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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >A study of the water sorption kinetic of Poly(HEMA) hydrogels by SLAM and FT-IR measurements
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A study of the water sorption kinetic of Poly(HEMA) hydrogels by SLAM and FT-IR measurements

机译：通过SLAM和FT-IR测量研究Poly（HEMA）水凝胶的水吸附动力学

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摘要

The relative changes in the ultrasonic attenuation measured by scanning laser acoustic microscopy (SLAM) during water sorption in poly-hydroxy-ethil-methacrilate[Poly(HEMA)] are analyzed. Acoustical images performed at 10 and 30 MHz of Poly(HEMA) during water absorption show an ultrasonic attenuation increase followed by a decrease. This phenomenon is analyzed in terms of reflections, scattering, and absorption of the acoustic waves. However, the contribution of scattering and reflection may be neglected and the time dependence of acoustic attenuation is attributed to absorption of the acoustic waves occuring in accordance with the glass transition, although induced by a solvent and not by temperature. Fourier transform infrared spectrometry (FT-IR) measurements indicate that bound water is responsible for the glass-rubber transition. On the other hand, the longitudinal velocity changes are only affected by the variations of density and mechanical properties of the polymer during water sorption. The traditional weight gain data are compared with the attenuation changes observed by ultrasonic measurements.
机译：分析了在多羟基乙氧基甲基丙烯酸酯[Poly（HEMA）]吸水过程中通过扫描激光声学显微镜（SLAM）测量的超声衰减的相对变化。吸水期间在Poly（HEMA）的10和30 MHz处执行的声像显示超声衰减先增加后降低。从声波的反射，散射和吸收方面分析了这种现象。然而，散射和反射的贡献可以忽略，并且声衰减的时间依赖性归因于根据玻璃化转变发生的声波的吸收，尽管是由溶剂而不是由温度引起的。傅立叶变换红外光谱（FT-IR）测量表明结合水是玻璃-橡胶转变的原因。另一方面，纵向速度变化仅受吸水期间聚合物的密度和机械性能的变化影响。将传统的体重增加数据与通过超声测量观察到的衰减变化进行比较。

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