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    Cross-Linked and Surface-Modified Cellulose Acetate as a Cover Layer for Paper-Based Electrochromic Devices

    Year: 2021

    Journal: ACS Appl. Polym. Mater., Volume 3, MAY 14, page 2393–2401

    Authors: Kaschuk, Joice Jaqueline; Borghei, Maryam; Solin, Katariina; Tripathi, Anurodh; Khakalo, Alexey; Leite, Fabio A. S.; Branco, Aida; de Sousa, Miriam C. Amores; Frollini, Elisabete; Rojas, Orlando J.

    Organizations: Sao Paulo Research Foundation - FAPESP [2017/13500-2]; CNPq (National Counsel of Technological and Scientific Development, Brazil); Academy of Finland's Flagship Program [318890, 318891]; European Union [760876]

    Keywords: cellulose acetate; cross-linking; hydrophobization; barrier properties; electrochromic displays

    We studied the surface and microstructure of cellulose acetate (CA) films to tailor their barrier and mechanical properties for application in electrochromic devices (ECDs). Cross-linking of CA was carried out with pyromellitic dianhydride to enhance the properties relative to unmodified CA: solvent resistance (by 43% in acetone and 37% in DMSO), strength (by 91% for tensile at break), and barrier (by 65% to oxygen and 92% to water vapor). Surface modification via tetraethyl orthosilicate and octyltrichlorosilane endowed the films with hydrophobicity, stiffness, and further enhanced solvent resistance. A detailed comparison of structural, chemical, surface, and thermal properties was performed by using X-ray diffraction, dynamic mechanical analyses, Fourier-transform infrared spectroscopy, and atomic force microscopy. Coplanar ECDs were synthesized by incorporating a hydrogel electrolyte comprising TEMPO-oxidized cellulose nanofibrils and an ionic liquid. When applied as the top layer in the ECDs, cross-linked and hydrophobized CA films extended the functionality of the assembled displays. The results indicate excellent prospects for CA films in achieving environmental-friendly ECDs that can replace poly(ethylene terephthalate)-based counterparts.
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