Investigations of the high-frequency dynamic properties of polymeric systems with quartz crystal resonators
Investigations of the high-frequency dynamic properties of polymeric systems with quartz crystal resonators
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DOI：
10.1116/1.5142762
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发表时间：
2020-03-01
期刊：
影响因子：
2.1
通讯作者：
Wang Qifeng
中科院分区：
文献类型：
--
作者：
Shull, Kenneth R.;Taghon, Meredith;Wang Qifeng
从使用的流变石英晶体微天平（RheoQCM）作为一个固定频率的流变仪在15 MHz的操作所产生的机会进行了讨论。该技术需要使用特定厚度范围内的薄膜，该厚度范围取决于感兴趣材料的机械性能。一个政权地图量化适当的厚度，开发的基础上，一个高度交联的环氧树脂样品，这是一个广泛的一类聚合物材料的代表性的属性。测量的膜特性的相对误差通常在百分之几或更小的范围内，并且通过使用幂律模型来使石英晶体的两个不同谐振谐波处的流变特性相关而最小化。通过测量聚苯乙烯和聚（甲基丙烯酸甲酯）在玻璃化转变附近的温度和分子量相关的性能，说明了RheoQCM技术的应用。
Opportunities arising from the use of the rheometric quartz crystal microbalance (RheoQCM) as a fixed frequency rheometer operating at 15 MHz are discussed. The technique requires the use of films in a specified thickness range that depends on the mechanical properties of the material of interest. A regime map quantifying the appropriate thicknesses is developed, based on the properties of a highly crosslinked epoxy sample that is representative of a broad class of polymeric materials. Relative errors in the measured film properties are typically in the range of several percent or less and are minimized by using a power law model to relate the rheological properties at two different resonant harmonics of the quartz crystal. Application of the RheoQCM technique is illustrated by measuring the temperature- and molecular weight-dependent properties of polystyrene and poly(methyl methacrylate) in the vicinity of the glass transition.