Fabrication of Transparent Cellulose Fiber Paper by Sequential Treatment of Cationic Cellulose Nanofibers and Polyvinylp
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ISSN 1229-9197 (print version) ISSN 1875-0052 (electronic version)
Fabrication of Transparent Cellulose Fiber Paper by Sequential Treatment of Cationic Cellulose Nanofibers and Polyvinylpyrrolidone Furong Xin, Huili Wang*, Feixiang Guan, Guodong Li, Zhaoping Song, Dehai Yu, and Wenxia Liu* State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China (Received October 4, 2019; Revised January 16, 2020; Accepted January 19, 2020) Abstract: Paper-based material is receiving more and more attention as an alternative of plastics in flexible electronics. However, conventional paper made of cellulose fibers is opaque owing to its micron-sized void space among fibers. Herein, cellulose fiber paper was changed into transparent paper by sequentially coating cationic cellulose nanofibers (CNFs) and polyvinylpyrrolidone (PVP). The morphology, transparency, thermal and mechanical properties were analyzed. The results show that the coating of CNFs reduces the micron-sized void space in the cellulose fiber paper, favoring the further improvement on the transparency of paper by coating PVP. By optimizing the coating amount of CNFs and PVP, a transparent paper with a transmittance of 88.5 % at 550 nm is obtained. The as-prepared transparent paper also shows improved thermal stability, slightly increased tensile strength and significantly enhanced deformation resistance. It was a potential candidate of flexible electronic substrates. Keywords: Cellulose paper, Transparency, Cellulose fibers, Cellulose nanofibers, Polyvinylpyrrolidone
the extraction of CNFs from cellulose fibers is a high-energy consumption process [17]. It has been reported that using acrylic resin to impregnate papers made of acetylated cotton fibers can obtain optically transparent composite without preparing cellulose nanofibers [18]. By impregnating cellulose fiber paper with epoxy resin, water-soluble polyurethane and polydimethylsiloxane to reduce the light scattering of the paper, the transparency of paper is significantly improved [19,20]. Dense oriented materials based on wood cellulose fibers with mild delignification can also become optically transparent by impregnation of methyl methacrylate monomers followed by an in situ polymerization of the monomers [21]. Therefore, impregnation of paper with polymers and resins having similar refractive index to cellulose can also manufacture transparent paper using micron-sized cellulose fibers. PVP is an important water-soluble polymer having good wettability and similar reflective index to cellulose. When dissolved in ethanol, the PVP solution can penetrate into lignin-removed wood to make the wood transparent [22]. Herein, we designed a strategy to prepare transparent cellulose paper by successively coating filter paper with positively charged CNF aqueous dispersion and polyvinylpyrrolidone (PVP) aqueous solution. The CNFs were used to fill the micron-sized voids and interacted with cellulose fibers by electrostatic attraction
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