# SYNTHESIS AND CHARACTERIZATION OF POLYIMIDE/SILICA NANOCOMPOSITES WITH COUPLING AGENT

> Title: SYNTHESIS AND CHARACTERIZATION OF POLYIMIDE/SILICA NANOCOMPOSITES WITH COUPLING AGENT Page Range: p.21-28 Author(s): Shang-Chih Chou; Yao-Yi Cheng; Chi-An Dai File size: 351K Download the pdf (subscribers only) Buy the pdf (non-subscribers) Journal: Polymers and Polymer Composites Issue Year: ppc Volume: 19...

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Published: 2011-01-01T00:00:00+00:00
Categories: Polymers and Polymer Composites

**Title: SYNTHESIS AND CHARACTERIZATION OF POLYIMIDE/SILICA NANOCOMPOSITES WITH COUPLING AGENT**
 Page Range: p.21-28
 Author(s): Shang-Chih Chou; Yao-Yi Cheng; Chi-An Dai
 File size: 351K
 ![](http://dload.gif) [Download the pdf](http://journals.asp?Page=111&JournalDownload=ON&JournalType=ppc&JournalIssue=ppc19-1&JournalID=101250&JIP=) (subscribers only)
 ![](http://handbuy.gif) Buy the pdf (non-subscribers)
 Journal: Polymers and Polymer Composites
 Issue Year: ppc
 Volume: 19
 Issue No: No.1

**Abstract**
 In this study, silica particles were introduced into a polyimide (PI) matrix to enhance its thermal and mechanical properties. Monomers of 3,3',4,4'-biphenyl tetracarboxylic dianhydride (BPDA) and p-phenylenediamine (p-PDA) were employed to synthesize the poly(amic acid) (PAA). Polyimide/SiO2 composites were obtained through a sol-gel process using tetraethoxysilane and multi-step thermal curing processes. The properties of the PI/SiO2 composites with various kinds of coupling agents to enhance the bonding between them were also studied. TGA results indicated that silica particles were dispersed uniformly in the PI matrix at the nano-scale level, as observed in SEM images. The coefficient of thermal expansion was decreased by an increase of the silica content. 33 Refs.

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