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Colorless and Transparent Polyimide Films from Poly(amic acid)s with Cross-linkable Anhydride End  

Min, Ung-Ki (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Chang, Jin-Hae (Department of Polymer Science and Engineering, Kumoh National Institute of Technology)
Publication Information
Polymer(Korea) / v.34, no.6, 2010 , pp. 495-500 More about this Journal
Abstract
Crosslinked PI films were synthesized from 4,4'-(hexafluoro isopropylidene)diphthalic anhydride (6FDA) and bis[4-(3-aminophenoxy) phenyl] sulfone(BAPS) with various ratios of the reactive monomer cis-4-cyclohexene-1,2-dicarboxylic anhydride(CDBA). We prepared crosslinked poly(amic acid) (PAA) using a 0.1 wt% Grubbs catalyst as a crosslinking agent. The crosslinked PAA was heat-treated at different temperatures to give PI films. The thermo-mechanical properties and optical transparency of the PI films were investigated. The thermal properties of the PI films were examined using Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry(DSC), thermogravimetric analysis(TGA), thermo-mechanical analysis(TMA), and universal tensile machine(UTM), and their optical transparencies were investigated using UV-vis. spectrophotometry. The thermomechanical properties of the PI films improved with increasing CDBA content. However, the optical transparency of the PI films decreased slightly with increasing CDBA content.
Keywords
colorless polyimide; crosslinking; reactive monomer; Grubbs catalyst;
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