Preparation of Polyimide-Silica Nanocomposites from Nanoscale Colloidal Silica

Abstract

ABSTRACT:The polyamic acid (PAA) solutions were blended directly with a commercial nanoscale colloidal silica sol, and converted to polyimides (PIs)/silica nanocomposite films. Polyamic acid was prepared from the reaction of Pyromellitic anhydride (PMDA), 4,4-oxydianiline (ODA). The nanoscale silica particles were dispersed well in PI from scanning electron microscopy (SEM) and the nanocomposite films showed a moderated optical transparency for up to 30 wt % of silica content. These PI/silica nanocomposite films exhibited better mechanical properties, higher glass transition temperature (T g ), better thermal stability and lower coefficient of thermal expansion (CTE) with increasing silica content from tensile tests, dynamic mechanic analysis (DMA) and thermogravimetric analysis (TGA).

Polymer/Silica Nanocomposites: Preparation, Characterization, Properties, and Applications

“…Inorganic particles may disperse homogeneously in the polymer matrices when they are premodified by a coupling agent . The studied polymers include PA 6, – PET, – PI, ,– N , N ′-bismaleimide-4,4′-diphenylmethane polymer, PMMA, ,,,, PHEMA, ,, PVA, acrylic polymer, epoxy polymer, ,– PU, – PCL, , and poly(butylene succinate) …”

Polylactide/nano and microscale silica composite films. I. Preparation and characterization

“…The sol-gel technique also allows coupling with organic polymeric materials, 17,18 and nanoscale colloidal silica sol has been used in the preparation of epoxy/SiO 2 19 and PI/ SiO 2 . 20 In this article, PLA/SiO 2 composites are prepared by a sol-gel process and blending with commercial silica sol. The dispersion of SiO 2 was observed, and its effect on the mechanical and thermal stability before and after hydrolytic aging.…”

Research Progress and Application of Polyimide-Based Nanocomposites

“…This transparent composite PI with high haze and acceptable light transmittance is ideal for large-area flexible OLED lighting panel substrates with scattering phenomena [ 116 ]. Research about highly porous silica/PI (SiO 2 /PI), dimethicone/PI, three-phase PI/graphene/barium titanate composites, and so on have been reported using this method [ 117 , 118 , 119 , 120 ]. The prepared composites have the strengths of easy processing, large porosity, superior thermal stability, and high thermal degradation temperature.…”