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Synthesis of new organic–inorganic hybrids poly[2-hydroxethyl methacrylate (HEMA)-glycidyl methacrylate (GMA)-silica] and their mechanical properties

Published online by Cambridge University Press:  31 January 2011

Shuxi Li ,
Solomon Praveen Samuel ,
Andreas Mylonakis ,
Apoorva Shah ,
Alex Hsieh ,
Alpa Patel ,
Elizabeth Wei ,
George Baran  and
Yen Wei
Shuxi Li
Affiliation:
Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104
Solomon Praveen Samuel
Affiliation:
Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104
Andreas Mylonakis
Affiliation:
Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104
Apoorva Shah
Affiliation:
Triton Systems Inc., Chelmsford, Massachusetts 01824
Alex Hsieh
Affiliation:
Army Research Laboratory, AMSRD-ARL-WM-MD, Aberdeen Proving Ground, Maryland 21005
Alpa Patel
Affiliation:
Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104
Elizabeth Wei
Affiliation:
Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104
George Baran
Affiliation:
Department of Mechanical Engineering, Temple University, Philadelphia, Pennsylvania 19122
Yen Wei*
Affiliation:
Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The presence of low-molecular-weight by-products is a major problem in poly[2-hydroxethyl methacrylate (HEMA)-silica] hybrids prepared using sol-gel synthesis. Low-molecular-weight by-products have a detrimental effect on the optical transparency, and mechanical and storage properties of poly(HEMA-silica) hybrids. To solve this problem, a new sol-gel synthesis procedure was developed to prepare organic–inorganic hybrids. Glycidyl methacrylate (GMA) was used as a comonomer to form poly(HEMA-GMA-silica) (PHGS) hybrids. In addition to forming a copolymer, GMA has two more functions. It facilitates the removal of almost all of the low-molecular-weight by-product molecules formed during sol-gel synthesis and also prevents further condensation of free silanol groups during the polymerization, storage, and use. The mechanical properties of PHGS hybrids were evaluated by using compression testing. The mechanical properties of PHGS hybrids were higher compared to Plexiglas G poly(methyl methacrylate), and the hybrids can be synthesized with reproducible mechanical properties.

Keywords

PolymerSol-gelStrength
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 1 , January 2008 , pp. 66 - 71
Copyright
Copyright © Materials Research Society 2008

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