氯化铁催化马来酸水解制备纤维素纳米晶体及其性能研究

Study on Properties and Fabrication of Cellulose Nanocrystal by Hydrolysis of Maleic Acid Catalyzed by Ferric Chloride

关键词:  纤维素纳米晶体  氯化铁催化  有机酸水解

Key Words:cellulose nanocrystal  FeCl₃ catalysis  organic acid hydrolysis

摘要:本研究以杨木片为原料，通过硫酸盐法制浆、过氧化氢漂白获得漂白硫酸盐浆（BHKP）；采用氯化铁催化马来酸水解BHKP制备纤维素纳米晶体（CNC），在水解时间6 h的条件下，探讨了水解温度、氯化铁用量对所制CNC性能（如形貌、热稳定性、晶体结构以及表面化学结构）的影响。结果表明，在水解温度100 ℃、氯化铁用量0.02 mmol/g BHKP的反应条件下，CNC得率高达61.9%，直径为10~25 nm，长度为100~275 nm，Zeta电位-40.9~-21.2 mV，结晶指数达70.9%，羧基含量为0.52 mmol/g，热稳定性好（T_max约为359 ℃）。

Abstract:In this study， poplar wood chips were used as raw materials， and bleached sulfate pulp （BHKP） was prepared by sulfate pulping and hydrogen peroxide bleaching methods. At the hydrolysis time of 6 h， cellulose nanocrystal （CNC） were prepared by the hydrolysis of BHKP with maleic acid （MA） catalyzed by ferric chloride （FeCl₃）. The effects of hydrolysis temperature and FeCl₃ dosage on the properties of prepared CNC were investigated， such as morphology， thermal stability， crystal structure， and surface chemical structure. The results showed that under the reaction conditions of hydrolysis temperature of 100 ℃ and the FeCl₃ dosage of 0.02 mmol/g BHKP， the yield of CNC reached 61.9%， the properties of CNC were better， with the diameters of 10~25 nm， the lengths of 100~275 nm， the Zeta potentials of ranging from -40.9 mV to -21.2 mV， the crystallization index of 70.9%， the carboxylate contents of 0.52 mmol/g， and the good thermal stability （T_max of about 359 ℃）.