几种新型共混高分子材料的形态和介电强度

Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM) Pub Date : 1994-07-03 DOI:10.1109/ICPADM.1994.413965

H. Kato, S. Simoura, M. Kawahigashi

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引用次数: 3

摘要

研究了几种新型弹性聚合物共混提高低密度聚乙烯(LDPE)介电强度的方法。二嵌段和三嵌段苯乙烯-异戊二烯共聚物对提高LDPE的冲击击穿强度最有效。单个共聚物的最佳共混比为苯乙烯含量为20 wt%的双嵌段共聚物，当共混比为35 ~ 40 wt%时，对LDPE的Imp. BDS的改善最为显著。在该共聚物中，苯乙烯嵌段为硬段，异戊二烯单元为软段。这种结构可以被认为对弹性体/LDPE共混物的最终形态有直接影响。对几种具有良好Imp. BDS的共混聚合物的透射电镜观察表明，这些样品的分散性和形态性质与加工温度密切相关。讨论了混炼LDPE在Imp. BDS中的改进与其形态性质的一定关系。

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Morphology and dielectric strength of some new blended polymeric materials

Enhancement of the dielectrical strength of low density polyethylene(LDPE) by means of blending of some new elastic polymers was studied. The di- and tri-block styrene-isoprene copolymers were found to be most effective for improving the impulse breakdown strength of LDPE. The most optimum blending ratio for individual copolymers, for example, di-block copolymer with styrene content of 20 wt% gave the most significant improvement of Imp. BDS of LDPE with 35 to 40 wt% blending ratio. In this copolymer, styrene block offers a hard segment, and the isoprene unit behaves as a soft segment. This structure can be considered to give direct influence on the final morphology of the elastomer/LDPE blends. TEM observation on several blended polymers which gave excellent Imp. BDS revealed that the dispersion and morphological nature of these samples were closely related to the processing temperature. Certain relation of improvement in Imp. BDS of blended LDPE and its morphological nature are discussed.<>

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Proceedings of 1994 4th International Conference on Properties and Applications of Dielectric Materials (ICPADM)

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