Journal
EUROPEAN POLYMER JOURNAL
Volume 46, Issue 9, Pages 1878-1890Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2010.06.010
Keywords
Fluorinated polyimides; 1.3-Catenated naphthalene; Solubility; Optical transparency; Low dielectric constants
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Funding
- National Science Council of Taiwan (ROC)
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A new structurally asymmetric diamine monomer containing flexible ether linkages and bulky trifluoromethyl substituents, namely 1,3-bis(4-amino-2-trifluoromethylphenoxy)naphthalene, was prepared from 1,3-dihydroxynaphthalene and 2-chloro-5-nitrobenzotrifluoride. New series of fluorinated polyimides were synthesized from the diamine with six commercially available aromatic tetracarboxylic dianhydrides using a conventional two-stage process with thermal or chemical imidization. The resulting polyimides were highly soluble in a variety of organic solvents and could afford transparent and tough films via solution casting. These polyimides exhibited moderately high glass-transition temperatures (by DSC) of 236-268 degrees C and softening temperatures (by thermomechanical analysis) of 231-250 degrees C, and they did not show significant decomposition before 500 degrees C under either nitrogen or air atmosphere. Also, they revealed low moisture absorptions (0.32-0.78%), low dielectric constants (2.81-3.24 at 10 kHz), and high optical transparency (ultraviolet-visible absorption cutoff wavelengths of 377-426 nm). (C) 2010 Elsevier Ltd. All rights reserved.
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