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Apatite-forming ability and mechanical properties of PTMO-modified CaO–SiO2 hybrids prepared by sol–gel processing: effect of CaO and PTMO contents

Paper ID Volume ID Publish Year Pages File Format Full-Text
13706 892 2002 8 PDF Available
Title
Apatite-forming ability and mechanical properties of PTMO-modified CaO–SiO2 hybrids prepared by sol–gel processing: effect of CaO and PTMO contents
Abstract

Transparent monolithics of triethoxysilane end-capped poly(tetramethylene oxide) (Si-PTMO)-modified CaO–SiO2 hybrids were successfully synthesized by hydrolysis and polycondensation of Si-PTMO, tetraethoxysilane (TEOS) and calcium nitrate. As for the samples with varying (Ca(NO3)2)/(TEOS) molar ratios under constant ratio of (Si-PTMO)/(TEOS) of 2/3 in weight, the apatite-forming ability in a simulated body fluid (SBF) which is indicative of bioactivity, remarkably increased with increasing CaO content, although the tensile strength and Young's modulus decreased. The hybrid with (Ca(NO3)2)/(TEOS)=0.15 in mol formed an apatite on its surface within only 1 day. For this series of samples, the strain at failure which is a measure of capability for deformation of material, was found to be about 30% and almost independent of CaO content. As for the samples with varying (Si-PTMO)/(TEOS) weight ratios under constant ratio of (Ca(NO3)2)/(TEOS) of 0.15 in mol, the strain at failure increased with increasing Si-PTMO content, but the apatite-forming ability, tensile strength and Young's modulus decreased. Thus, the synthesis of the hybrids exhibiting both high apatite-forming ability and high extensibility can be achieved by selecting suitable CaO and Si-PTMO contents. These new kind of hybrid materials may be useful as bioactive bone-repairing materials.

Keywords
Organic–inorganic hybrids; Poly(tetramethylene oxide); Apatite-forming ability; Bioactivity; Mechanical properties
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Apatite-forming ability and mechanical properties of PTMO-modified CaO–SiO2 hybrids prepared by sol–gel processing: effect of CaO and PTMO contents
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 23, Issue 14, July 2002, Pages 3033–3040
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us