Physics – Condensed Matter – Materials Science
Scientific paper
2010-05-24
N G Parker et al 2010 Biomed. Mater. 5 055004
Physics
Condensed Matter
Materials Science
14 pages, 7 figures
Scientific paper
10.1088/1748-6041/5/5/055004
Acoustics offers rich possibilities for characterising 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- 70oC. 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.
Mather Melissa L.
Morgan Simon P.
Parker N. G.
Povey M. JW
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