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Strain-Based Temperature Memory Effect for Nafion and Its Molecular Origins

机译：Nafion的基于应变的温度记忆效应及其分子起源

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摘要

A shape memory polymer traditionally refers to a polymer that can memorize one temporary shape and recover to its permanent shape upon exposure to an external stimulus. Although this basic concept has been known for at least half a century, recent advances have led to the discoveriy of previously uncovered memory properties that challenge the traditional concept of shape memory polymers. In particular, a temperature memory effect refers to the capability of a polymer to memorize temperatures instead of shapes. Thus far, the reported temperature memory effect has been established under iso-strain stress recovery conditions, in which the maximum recovery stress appears at a temperature roughly identical to the deformation temperature. This effect can be called recovery stress based temperature memory effect. In this work, experiments were designed in an attempt to establish a temperature memory effect based on the stress free strain recovery behaviors of Nafion. The results show that, under carefully selected conditions, the temperature at which a maximum strain recovery rate is observed can indeed be quantitatively related to the deformation temperature. In addition, indications that the polymer is capable of memorizing more than one deformation temperature (i.e., multi-temperature memory effect) are shown. The molecular origin of Nafion's temperature memory effect is elucidated through small angle neutron scattering study.
机译：传统上，形状记忆聚合物是指可以记忆一种临时形状并在暴露于外部刺激后恢复其永久形状的聚合物。尽管这个基本概念至少已经被人们知道了半个世纪了，但是最近的进展导致发现了以前发现的记忆特性，这些特性对形状记忆聚合物的传统概念提出了挑战。特别地，温度记忆效应是指聚合物记忆温度而不是形状的能力。到目前为止，已经在等应变应力恢复条件下建立了报道的温度记忆效应，其中最大恢复应力出现在与变形温度大致相同的温度下。这种效应可以称为基于恢复应力的温度记忆效应。在这项工作中，设计了一些实验来尝试基于Nafion的无应力应变恢复行为来建立温度记忆效应。结果表明，在精心选择的条件下，观察到最大应变恢复率的温度确实可以与变形温度定量相关。另外，显示了聚合物能够记忆多于一个变形温度的指示（即，多温度记忆效应）。通过小角度中子散射研究阐明了Nafion温度记忆效应的分子起源。

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  • 来源
    《Advanced Functional Materials》 |2011年第11期|p.2057-2066|共10页
  • 作者

    Tao Xie; Kirt A. Page; Scott A. Eastman;

  • 作者单位

    Chemical Sciences and Materials Systems Laboratory General Motors Research & Development Center Mail Code: 480-106-224 30500 Mound Road, Warren, Ml 48090-9055, U.S.A;

    National Institute of Standards and Technology Materials Science and Engineering Laboratory Polymers Division, Gaithersburg, MD 20899-8540, U.S.A;

    National Institute of Standards and Technology Materials Science and Engineering Laboratory Polymers Division, Gaithersburg, MD 20899-8540, U.S.A;

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