Document Detail

Longitudinal acoustic properties of poly(lactic acid) and poly(lactic-co-glycolic acid).
MedLine Citation:
PMID:  20826909     Owner:  NLM     Status:  In-Process    
Acoustics offers rich possibilities for characterizing and monitoring the biopolymer structures being employed in the field of biomedical engineering. Here we explore the rudimentary acoustic properties of two common biodegradable polymers: poly(lactic acid) and poly(lactic-co-glycolic acid). A pulse-echo technique is developed to reveal the bulk speed of sound, acoustic impedance and acoustic attenuation of small samples of the polymer across a pertinent temperature range of 0-70 °C. The glass transition appears markedly as both a discontinuity in the first derivative of the speed of sound and a sharp increase in the acoustic attenuation. We further extend our analysis to consider the role of ethanol, whose presence is observed to dramatically modify the acoustic properties and reduce the glass transition temperature of the polymers. Our results highlight the sensitivity of acoustic properties to a range of bulk properties, including visco-elasticity, molecular weight, co-polymer ratio, crystallinity and the presence of plasticizers.
N G Parker; M L Mather; S P Morgan; M J W Povey
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-09-09
Journal Detail:
Title:  Biomedical materials (Bristol, England)     Volume:  5     ISSN:  1748-605X     ISO Abbreviation:  Biomed Mater     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-09-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101285195     Medline TA:  Biomed Mater     Country:  England    
Other Details:
Languages:  eng     Pagination:  055004     Citation Subset:  IM    
School of Food Science and Nutrition, University of Leeds, Leeds, UK.
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MeSH Terms
Grant Support
BB/F004923/1//Biotechnology and Biological Sciences Research Council

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