SIZES AND STABILITIES OF MULTIPLETS AND CLUSTERS IN CARBOXYLATED AND SULFONATED STYRENE IONOMERS
SIZES AND STABILITIES OF MULTIPLETS AND CLUSTERS IN CARBOXYLATED AND SULFONATED STYRENE IONOMERS
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DOI：
10.1021/ma00050a013
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发表时间：
1992-11-23
期刊：
影响因子：
5.5
通讯作者：
EISENBERG, A
中科院分区：
文献类型：
--
作者：
HIRD, B;EISENBERG, A
研究了一些无规苯乙烯离聚物的机械性能，以确定离子基团类型及其相对于聚合物骨架的位置的影响。以往的研究表明，增加离子对的距离从聚合物主链导致更大的多重峰和更大的多重峰间距在无规苯乙烯离聚物。在这项研究中，相对于聚合物骨架的离子对的位置被证明对材料的机械性能有深远的影响。 这是由于不同程度的空间位阻离子对聚集在每个离聚物的形态差异。 离子基团之间的静电相互作用的强度取决于离子种类的类型。离子对之间的强静电相互作用往往会产生相对稳定的多重态，即使在相对较高的温度下也会起到交联作用。在橡胶态区域中的材料的模量保持恒定，而多重态是稳定的，但随着离子跳跃的开始而降低。这为离子跳跃动力学提供了一些见解。
The mechanical properties of some random styrene ionomers are investigated in order to determine the effects of the type of the ionic groups and their position relative to the polymer backbone. Previous studies have shown that increasing the distance of the ion pairs from the polymer backbone leads to larger multiplets and greater intermultiplet spacings in random styrene ionomers. In this study, the position of the ion pairs relative to the polymer backbone is shown to have a profound influence on the mechanical properties of the material. This is attributed to differences in morphology resulting from different extents of steric hindrance to ion-pair aggregation in each ionomer. The strength of the electrostatic interactions between ionic groups is governed by the type of the ionic species. Strong electrostatic interactions between ion pairs tend to give rise to relatively stable multiplets which act as cross-links even at relatively high temperatures. The modulus of the material in the rubbery region remains constant while the multiplets are stable but decreases with the onset of ion hopping. This provides some insight into ion-hopping kinetics.