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Effects of ethylene‐acrylic acid ionomer on thermomechanical and electrochromic properties of electrochromic devices using gelatin‐based electrolytes
Author(s) -
Wootthikanokkhan Jatuphorn,
Jaruphan Palaya,
Azarian Mohammad Hossein,
Yosthisud Jarinya
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49362
Subject(s) - gelatin , electrochromism , materials science , electrolyte , ionomer , electrochromic devices , acrylic acid , chemical engineering , composite material , polymer chemistry , polymer , electrode , copolymer , organic chemistry , chemistry , engineering
Transparent adhesive polymer electrolytes, to be used for fabrication of electrochromic glass via a lamination process, were developed from gelatin blended with ethylene‐acrylic acid (EAA) copolymer ionomer resin. The gelatin‐based electrolyte films were prepared by mixing the polymer with glycerol, LiClO 4 , formaldehyde, and EAA in a microcompounder. The concentration effect of EAA (i.e., 2.5, 5, 10, and 20 wt% with respect to the gelatin) on thermomechanical, optical, and electrochemical properties of the prepared films were then studied. Results from atomic force micrographs revealed that surface roughness of the neat gelatin film significantly decreased after blending with 20 wt% EAA. This corresponds to the highest ionic conductivity value (4.46 × 10 −6 S/cm) of gelatin‐based electrolyte in this study. Percentage light transmittance was also maintained above 80%, provided that the concentration of ionomer was kept below 20%. Finally, performance of the electrochromic device with a configuration of ITO/WO 3 /gelatin/NiO/ITO was demonstrated. Coloration efficiency and response time of 60.38 cm 2 /C and 10 s/50 s (coloring/bleaching) were achieved, respectively.