Preparation and properties of poly(dimethyl siloxane)-colloidal silica/functionalized colloidal silica nanocomposites

Sumi Dinkar, A. Dhanabalan, B. H.S. Thimmappa

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Aqueous spherical colloidal silica (CS) particles with a diameter of 15 ± 5 nm were modified with three different types of monofunctional silane coupling agents to prepare functionalized colloidal silica (FCS) particles. The effects of the surface chemistry of the FCS were studied as a function of the CS/FCS loading in the poly(dimethyl siloxane) (PDMS) polymer. The prepared PDMS-CS/FCS composites were investigated for their physical properties both in the cured and uncured states. The extent of filler-filler and filler-polymer interactions was found to vary with the type of functionalizing agent used to treat the surface of the CS. The filler-filler interaction appeared to be predominant in the PDMS-CS composites, and improved filler-polymer interaction was indicated in the case of the PDMS-FCS composites. The composites containing CS treated with methyltrimethoxysilane exhibited relatively better optical and mechanical properties compared to the other PDMS-FCS composites. This study highlighted the importance of judiciously choosing functionalizing agents to achieve PDMS-FCS composites with predetermined optical and mechanical properties.

Original languageEnglish
JournalJournal of Applied Polymer Science
Volume126
Issue number5
DOIs
Publication statusPublished - 05-12-2012

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Siloxanes
Silicon Dioxide
Nanocomposites
Silica
Fillers
Composite materials
Polymers
Optical properties
Silanes
Mechanical properties
Coupling agents
Surface chemistry

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

Cite this

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abstract = "Aqueous spherical colloidal silica (CS) particles with a diameter of 15 {\^A}± 5 nm were modified with three different types of monofunctional silane coupling agents to prepare functionalized colloidal silica (FCS) particles. The effects of the surface chemistry of the FCS were studied as a function of the CS/FCS loading in the poly(dimethyl siloxane) (PDMS) polymer. The prepared PDMS-CS/FCS composites were investigated for their physical properties both in the cured and uncured states. The extent of filler-filler and filler-polymer interactions was found to vary with the type of functionalizing agent used to treat the surface of the CS. The filler-filler interaction appeared to be predominant in the PDMS-CS composites, and improved filler-polymer interaction was indicated in the case of the PDMS-FCS composites. The composites containing CS treated with methyltrimethoxysilane exhibited relatively better optical and mechanical properties compared to the other PDMS-FCS composites. This study highlighted the importance of judiciously choosing functionalizing agents to achieve PDMS-FCS composites with predetermined optical and mechanical properties.",
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Preparation and properties of poly(dimethyl siloxane)-colloidal silica/functionalized colloidal silica nanocomposites. / Dinkar, Sumi; Dhanabalan, A.; Thimmappa, B. H.S.

In: Journal of Applied Polymer Science, Vol. 126, No. 5, 05.12.2012.

Research output: Contribution to journalArticle

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