纤维素苯甲酸酯接枝二乙二醇十六烷基醚的制备及性能

发布时间：2018-06-05 00:22

  本文选题：微晶纤维素 + 接枝反应　； 参考：《高等学校化学学报》2017年06期

【摘要】：分别以1-烯丙基-3-甲基咪唑氯盐([Amim]Cl)和1-乙基-3-甲基咪唑醋酸盐([Emim]Ac)/N,N-二甲基乙酰胺(DMAc)为溶剂体系,以微晶纤维素(聚合度为220)和苯甲酰氯(BC)为原料制备纤维素苯甲酸酯(CB).探索了溶剂体系、反应温度和投料比对产物取代度、溶解性和熔融性能的影响.结果表明,以[Amim]Cl为溶剂时,随着反应温度的升高(60~80℃)或体系中苯甲酰氯与葡萄糖单元环(AGU)投料量的增加(3∶1~9∶1),产物的溶解性和熔融性能均提高,取代度也随之升高(0.13~2.98);以[Emim]Ac/DMAc为溶剂时,产物中苯甲酰基的接枝度较低,且共聚物中引入乙酰基不适合制备纤维素-g-苯甲酰氯.初步探讨了在[Amim]Cl中合成纤维素苯甲酸酯接枝二乙二醇十六烷基醚(CB-g-E_2C_(16))固-固相变材料的性能,研究结果表明,CB-g-E_2C_(16)相变材料的相变温度为12.7~29.1℃,相变焓为12~24 J/g,在294℃仍能保持热稳定性,为该类纤维素基固-固相变材料的可熔融加工奠定了理论基础.
[Abstract]:Cellulose benzoate was prepared from 1-allyl -3-methylimidazolium chloride (Amim) and 1-ethyl-3-methyl imidazole acetate (Emim) as solvent system, using microcrystalline cellulose (polymerization degree = 220) and benzoyl chloride (BC) as raw materials. The effects of solvent system, reaction temperature and feed ratio on the degree of substitution, solubility and melting property of the product were investigated. The results showed that when [Amim] Cl was used as solvent, the solubility and melting property of the product were improved with the increase of reaction temperature (6080 鈩，

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