Journal
ACS APPLIED POLYMER MATERIALS
Volume 3, Issue 5, Pages 2393-2401Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsapm.0c01252
Keywords
cellulose acetate; cross-linking; hydrophobization; barrier properties; electrochromic displays
Funding
- 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]
- H2020 Societal Challenges Programme [760876] Funding Source: H2020 Societal Challenges Programme
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By modifying the structure and surface properties of cellulose acetate (CA) films, their application performance in electrochromic devices (ECDs) can be improved, such as enhanced solvent resistance and strength. The results indicate that cross-linked and hydrophobized CA films can extend the functionality of assembled displays, providing excellent prospects for environmentally friendly ECDs.
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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