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The mechanical properties and bioactivity of poly(methyl methacrylate)/SiO2–CaO nanocomposite

Paper ID Volume ID Publish Year Pages File Format Full-Text
10301 678 2009 6 PDF Available
Title
The mechanical properties and bioactivity of poly(methyl methacrylate)/SiO2–CaO nanocomposite
Abstract

The mechanical properties and bioactivity of poly(methyl methacrylate)/SiO2–CaO nanocomposite were investigated using dimethyldiethoxysilane (DMDES) and tetraethoxysilane (TEOS), which could produce two and four siloxane linkages, respectively, after a sol–gel reaction. Methyl methacrylate was co-polymerized with 3-(trimethoxysilyl)propyl methacrylate and then co-condensed with DMDES (specimen D) and TEOS (specimen T), respectively, with calcium nitrate tetrahydrate under acidic conditions. The fracture toughness of specimen D was much improved compared to that of specimen T, whereas its fracture strength, hardness, and apatite-forming ability in simulated body fluid (SBF) were slightly decreased. The improved fracture toughness of specimen D without losing apatite-forming ability was explained by the decrease of siloxane linkage numbers and the introduction of alkyl groups in silica structure because covalently bonded siloxane linkages produce hard and brittle fracture behavior in the nanocomposite while the alkyl groups help to make the silica as linear chain structure. The practical implication of these results is that this new nanocomposite can be applied to the filler materials for bone cement and dental composite resin because of its good bioactivity and improved mechanical properties.

Keywords
PMMA; SiO2–CaO; Siloxane linkage; Fracture toughness; Bioactivity
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The mechanical properties and bioactivity of poly(methyl methacrylate)/SiO2–CaO nanocomposite
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 30, Issue 20, July 2009, Pages 3444–3449
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