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首页> 外文期刊>Journal of Applied Polymer Science >Physicomechanical and dielectric properties of magnesium and barium ionomers based on sulfonated maleated styrene-ethylene/butylene-styrene block copolymer
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Physicomechanical and dielectric properties of magnesium and barium ionomers based on sulfonated maleated styrene-ethylene/butylene-styrene block copolymer

机译：基于磺化马来酸化苯乙烯-乙烯/丁烯-苯乙烯嵌段共聚物的镁和钡离聚物的物理力学和介电性能

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Ionomers, containing both carboxylate and sulfonate anions on the polymer backbone, based on metal cations like Mg+2 and Ba+2 were prepared by sulfonating maleated styrene-ethylene/butylene-styrene block copolymer, hereafter referred to as m-SEBS, followed by its neutralization by metal acetates. Infrared spectroscopic studies reveal that sulfonation reaction takes place in the para position of the benzene rings of polystyrene blocks and metal salts are formed on neutralization of the precursor acids. Dynamic mechanical thermal analyses show that sulfonation causes increase in T-g of the rubbery phase of m-SEBS and decrease in tan delta at T-g of the hard phase, along with formation of a rubbery plateau. The changes become more pronounced on neutralization of the sulfonated maleated SEES, and the effect is greater in the case of Ba salt. Dielectric thermal analyses (DETA) show that incorporation of ionic groups causes profound changes in the dielectric constant (epsilon') of m-SEBS. In addition to the low temperature glass-rubber transition, the plot of epsilon' vs, temperature shows occurrence of a high-temperature transition, also known as the ionic transition. Activation energy for the dielectric relaxation could be determined on the basis of frequency dependence of the ionic transition temperature. Two values of the activation energy for the dielectric relaxation refer to the presence of two types of ionic aggregates, namely multiplets and clusters. Incorporation of the ionic groups causes enhancement in stress-strain properties as well as retention of the properties at elevated temperatures (50 degrees and 75 degrees C), and the effect is more pronounced in the case of Ba ionomer. Although sulfonated ionomers show greater strength than the carboxylated ionomers, the sulfonated maleated ionomers show higher stress-strain properties in comparison to both sulfonated and carboxylated ionomers. (C) 2000 John Wiley & Sons, Inc. [References: 37]
机译：通过磺化马来酸化的苯乙烯-乙烯/丁烯-苯乙烯嵌段共聚物（以下简称为m-SEBS），制备基于金属阳离子（如Mg + 2和Ba + 2）的聚合物主链上同时包含羧酸根和磺酸根阴离子的离聚物通过金属乙酸盐中和。红外光谱研究表明，磺化反应发生在聚苯乙烯嵌段的苯环的对位，金属盐在中和前体酸时形成。动态机械热分析表明，磺化会导致m-SEBS的橡胶相的T-g升高，而在硬相的T-g处的tanδ降低，并形成橡胶平台。在中和磺化马来酸化的SEES时，变化变得更加明显，并且在Ba盐的情况下效果更大。介电热分析（DETA）表明，离子基团的引入引起m-SEBS介电常数（ε）的深刻变化。除了低温玻璃-橡胶转变，ε与温度的关系图还显示了高温转变的发生，也称为离子转变。可以基于离子转变温度的频率依赖性来确定用于介电弛豫的活化能。用于介电弛豫的活化能的两个值是指两种类型的离子聚集体的存在，即多重态和簇态。离子基团的引入引起应力-应变性能的增强以及在高温（50℃和75℃）下性能的保持，并且在Ba离聚物的情况下效果更加明显。尽管磺化离聚物显示出比羧化离聚物更高的强度，但是与磺化和羧化离聚物相比，磺化马来酸化离聚物显示出更高的应力应变性质。 （C）2000 John Wiley＆Sons，Inc. [参考：37]

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