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首页> 外文期刊>Journal of Thermal Analysis and Calorimetry >A dielectric study of poly(vinyl acetate) using a pulse-probe technique
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A dielectric study of poly(vinyl acetate) using a pulse-probe technique

机译：使用脉冲探针技术对聚醋酸乙烯酯进行介电研究

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摘要

There is considerable literature available that describes our understanding of the viscoelastic properties of polymers subjected to mechanical stresses or deformations. What we refer to here as a pulse-probe technique is one method that is commonly used to study the time-dependent behavior of materials in histories, e.g., temperature-jump or step-deformations, that exhibit fading memory responses. In the linear case the behavior is well understood in the context of Boltzmann superposition ideas. However, there is only limited work available that investigates the dielectric response of materials within this same context. In the present study, we present an investigation of the dielectric behavior of poly(vinyl acetate) (PVAc) using a two-step pulse-probe technique. Time domain dielectric experiments were performed in the vicinity of the glass transition temperature. After establishing the linear response function in single-step experiments, two types of pulse-probe experiments were performed. In one, the time duration t 1 of the first step in the probe was varied. In the second case, the magnitude of the field E 1 applied to the sample for the first step was varied. We not only demonstrate the existence of the memory effect in the dielectric response, but also find that the responses are consistent with the linear Boltzmann superposition principle. Evidence of deviations from linear superposition at the highest electric fields is also presented.
机译：有大量可用的文献描述了我们对承受机械应力或变形的聚合物的粘弹性的理解。我们在这里所说的脉冲探针技术是一种通常用于研究历史中材料随时间变化的行为的方法，例如温度跃变或阶跃变形，它们表现出逐渐消失的记忆响应。在线性情况下，这种行为在玻耳兹曼叠加思想的背景下得到了很好的理解。但是，在这种情况下，研究材料介电响应的工作很少。在本研究中，我们使用两步脉冲探针技术对聚醋酸乙烯酯（PVAc）的介电性能进行了研究。在玻璃化转变温度附近进行时域介电实验。在单步实验中建立线性响应函数后，进行了两种类型的脉冲探针实验。在一个步骤中，探针第一步的持续时间t 1 发生了变化。在第二种情况下，第一步所施加的电场E 1 的大小发生变化。我们不仅证明了介电响应中存在记忆效应，而且还发现该响应与线性玻尔兹曼叠加原理一致。还提供了在最高电场下线性叠加偏差的证据。

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