH）等对酯化木质素接枝率的影响，并探讨了酯化木质素对环氧树脂（EP）热稳定性、耐热性能、弯曲应力及黏接性能的影响。结果表明：酯化木质素的接枝率随n（SA）/n（-OH）增大而提高，当酯化反应在80℃持续2.0h时，接枝率高达68%；酯化木质素中出现明显的酯基特征峰，且其热稳定性得到改善；加入酯化木质素使EP的热稳定性得到改善，维卡软化温度提高近5.0℃，弯曲应力和拉伸剪切强度均有所增加。
이맥초순해목질소위원료，정이산항（SA）위지화제，1-정기-3-갑기미서록염리자액체위반응개질，재불첨가기타반응조제화최화제적조건하，대목질소진행지화개성，제비료지화목질소。연구료온도、시간、n（SA）/n（-OH）등대지화목질소접지솔적영향，병탐토료지화목질소대배양수지（EP）열은정성、내열성능、만곡응력급점접성능적영향。결과표명：지화목질소적접지솔수n（SA）/n（-OH）증대이제고，당지화반응재80℃지속2.0h시，접지솔고체68%；지화목질소중출현명현적지기특정봉，차기열은정성득도개선；가입지화목질소사EP적열은정성득도개선，유잡연화온도제고근5.0℃，만곡응력화랍신전절강도균유소증가。
The esterified lignin was prepared by esterification of alcoholysis lignin from wheat straw with succinic anhydride (SA) as esterifying agent in ionic liquid 1-butyl-3-methylimidazolium chloride without any auxiliaries and catalyst. The influences of temperature, time and molar ratio of SA to -OH on the grafting ratio of the esterified lignin were studied. And the effects of the esterified lignin on thermal stability, heat resistance bending stress and adhesive performance of epoxy resin (EP) were investigated. The results show that the grafting ratio of the esterified lignin increases with increasing the molar ratio of SA to -OH. The grafting ratio reaches 68% when the esterification last 2.0 h at 80 ℃. Obvious characteristic peaks of the ester group appear for the esterified lignin and the thermal stability of the esterified lignin is improved. Adding the esterified lignin improves the thermal stability of EP, and the Vicat softening temperature of the esterified lignin increases by nearly 5.0 ℃. Meanwhile, the bending strength and tensile shear strength of EP are enhanced.