Abstract: A cellulose nanowhisker (CNW) with good aqueous dispersibility was dispersed in waterborne polyol dispersion and waterborne epoxy resin dispersion to prepare a polymer nanocomposite. The effect of CNw on rheological behavior of the waterbome resin dispersion was characterized by rotary rheometer The result showed that the viscosity of the composite system increased with the increase of CNW dosage. The laser particle size analyzer was used to record the particle size distribution of the composite system, indicating that the addition of the CNW could enable a new particle peak in the particle size distribution curve, and the area of the new peak varied directly with the amount of CNw. The atomic force microscope analysis showed that CNW could be dispersed in the waterborne resin dispersions evenly and disorderly.The tensile test showed that Yong's modulus and tensile strength of the nanocomposite were reinforced by the addition of CNW. However, the elongation at break of the nanocomposite films decreased with the increase of CNw dosage. Meanwhile, the contact angle analysis showed that the addition of CNW could improve the hydrophobic property of the nanocomposite film.

Key words: cellulose nanowhisker, waterborne resin, composite, rheological property

摘要： 利用纤维素纳米晶须（CNW）的水可分散性，分别将 CNW 水悬浮液均匀分散在水性环氧树脂基多元醇和水性萜烯基环氧树脂分散体中。 以旋转流变法分析了 CNW 对水性树脂体系流变行为的影响，结果表明：复合体系的黏度都随 CNW 添加量的增加而增大。 用粒径分析仪观察了 ＣＮＷ 对复合体系的粒径及其分布的影响，加入 CNW 后分布曲线出现了 CNW 粒径峰，粒径峰面积的变化与CNW 的加入量成正比。 复合体系的原子力显微镜分析表明：ＣCNW能均匀无序地分布在水性树脂体系中。 复合产物的拉伸测试表明，复合涂膜的拉伸模量和拉伸强度都随着 CNW 添加量的增加而显著提高，断裂伸长率随 CNW 添加量的增加而下降。 接触角测定表明，添加 CNW 可以提高复合涂膜表面的疏水性。

关键词: 纤维素纳米晶须, 水性树脂, 复合, 流变特性