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S. ARORA1, S. KUMAR2,*
Polyimides with high glass transition temperatures were prepared by reaction of various diaminopyrazole derivatives with 4,4'-(hexafluoroisopropylidene)diphthalic anhydride and characterized by spectral and thermal techniques. Glass transition temperatures of resulting polyimides in the range of 193-216 °C were obtained. Vacuum-deposited thin films of polyimides were corona poled under different poling conditions and analyzed for poling stability of aligned dipolar chromophore. At room temperature, polar order remained stable for all the polymers with only 1-2 % decay even after 30 days of poling under the conditions (5 kV, 185 °C, 30 min.). It was further observed that after 200 h, poled order stabilized in the range 81-92 % and 69-85 % of initial value when polymeric thin films were heated at 80 °C and 90 °C respectively.
Polyimide, Thin film, Corona poling, Poling stability, Dipolar Chromophore.
S. ARORA, S. KUMAR, Vacuum-deposited poled polyimide thin films with high poling stability of dipolar chromophores, Optoelectronics and Advanced Materials - Rapid Communications, 4, 12, December 2010, pp.2140-2147 (2010).
Submitted at: Oct. 15, 2010
Accepted at: Nov. 29, 2010
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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