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Syntheses and properties of PI/clay hybrids
Author(s) -
Gu Aijuan,
Kuo ShiaoWei,
Chang FengChih
Publication year - 2001
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 - 10.1002/1097-4628(20010307)79:10<1902::aid-app190>3.0.co;2-s
Subject(s) - pyromellitic dianhydride , polyimide , montmorillonite , ultimate tensile strength , absorption of water , materials science , dispersion (optics) , polymer chemistry , thermal expansion , elongation , chemical engineering , absorption (acoustics) , dimethylacetamide , chemistry , composite material , solvent , organic chemistry , physics , layer (electronics) , optics , engineering
A new organomontmorillonite (CM) for PI hybrids has been developed by ion‐exchange reaction of cetyl pyridum chloride with Na + montmorillonite (MMT). Polyimide/clay hybrids have been synthesized by employing two methods. Method I is by first blending a dimethylacetamide (DMAC) solution of 4,4′‐oxydianiline diamine (ODA) with a DMAC dispersion of CM before adding pyromellitic dianhydride (PMDA). Method II is by blending a DMAC solution of poly(amic acid) with a DMAC dispersion of CM. Tensile, thermal, dielectric, and water‐absorption properties of hybrids prepared by these two methods have been studied in detail. Results show that these properties depend on the clay type (organophilic or not), clay concentration, and the method to synthesis hybrids. The CM concentration of 3 wt % in the hybrid by Method II results in optimum properties in tensile strength, modulus, elongation, coefficient of thermal expansion (CTE), and water absorption. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1902–1910, 2001