EFFECT OF METAL CATION TYPE ON THE STRUCTURE AND PROPERTIES OF ETHYLENE IONOMERS
EFFECT OF METAL CATION TYPE ON THE STRUCTURE AND PROPERTIES OF ETHYLENE IONOMERS
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DOI：
10.1002/app.1991.070420207
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发表时间：
1991-01-20
影响因子：
3
通讯作者：
YANO, S
中科院分区：
文献类型：
--
作者：
HIRASAWA, E;YAMAMOTO, Y;YANO, S
通过DSC测量了聚乙烯-共-甲基丙烯酸（EMAA）的Na+、K+、Mg 2+、Zn 2+、Cu 2+、Mn 2+和Co 2+盐的热性能、刚度、熔体粘度、拉伸性能和动态力学性能。 随着中和度的增加，碱金属和碱土金属盐的结构和性质的变化比过渡金属盐更大。 在碱金属和碱土金属盐中，刚度在33%中和时显示出最大值，而在过渡金属盐中，在高达60%中和时没有发现最大值。 在碱金属盐和碱土金属盐中均观察到盐基聚集体的微相分离，但在过渡金属盐中未观察到。 这些差异归因于较强的离子相互作用和大量的羧基基团与碱金属和碱土金属盐的离子盐基团（离子微晶）的有序结构。 在低应变下测量的机械性能，如刚度和屈服应力，强烈地依赖于离子微晶的结晶顺序的程度。 高应变性能，如拉伸强度和断裂伸长率，取决于离子相互作用的强度和阳离子的价态。
Thermal properties by DSC, stiffness, melt viscosity, tensile properties, and dynamic mechanical properties were measured for the Na+, K+, Mg2+, Zn2+, Cu2+, Mn2+, and Co2+ salts of poly-ethylene-co-methacrylic acid) (EMAA). The changes in the structure and properties with increasing neutralization are larger in the alkaline and alkaline earth metal salts than in the transition metal salts. The stiffness shows a maximum at 33% neutralization in both the alkaline and alkaline earth metal salts, while no maxima are found up to 60% neutralization in the transition metal salts. The microphase separation of salt group aggregates is observed in both the alkaline and alkaline earth metal salts, but is not seen in the transition metal salts. These differences were attributed to both the stronger ionic interactions and the larger number of carboxyl groups associated with the alkaline and alkaline earth metal salts in the ordered structure of ionic salt groups (ionic crystallites). The mechanical properties measured at low strain, such as stiffness and yield stress, strongly depend on the degree of the crystalline order of the ionic crystallites. The high-strain properties, such as tensile strength and elongation at break, depend on the strength of the ionic interactions and the valence of the cation.