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首页> 外文期刊>Applied Surface Science >Dielectric properties of a hydrated sulfonated poly(styrene-ethylene/butylenes-styrene) triblock copolymer
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Dielectric properties of a hydrated sulfonated poly(styrene-ethylene/butylenes-styrene) triblock copolymer

机译：水合磺化聚（苯乙烯-乙烯/丁烯-苯乙烯）三嵌段共聚物的介电性能

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The present study showed that sulfonated poly(styrene-ethylene/butylenes-styrene) (S-SEBS) triblock copolymer ionomers can be made to exhibit dielectric constants on the order of a hundreds thousand. Although they are too lossy at this point to use as dielectric materials in capacitors or as electrostrictive Maxwell effect transducer materials because of their high hydrogen ion conductivity, the results of these initial dielectric studies as a function of ion content were used to try to understand the effects of a polar plasticizer, water, on dielectric properties of the acid form of this ionomer. This was done before moving on to more tightly bound ions (rather than the hydrogen ions of the sulfonic acid groups used here) and to other polar, less mobile plasticizers (which also interact strongly with the ionic dipoles). The discovery of such high dielectric constants suggested the possibility that low dielectric loss versions of this type of polymer, as well as other members of the class known as ionomers, might find future applications as extremely high dielectric constant materials in capacitors or transducers. Experimental results for films with degrees of sulfonation on the order of 10% or more showed dielectric constants on the order of epsilon'similar to 100,000 but dielectric loss tangents near D = tan delta similar to 0.3, when the materials were exposed to high humidity conditions. Experiments to determine the effects of water content on the material's dielectric response showed that water can easily move into and out of the films studied and that this transport behavior is strongly correlated to the relative humidity of the environment and to the degree of sulfonation. Water content, in this case, was thus the primary consideration when attempting to understand the observed high dielectric constants in films with degree of sulfonation greater than 5.5%. However, vacuum-dried films were, also, examined and observed to exhibit a dielectric constant on the order of 2 until the degree of sulfonation was greater than 11%. Above this value, the dielectric constant increased by approximately 100% to a value on the order of 4. (c) 2005 Elsevier B.V All rights reserved.
机译：本研究表明，可以使磺化聚（苯乙烯-乙烯/丁烯-苯乙烯）（S-SEBS）三嵌段共聚物离聚物表现出约十万的介电常数。尽管由于它们的高氢离子电导率，它们此时损耗太大，不能用作电容器中的电介质材料或用作电致伸缩麦克斯韦效应换能器材料，但这些初始电介质研究的结果随离子含量的变化被用来试图理解电导率。极性增塑剂水对这种离聚物酸形式介电性能的影响。这是在转移到更紧密结合的离子（而不是此处使用的磺酸基团的氢离子）和其他极性较小，流动性较小的增塑剂（它们也与离子偶极子强烈相互作用）之前完成的。如此高的介电常数的发现表明，这种聚合物的低介电损耗版本以及称为离子交联聚合物的此类其他成员可能会在电容器或换能器中找到极高介电常数材料的未来应用。磺化度在10％或更高数量级的薄膜的实验结果表明，当材料暴露于高湿度条件下时，介电常数在ε左右，约为100,000，但D = tanδ附近的介电损耗正切值近似于0.3。 。确定水含量对材料介电响应的影响的实验表明，水可以轻松地进入和移出所研究的薄膜，并且这种传输行为与环境的相对湿度和磺化程度密切相关。因此，在这种情况下，水含量是试图理解磺化度大于5.5％的薄膜中观察到的高介电常数时的主要考虑因素。然而，还检查并观察到真空干燥的膜表现出约2的介电常数，直到磺化度大于11％。高于该值，介电常数增加约100％，达到大约4的值。（c）2005 Elsevier B.V保留所有权利。

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