Chin‐Ping Yang, S. Hsiao, Kuei-Hung Chen
Sep 1, 2002
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Influential Citations
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Quality indicators
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Polymer
Abstract
Abstract A novel fluorinated diamine monomer, 4,4′-bis(4-amino-2-trifluoromethylphenoxy)-3,3′,5,5′-tetramethylbiphenyl, was prepared by a nucleophilic chloro-displacement reaction of 3,3′,5,5′-tetramethyl-4,4′-biphenol with 2-chloro-5-nitrobenzotrifluoride and subsequent reduction of the intermediate dinitro compound. The diamine was reacted with aromatic dianhydrides to form polyimides via a two-step polycondensation method; formation of poly(amic acid)s, followed by thermal imidization. All the resulting polyimides were readily soluble in many organic solvents and exhibited excellent film forming ability. The polyimides exhibited high T g (312–351 °C), good thermal stability, and good mechanical properties. Low moisture absorptions (0.2–1.1 wt%), low dielectric constants (2.54–3.64 at 10 kHz), and low color intensity were also observed.