Preparation and Properties of Poly(dimethyl siloxane)– Colloidal Silica/Functionalized Colloidal Silica Nanocomposites

Dinkar, S and Dhanabalan, A and Thimmappa, B H S (2012) Preparation and Properties of Poly(dimethyl siloxane)– Colloidal Silica/Functionalized Colloidal Silica Nanocomposites. Journal of Applied Polymer Science, 126. pp. 1585-1592. ISSN 1097-4628

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Abstract

Aqueous spherical colloidal silica (CS) particles with a diameter of 15 6 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.

Item Type: Article
Uncontrolled Keywords: composites; mechanical properties; polysiloxanes
Subjects: Engineering > MIT Manipal > Chemistry
Depositing User: MIT Library
Date Deposited: 28 Aug 2013 09:29
Last Modified: 16 Sep 2013 06:08
URI: http://eprints.manipal.edu/id/eprint/136964

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