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|Title:||Thermal properties and electrochromic behaviour of PVA complexed electrolytes using PEG as plasticizer|
|Authors:||Gupta, P N|
|Keywords:||Complexed electrolytes;PVA, Plasticizer;Electrical conductivity;Electrochromic display|
|Abstract:||Thin films of PVA complexed with H₃PO₄ in different molar ratios using polyethylene glycol (PEG) as plasticizer are prepared by solution cast technique. Thermal study of the system of PVA- H₃PO₄-PEG indicates that glass temperature decreases as acid concentration increases in the presence of the plasticizer and hence, electrical conductivity of the complexed polymer increases. Thin films of higher conductivity are used in the fabrication of electrochromic devices. Optical absorption has been measured in transmission mode and time response of instantaneous change in optical density during colouring and bleaching sequence has been investigated by applying –5.00 to + 5.00V to the WO₃ side with respect to ITO electrode for fixed duration. The modified device using PVA- H₃PO₄-PEG system shows maximum change in optical density (0.13 for the sample PVA- H₃PO₄) and gives higher value of contrast ratio due to high electrical conductivity. It is found that the plasticizer is effective to get shorter response time for the system of PVA- H₃PO₄ -PEG in comparison to the PVA- H₃PO₄ system for which observed colouration and bleaching times are 105 and 85 s, respectively.|
|Appears in Collections:||IJPAP Vol.46(09) [September 2008]|
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