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Microhardness of starch based biomaterials in simulated physiological conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
2568 116 2007 8 PDF Available
Title
Microhardness of starch based biomaterials in simulated physiological conditions
Abstract

In this work the variation of the surface mechanical properties of starch-based biomaterials with immersion time was followed using microhardness measurements. Two blends with very distinct water uptake capabilities, starch/cellulose acetate (SCA) and starch/poly(ε-caprolactone) (SPCL), were immersed in a phosphate buffer solution (PBS) at 37.5 °C for various times. The microhardness of the blends decreased significantly (∼50% for SPCL and ∼94% for SCA), within a time period of 30 days of immersion, reflecting the different hydrophilic character of the synthetic components of the blends. The dependence of microhardness on the applied loading time and load was also analysed and showed a power law dependency for SCA. Water uptake and weight loss measurements were performed for the same immersion times used in the microhardness experiments. The different swelling/degradation behaviour presented by the blends was related to the respective variation in microhardness. Moreover, complementary characterization of the mechanical properties of SCA and SPCL was accomplished by dynamic mechanical analysis (DMA) and creep measurements. Microhardness measurements proved to be a useful technique for characterizing the mechanical behaviour near the surface of polymeric biomaterials, including in simulated physiological conditions.

Keywords
Microhardness; Starch blends; Swelling; in vitro degradation; Mechanical properties
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Publisher
Database: Elsevier - ScienceDirect
Journal: Acta Biomaterialia - Volume 3, Issue 1, January 2007, Pages 69–76
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