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Effects of meta and para diamines on the properties of polyetherimide nanocomposite films prepared by the sol‐gel process
Author(s) -
Chen BorKuan,
Fang YuTing,
Cheng JingRu,
Tsay SunYuan
Publication year - 2007
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/app.26260
Subject(s) - polyetherimide , nanocomposite , diamine , materials science , sol gel , thermal stability , chemical engineering , monomer , polymer chemistry , polymer , composite material , nanotechnology , engineering
The effects of chemical structure of diamines on the properties of polyetherimide (PEI) nanocomposite films prepared by the sol‐gel process were investigated. For meta diamine, nanocomposites with improved thermal, mechanical, and dielectric properties can be prepared by a sol‐gel process from soluble PEI via chemical imidization, with silica content up to 10%. However, for the PEI with p PDA as diamine and bisphenol A dianhydride, a two‐stage sol‐gel process via thermal imidization was necessary to prepare the nanocomposites. The thermal stability and mechanical properties were improved with the addition of up to 5 wt % of silica content. The variation could be attributed to the fact that differences in the compatibility between PEI and SiO 2 for two kinds of PEI with the different meta and para structure of the diamine monomer. The morphology of the fracture surfaces investigated by SEM showed a finely interconnected or cocontinuous phase for PEI nanocomposites with the silica content of up to 10% and 5 wt % for m PDA and p PDA as diamine, respectively. At higher silica contents, thermal and mechanical properties were reduced due to the aggregation of SiO 2 . © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007