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Preparation and mechanical properties of nanocomposites of poly(d,l-lactide) with Ca-deficient hydroxyapatite nanocrystals

Paper ID Volume ID Publish Year Pages File Format Full-Text
13517 868 2001 7 PDF Available
Title
Preparation and mechanical properties of nanocomposites of poly(d,l-lactide) with Ca-deficient hydroxyapatite nanocrystals
Abstract

Nanocomposites of high molecular poly(d,l-lactide) (PLA) with Ca-deficient hydroxyapatite nanocrystals (d-HAP) were successfully prepared through solvent-cast technique. Such composites are of great importance to make bone-like substitutes as d-HAP nanocrystals have similar composition, morphology and crystal structure as natural apatite crystals. Of all the PLA solvents studied, N,N-dimethylformamide is the best one to disperse d-HAP nanocrystals. The resultant sol is a blue, stable dispersion that could preserve several days with only slight precipitation. The bright-field TEM micrograph shows that d-HAP nanocrystals form homogeneous dispersion in the PLA matrix at a microscopic level. The tensile modulus for PLA/d-HAP nanocomposites increases with d-HAP loading. Theoretical prediction of the modulus has been made by assuming the nanocomposites as short fiber filled systems. The calculated values based on Halpin–Tsai equations show excellent agreement with the experimental results. The yield stress for the nanocomposites has not been undermined by the presence of the nanocrystals. This preservation of strength for PLA/d-HAP nanocomposites may be due to the homogeneous dispersion of d-HAP nanocrystals in the PLA matrix as well as the good interfacial adhesion.

Keywords
Nanocomposites; Poly(d,l-lactide); Ca-deficient hydroxyapatite nanocrystals
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Preparation and mechanical properties of nanocomposites of poly(d,l-lactide) with Ca-deficient hydroxyapatite nanocrystals
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 22, Issue 21, November 2001, Pages 2867–2873
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