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Synthesis and properties of flourine‐containing polyimides
Author(s) -
Wang ChunShan,
Yang RongWen
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19971024)66:4<609::aid-app1>3.0.co;2-w
Subject(s) - materials science , polyimide , amorphous solid , propane , glass transition , polymer , polymer chemistry , condensation polymer , condensation , organic chemistry , chemistry , composite material , physics , layer (electronics) , thermodynamics
A series of new flourine‐containing polyimides have been synthesized from the condensation of 2,2,‐ bis [4‐(4‐aminophenoxy)phenyl]propane, 2,2‐ bis [4‐(4‐amino‐phenoxy)phenyl]‐1,1,1,3,3,3‐hexafluoropropane, or 2,2 bis [4‐(4‐amino‐2‐trifluoro‐methylphenoxy)phenyl]‐1,1,1,3,3,3‐hexafluoropropane with various aromatic dianhydrides. The electric constant at 1 KHz in the flourine‐containing polyimides decreases from 3.51 to 2.72 as flourine content increases. The poly(amic acid)s had inherit viscosities of 0.52–1.23 dL/g, depending on the diamines and dianhydrides. Most of the resulting polymers showed an amorphous nature and afforded flexible and tough films. The amount of moisture absorption decreases as flourine content in polyimides increases. The glass transition temperatures of these polyimides were in the range of 287–328°C, and the 10% weight loss temperatures were above 542°C in the nitrogen. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 609–617, 1997