Morphology of ethylene-propylene copolymer based ionomers as studied by solid state NMR and small angle X-ray scattering in relation to some mechanical properties
Morphology of ethylene-propylene copolymer based ionomers as studied by solid state NMR and small angle X-ray scattering in relation to some mechanical properties
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DOI：
10.1021/ma020358a
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发表时间：
2003-01
期刊：
影响因子：
5.5
通讯作者：
M. Wouters;V. Litvinov;Fl Binsbergen;Jgp Han Goossens;V. Duin;Hg Dikland
中科院分区：
文献类型：
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作者：
M. Wouters;V. Litvinov;Fl Binsbergen;Jgp Han Goossens;V. Duin;Hg Dikland
通过使用小角 X 射线散射 (SAXS) 和固态 NMR 实验研究了基于无定形马来化乙烯-丙烯共聚物的离聚物的微相结构。结果表明，在这种接枝马来酸酐的离聚物中，其与 Zn2+ 的盐和一小部分 EPM 链片段形成固定的、富含离子的聚集体。在离聚物和离聚物前体中检测到三种类型的具有不同迁移率的EPM链单元，这可归因于具有低迁移率的链单元形成被界面层包围的聚集体、将这些聚集体互连的EPM网络链以及诸如悬空末端和链环等网络缺陷。当中和度增加时，固定聚集体的平均尺寸几乎保持不变，而流动性受限的界面层的厚度略有增加。与其他离聚物相比，MAn-g-EPM 离聚物中的聚集体尺寸明显更大......
The microphase structure of ionomers based on an amorphous, maleated ethylene−propylene copolymer was investigated by using small-angle X-ray scattering (SAXS) and solid-state NMR experiments. It was shown that in this kind of ionomers grafted maleic anhydride, its salts with Zn2+ and a fraction of EPM chain fragments form immobilized, ion-rich aggregates. Three types of EPM chain units with different mobility were detected in the ionomers and in the ionomer precursor, which can be attributed to chain units with low mobility forming aggregates surrounded by an interfacial layer, EPM network chains interconnecting these aggregates, and network imperfections such as dangling ends and chain loops. When the the degree of neutralization is increased, the average dimension of the immobilized aggregate remains almost constant, while the thickness of the interfacial layer with restricted mobility slightly increases. The size of the aggregates in MAn-g-EPM ionomers is significantly larger compared to other ionomer...