聚乳酸和乳酸-羟基乙酸共聚物的纵向声学性能
Longitudinal acoustic properties of poly(lactic acid) and poly(lactic-co-glycolic acid)
摘要：
声学为生物医学工程领域中使用的生物聚合物结构的表征和监测提供了丰富的可能性。在这里，我们探讨了两种常见的可生物降解聚合物聚（乳酸）和聚（乳酸-羟基乙酸共聚物）的基本声学性能。脉冲回波技术的发展，以揭示体积声速，声阻抗和声衰减的小样品的聚合物在一个相关的温度范围内的0- 70 ℃。玻璃化转变明显地表现为声速的一阶导数的不连续性和声衰减的急剧增加。我们进一步扩展我们的分析，考虑乙醇的存在下观察到显着修改的声学性能和降低聚合物的玻璃化转变温度的作用。我们的研究结果突出了声学性能的灵敏度，一系列的散装性能，包括粘弹性，分子量，共聚物的比例，结晶度和增塑剂的存在下。
英文摘要：
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.
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