Abstract
ABSTRACT Thermally stable nanocomposites from polyimide (PI) and silica have been prepared through the sol-gel process. PI matrix, prepared by the reaction of a mixture of phenylenediamine and oxydianiline with an equimolar amount of pyromellitic dianhydride, acted as a reference. The polymer matrix was modified by replacing phenylenediamine with 2,4-diaminophenol to include pendant hydroxyl groups on the chain. Composite films were prepared using different amounts of silica generated in-situ in both type of matrices. These were evaluated by a variety of techniques, including FTIR, SEM, tensile, dynamic mechanical, thermal, and thermogravimetric analyses. The presence of hydroxyl group on polymer chain caused an intimate dispersion of the two phases, which resulted in the formation of nano-sized co-continuous domains as compared to that of the corresponding PI system having no pendent hydroxyl groups. The mechanical and thermal properties of these composites have been compared and explained in term of increased matrix polarity.
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