经预交联提高抗紫外性能的水稻秸秆纤维素微纤维增强 PVA 复合膜
Rice straw cellulose microfiber reinforcing PVA composite film of ultraviolet blocking through pre-cross-linking.
机构信息
Institute of Functional Textiles and Advanced Materials, College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-textiles, Qingdao University, Qingdao 266071, China.
Institute of Functional Textiles and Advanced Materials, College of Textiles and Clothing, State Key Laboratory of Bio-Fibers and Eco-textiles, Qingdao University, Qingdao 266071, China.
出版信息
Carbohydr Polym. 2022 Nov 15;296:119886. doi: 10.1016/j.carbpol.2022.119886. Epub 2022 Jul 21.
Rice straw cellulose microfiber (CMF) was obtained through the gentle low-temperature phase transition method. Then, NaIO was utilized to modify CMF by selective oxidation to prepare aldehyde CMF (a-CMF) to improve the reactivity of the CMF. Finally, the a-CMF reinforced polyvinyl alcohol (PVA) composite films were prepared through a pre-cross-linking and solvent casting approach. The cross-linking network formed by a-CMF and PVA through the aldolization reaction significantly improved the mechanical properties of the a-CMF/PVA composite film. The tensile strength of a-CMF-2/PVA was 37.54 ± 0.77 MPa, which was higher than 25.88 ± 2.97 MPa of the pure PVA. SEM results showed that the fracture surface of the a-CMF/PVA composite film with the cross-linking network was smooth. In addition, prepared a-CMF-2/PVA composite films had a transmittance of over 80 % in the visible light range, and also possessed excellent UV blocking property.
稻秸纤维素微纤维（CMF）通过温和的低温相变法获得。然后，利用 NaIO 通过选择性氧化来修饰 CMF，制备醛基 CMF（a-CMF）以提高 CMF 的反应性。最后，通过预交联和溶剂浇铸法制备 a-CMF 增强的聚乙烯醇（PVA）复合膜。通过醇醛缩合反应形成的 a-CMF 和 PVA 之间的交联网络显著提高了 a-CMF/PVA 复合膜的机械性能。a-CMF-2/PVA 的拉伸强度为 37.54 ± 0.77 MPa，高于纯 PVA 的 25.88 ± 2.97 MPa。SEM 结果表明，具有交联网络的 a-CMF/PVA 复合膜的断裂面光滑。此外，所制备的 a-CMF-2/PVA 复合膜在可见光范围内的透光率超过 80%，并且还具有优异的紫外线阻挡性能。
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