酶解法制备的球形与棒状纤维素纳米晶：作为聚乙烯醇增强剂的比较研究。

Spherical vs rod-like cellulose nanocrystals from enzymolysis: A comparative study as reinforcing agents on polyvinyl alcohol.

机构信息

State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Road, Guangzhou, 510641, PR China.

出版信息

Carbohydr Polym. 2021 Mar 15;256:117493. doi: 10.1016/j.carbpol.2020.117493. Epub 2020 Dec 14.

DOI:10.1016/j.carbpol.2020.117493

PMID:33483022

Abstract

In this paper, we have isolated cellulose nanocrystallines (CNCs) with different morphologies by enzymatic hydrolysis, and prepared flexible and transparent nanocomposite films with PVA matrix via solution casting. By means of SEM, UV-vis, XRD, DTG, FT-IR and mechanical methods, the effects of rod-shaped cellulose nanocrystallines (RCNCs) and spherical cellulose nanocrystallines (SCNCs) on PVA nanocomposite films were compared systematically. The results showed CNCs with different morphologies had little effect on the transparency of the composite films, and the crystallinity fluctuated with the change of CNCs additive amount. Compared with the RCNCs, SCNCs had a better improve ability to the thermal stability of the composite films by promoting pyrolysis temperature 60-80 °C. On the contrary, the maximum mechanical properties of the composite films of RCNCs were much higher than those of SCNCs, and the Young's modulus of the PVA/RCNCs composite film were increased by 120.97 % in comparison with the pure PVA.

摘要

本文通过酶解的方法分离得到了具有不同形态的纤维素纳米晶（CNCs），并通过溶液浇铸法制备了具有 PVA 基体的柔性透明纳米复合材料薄膜。通过 SEM、UV-vis、XRD、DTG、FT-IR 和力学方法，系统地比较了棒状纤维素纳米晶（RCNCs）和球形纤维素纳米晶（SCNCs）对 PVA 纳米复合材料薄膜的影响。结果表明，不同形态的 CNCs 对复合材料薄膜的透明性影响不大，结晶度随 CNCs 添加量的变化而波动。与 RCNCs 相比，SCNCs 通过促进热解温度升高 60-80°C，对复合薄膜的热稳定性具有更好的改善能力。相反，RCNCs 复合材料薄膜的最大力学性能远高于 SCNCs，与纯 PVA 相比，PVA/RCNCs 复合薄膜的杨氏模量提高了 120.97%。