Preparation and Properties of Cyano-Containing Polyimide Films Based on 2,6-Bis(4-aminophenoxy)- benzonitrile |
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Authors: | Baoping Lin Xiaohui Xu |
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Affiliation: | (1) Department of Chemistry and Chemical Engineering, Southeast University, 210096 Nanjing, P.R. China |
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Abstract: | Summary A series of cyano-containing polyimides were synthesized from 2,6-bis(4-amino- phenoxy)benzonitrile and some aromatic dianhydride
monomers by solution polycondensation. The poly(amic acid) films could be obtained by solution-cast from N-methyl-2-pyrrolidinone
solutions and thermally converted into tough polyimide films. Structure and physical properties of thin films of those polyimides
were measured by FTIR, TGA, dynamic mechanical analysis and LCR hitester et al. Results showed that the polyimides prepared
from 2,6-bis(4-aminophenoxy)- benzonitrile and 2,2-bis4-(3,4-dicarboxyphenoxy)phenyl]propane dianhydride or 4,4’-(hexafluoropropylidene)diphthalic
anhydride exhibited more excellent energy-damping characteristic and excellent solubility in NMP, DMF, DMAc, DMSO, THF and
CHCl3, whereas the polyimides from 2,6-bis(4-aminophenoxy)benzonitrile and 3,3’,4,4’-biphenyltetracarboxylic dianhydride or Pyromellitic
dianhydride were insoluble in polar and nonpolar organic solvents. All polyimides indicated higher glass transition temperatures,
excellent thermal stability and tensile properties. Incorporating a nitrile group into the polyimide backbone would enhance
the dielectric constant of the polyimide films. |
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