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Published on: October 21, 2016
Cross-Linked and Surface-Modified Cellulose Acetate as a Cover Layer for Paper-Based Electrochromic Devices
Joice Jaqueline Kaschuk1,2, Maryam Borghei2, Katariina Solin2
1Macromolecular Materials and Lignocellulosic Fibers Group, Center for Research on Science and Technology of BioResources, Institute of Chemistry of São Carlos, University of São Paulo, CP 780, 13560-970 São Carlos, São Paulo, Brazil.
Modified cellulose acetate films show improved solvent resistance, strength, and barrier properties for eco-friendly electrochromic devices (ECDs). These enhanced films offer a sustainable alternative to traditional materials in display technology.
Area of Science:
- Materials Science
- Polymer Chemistry
- Electrochemistry
Background:
- Cellulose acetate (CA) films are explored for electrochromic devices (ECDs).
- Unmodified CA has limitations in solvent resistance, mechanical strength, and barrier properties.
- Developing advanced materials is crucial for next-generation ECDs.
Purpose of the Study:
- To tailor cellulose acetate (CA) films for enhanced barrier and mechanical properties.
- To investigate surface modifications for improved hydrophobicity and solvent resistance.
- To evaluate the performance of modified CA films in electrochromic devices (ECDs).
Main Methods:
- Cross-linking of CA films using pyromellitic dianhydride.
- Surface modification with tetraethyl orthosilicate and octyltrichlorosilane.
- Characterization using X-ray diffraction, dynamic mechanical analysis, FTIR, and AFM.
- Synthesis of coplanar ECDs with a hydrogel electrolyte.
Main Results:
- Cross-linked CA showed significant improvements: 43% higher solvent resistance, 91% increased tensile strength, and enhanced barrier properties (65% O2, 92% H2O).
- Surface modification imparted hydrophobicity, stiffness, and further improved solvent resistance.
- Modified CA films successfully extended the functionality of assembled ECDs.
Conclusions:
- Cross-linked and surface-modified CA films offer superior properties for ECD applications.
- These CA films present a promising, environmentally friendly alternative to poly(ethylene terephthalate) in displays.
- The study highlights the potential of cellulose-based materials in advanced electronic devices.
