Projects per year
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 language | English |
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Pages (from-to) | 2393-2401 |
Number of pages | 9 |
Journal | ACS Applied Polymer Materials |
Volume | 3 |
Issue number | 5 |
Early online date | 16 Mar 2021 |
DOIs | |
Publication status | Published - 14 May 2021 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Barrier properties
- Cellulose acetate
- Cross-linking
- Electrochromic displays
- Hydrophobization
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Dive into the research topics of 'Cross-linked and surface-modified cellulose acetate as a cover layer for paper-based electrochromic devices'. Together they form a unique fingerprint.Projects
- 2 Finished
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FinnCERES: Competence Center for the Materials Bioeconomy: A Flagship for our Sustainable Future
Mäkelä, K. (Principal investigator)
01/05/2018 → 31/12/2022
Project: Academy of Finland: Other research funding
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INNPAPER: Innovative and Smart Printed Electronics based on Multifunctionalized Paper: from Smart Labelling to Point of Care Bioplatforms
Rojas Gaona, O. (Principal investigator), Imani, M. (Project Member), Kong, W. (Project Member), Borghei, M. (Project Member), Solin, K. (Project Member), Johansson, L.-S. (Project Member) & Kämäräinen, T. (Project Member)
01/01/2018 → 31/12/2021
Project: EU: Framework programmes funding