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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >The development of shear and compression elastic moduli in curing epoxy adhesives measured using non-contact ultrasonic transducers
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The development of shear and compression elastic moduli in curing epoxy adhesives measured using non-contact ultrasonic transducers

机译：使用非接触式超声传感器测量固化环氧胶粘剂中的剪切和压缩弹性模量

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Thin epoxy resin adhesive samples were ultrasonically measured during cure using normal incidence radially polarized shear wave electromagnetic acoustic transducers (EMATs). Although the EMATs used predominantly generated shear waves (SH) they were designed so that they also generated/detected compression waves allowing the simultaneous measurement of shear and compression wave propagation through a curing polymer in a non-contact regime. The adhesive thickness examined in the experiments was approximately I mm, which was optimal for experimental measurement using our apparatus. The epoxy resin systems (rapid cure and a standard cure) described in this paper were supplied in a two-part cartridge form, mixed by injection through a mixing nozzle. Five different samples have been investigated at this stage, and there appears to be a fundamental difference in the way that the elastic moduli develop in the rapid cure and longer cure time epoxies. This can possibly be explained in terms of the reaction kinetics and the development of the structure on a microscopic scale. The rapid cure systems initially develop a shear elastic modulus at a faster rate which suddenly decreases at approximately the same time that the temperature of the adhesive reaches its maximum value during the exothermic reaction. This is consistent with an initial rapid reaction rate which is then greatly reduced as the remaining un-reacted polymer chains require a finite time to move into a position where they can react and join the network. [References: 20]
机译：使用法向入射径向极化剪切波电磁声换能器（EMAT）在固化过程中超声测量环氧树脂薄粘合剂样品。尽管EMAT主要使用产生的剪切波（SH），但它们的设计方式还使其产生/检测到压缩波，从而可以同时测量剪切波和压缩波在非接触状态下通过固化聚合物的传播。在实验中检查的粘合剂厚度约为1毫米，这对于使用我们的设备进行实验测量是最佳的。本文所述的环氧树脂体系（快速固化和标准固化）以两部分装的形式提供，通过混合喷嘴注入进行混合。在此阶段已经研究了五个不同的样品，并且在快速固化和较长固化时间的环氧树脂中，弹性模量的发展方式似乎存在根本差异。这可以用反应动力学和微观结构的发展来解释。快速固化系统最初以更快的速度产生剪切弹性模量，该剪切弹性模量在放热反应期间在粘合剂温度达到其最大值的大约同一时间突然降低。这与最初的快速反应速率是一致的，该速率随后由于剩余的未反应的聚合物链需要有限的时间才能移动到可以反应并加入网络的位置而大大降低。 [参考：20]

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