In this work, all cellulose composite (ACC) films were prepared through a blocked polyisocyanate (BPIC) induced cross-linking of hydroxyethyl cellulose (HEC) and cellulose nanocrystals (CNC). The chemical characterization indicates that the covalent bonds have been formed between HEC and CNC. Mechanical test shows that the addition of 4 % CNC into the HEC matrix improves the tensile strength by 120.2 % compared to the neat HEC film. The further incorporation of 10 % BPIC into the above ACC film can enhance the tensile strength by 280.2 %. The water contact angles of the ACC film that constituted by 4 % CNC and 10 % BPIC is increased to 100.1° while the thermal decomposition temperature is up to 210 °C. The morphological analysis suggests that the CNC is beneficial to the dispersion of the cross-linked HEC, which increases the elongation at break and maintains the excellent tensile strength meanwhile.

在这项工作中，所有纤维素复合材料（ACC）膜都是通过封闭的多异氰酸酯（BPIC）诱导的羟乙基纤维素（HEC）和纤维素纳米晶体（CNC）交联制备的。化学特征表明，HEC和CNC之间已形成共价键。机械测试表明，与纯HEC膜相比，在HEC基质中添加4％CNC可使拉伸强度提高120.2％。在上述ACC膜中进一步掺入10％BPIC可以使拉伸强度提高280.2％。当热分解温度高达210°C时，由4％CNC和10％BPIC构成的ACC膜的水接触角增加到100.1°。形态分析表明，CNC有利于分散交联的HEC，