Control of particle size and morphology in compatiblized self-catalyzed co-polyimide/SiO2 nanocomposites

Farman Ali, Shaukat Saeed, Khaled Saoud, Syed Sakhawat Shah

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The size of the silica particles and morphology of hybrids were controlled in copolyimide based hybrids through amino-silane functionalization of silica particles prepared in situ through a self-catalyzed sol-gel process using atmospheric moisture. The particles were generated using tetraethoxysilane in the uncompatiblized (UPISH) system whereas a mixture of 3-aminopropyltrietoxysilane and tetraethoxysilane was used in the compatiblized Co-PI/silica hybrid (CPISH) system. The properties of resulting hybrid films were measured by Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, Thermogravimetirc Analysis, Dynamic Mechanical Analysis and Universal Testing Machine. FTIR results confirmed the formation of silica particles and Co-PI matrix. FE-SEM images revealed spherical silica particles with sharp boundaries in UPISH; whereas nano-sized coupled silica network structures with totally different morphologies were observed in CPISH system. The CPISH system exhibited better thermal stability, higher modulus and Tg values than UPISH system. The improvement in thermal and mechanical properties has been discussed with reference to morphological changes due to incorporation of 3-aminopropyltrietoxysilane in aerobic condition and in a self-catalyzed sol-gel process.

Original languageEnglish
Pages (from-to)810-817
Number of pages8
JournalJournal of the Chemical Society of Pakistan
Volume36
Issue number5
Publication statusPublished - 1 Oct 2014
Externally publishedYes

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Keywords

  • Coupling agent
  • Nanocomposites
  • Organic-inorganic hybrid
  • Polyimide
  • Self-catalyzed sol-gel
  • Thermal and mechanical properties

ASJC Scopus subject areas

  • Chemistry(all)

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