基于三元低共熔溶剂体系制备阳离子化改性纤维素纳米纤丝及其性能研究

Preparation and Performance of Cationic Modified Cellulose Nanofibril Based on Ternary Deep Eutectic Solvent System

关键词:  三元低共熔溶剂  双醛纤维素  阳离子化改性  纤维素纳米纤丝

Key Words:ternary deep eutectic solvent  dialdehyde cellulose  cationic modification  cellulose nanofibril

摘要:本研究以相思阔叶木浆为原料，采用氯化胆碱-甘油-氨基胍盐酸盐三元低共熔溶剂（DES）体系对高碘酸钠氧化生成的双醛纤维素（DAC）进行阳离子化改性预处理，结合超微粉碎和高压均质处理，制备阳离子化改性纤维素纳米纤丝（CCNF）。结果表明，经过DES阳离子化改性预处理后制备的CCNF比未经过任何改性处理所制备的CNF的结晶度增加，预处理60 min时，CCNF最大结晶度为63.36%，阳离子基团的引入使Zeta电位显著增大，由-18.0 mV至53.4 mV，但DES预处理会破坏纤维的内部结构，从而使悬浮液稳定性降低。

Abstract:In this study， acacia broadleaf wood pulp was used as the raw material. The cationic modified cellulose nanofibril （CCNF） was prepared by cationic modified pretreatment of sodium periodate oxidized dialdehyde cellulose （DAC） with choline chloride-glycerol-aminoguanidine hydrochloride ternary deep eutectic solvent （DES） system， combined with ultra-micro-comminution and high-pressure homogenization. The results showed that the crystallinity of CCNF prepared after DES cationization modification pretreatment was increased with the maximum crystallinity of 63.36% when pretreated for 60 min compared with that of CNF prepared without any modification treatment. The introduction of cationic groups significantly increased the Zeta potential from -18.0 mV to 53.4 mV， but DES pretreatment would destroy the internal structure of the fiber， thus reducing the stability of the suspension.