4.7 Article

Rice straw cellulose microfiber reinforcing PVA composite film of ultraviolet blocking through pre-cross-linking

Journal

CARBOHYDRATE POLYMERS
Volume 296, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2022.119886

Keywords

Rice straw; Composite film; Mechanical property; Cross -linking; UV blocking

Funding

  1. National Natural Science Foundation of China [U21A2096]
  2. Natural Science Foundation of Shandong Prov- ince, China [ZR2019BEM035]
  3. National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials [2020KFJJ10]

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Rice straw cellulose microfiber (CMF) was obtained through low-temperature phase transition method. Chemical modification was carried out to prepare aldehyde CMF (a-CMF), which was then used to reinforce polyvinyl alcohol (PVA) composite films. The resulting films showed improved mechanical properties and excellent transparency and UV blocking performance.
Rice straw cellulose microfiber (CMF) was obtained through the gentle low-temperature phase transition method. Then, NaIO4 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.

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