多羧基纤维素纳米晶的制备与性能研究

Study on Preparation and Properties of Multi-carboxyl Cellulose Nanocrystal

中文关键词:  纤维素纳米晶  EDTAD酯化法  TEMPO氧化法  分散性

Key Words:cellulose nanocrystal  EDTAD-esterification  TEMPO-oxidation  dispersity

中文摘要:

      采用乙二胺四乙酸二酐（EDTAD）酯化法制备表面羧基含量及羟基取代度可控的多羧基化纤维素纳米晶（ECNC），并通过改变酯化条件，优化实验结果；通过傅里叶变换红外光谱（FT IR）、透射电子显微镜（TEM）、电导滴定、X射线衍射（XRD）、元素分析、Zeta电位等对ECNC进行分析。结果表明，ECNC保持了CNC的形貌和结晶结构完整性，并且在水和磷酸盐（PBS）缓冲溶液中的分散性较CNC显著提高；同时，通过改变酯化反应条件可控制ECNC表面羧基含量及羟基取代度。该ECNC颗粒有望用于高性能复合纳米材料的制备及功能化纳米复合颗粒的制备中。

Abstract:

      Multi-carboxyl cellulose nanocrystal （ECNC） with controllable carboxyl content and substitution degree of hydroxyl was obtained by EDTAD-esterification. The results were optimized by changing the esterification conditions. FT-IR， TEM， conductimetric titration， XRD， elemental analysis and Zeta potential test were used to characterize the property of ECNC. It was found that the morphology and the integra-lity of crystal structure of cellulose nanocrystals （CNC） were maintained during EDTAD-esterification， and the dispersity of CNC in water and PBS buffer could also be improved. At the same time， the surface carboxyl content of ECNC and substitution degree of hydroxyl could be controlled by changing the esterification conditions. It was believed that ECNC could be used in the fabrication of high-efficiency nanocomposite polymers and particles．