Cross-linked and surface-modified cellulose acetate as a cover layer for paper-based electrochromic devices

Joice Jaqueline Kaschuk, Maryam Borghei, Katariina Solin, Anurodh Tripathi, Alexey Khakalo, Fábio A.S. Leite, Aida Branco, Miriam C. Amores de Sousa, Elisabete Frollini, Orlando J. Rojas (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    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.

    Original languageEnglish
    JournalACS Applied Polymer Materials
    DOIs
    Publication statusAccepted/In press - 2021
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Barrier properties
    • Cellulose acetate
    • Cross-linking
    • Electrochromic displays
    • Hydrophobization

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