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Second glass transition in weakly clustered poly(styrene-co-itaconate) ionomers

机译：弱簇聚（苯乙烯-衣康酸酯）离聚物的第二次玻璃化转变

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摘要

Since their appearance ca. 35 years ago, ionomers have been studied widely because they exhibit unique physical properties due to the ionic interaction. According to the multiplet/cluster model for random amorphous ionomers, ionic aggregates (multiplets) restrict the mobility of polymer chain segments surrounding them. When an ion concentration increases, the number of multiplet increases. Consequently, the size of regions of restricted mobility also increases, and the regions start to overlap. Above a certain ion content, the overlapping regions of reduced mobility become large enough to have their own glass transition; the regions are now called clusters. At that point, the ionomer starts to show two glass transitions (T_gS); the T_g at low temperature is due to the matrix glass transition, and the T_g at high temperature to the cluster glass transition.
机译：由于其外观35年前，对离聚物进行了广泛的研究，因为它们由于离子相互作用而表现出独特的物理性能。根据无规无定形离聚物的多重/簇模型，离子聚集体（多重）限制了围绕它们的聚合物链段的迁移。当离子浓度增加时，多重数增加。因此，移动受限的区域的大小也增加，并且这些区域开始重叠。高于一定的离子含量，迁移率降低的重叠区域变得足够大，可以具有自己的玻璃化转变。这些区域现在称为簇。此时，离聚物开始显示出两个玻璃化转变（T_gS）;低温下的T_g是由于基体玻璃化转变，高温下的T_g是由于簇玻璃化转变。

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