Research on block copolymer toughened hydrophobic CEP insulation materials

2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2015-12-17 DOI:10.1109/CEIDP.2015.7352044

Zhiqiang Tao, Jiansheng Chen, H. Le

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Abstract

Commercial hydrophobic cycloaliphatic epoxies (Hydrophobic CEP) with good weatherability have been used as outdoor insulator materials in recent years while their properties of crack resistance and toughness are concerning topics because of their brittle alicyclic structure. Block copolymer (BCP) can self-assemble into the spherical structure in the liquid epoxy system due to its amphiphilic feature and the nano-scale BCP sphere homogeneously embedded in epoxy can act as toughener and show the good toughening effect. The performances of filled and unfilled hydrophobic CEP system toughened by low loading level BCP tougheners, including thermal property, mechanical properties, fracture toughness and low temperature cracking was investigated. BCP toughened epoxy showed improved elongation at break, increasing of fracture toughness, similar thermal stability and a little decreased modulus compared to normal hydrophobic CEP systems. With the improved performance and comparable processability, BCP toughened epoxy system could be used for electrical industry, especially for outdoor application.

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嵌段共聚物增韧疏水CEP绝缘材料的研究

疏水环脂肪族环氧树脂(hydrophobic cycloaliphatic epoxy环氧树脂，简称CEP)具有良好的耐候性，近年来作为室外绝缘子材料得到广泛应用，但由于其脂环结构脆性，其抗裂性能和韧性一直是人们关注的话题。嵌段共聚物(BCP)由于其两亲性，在液态环氧体系中可以自组装成球形结构，纳米级的BCP球形均匀嵌入环氧树脂中，可以起到增韧剂的作用，表现出良好的增韧效果。研究了低负荷BCP增韧剂增韧填充型和未填充型疏水CEP体系的热性能、力学性能、断裂韧性和低温开裂性能。与普通疏水CEP体系相比，BCP增韧环氧树脂的断裂伸长率有所提高，断裂韧性有所提高，热稳定性相似，模量略有下降。BCP增韧环氧树脂体系具有良好的性能和可加工性，可用于电气工业，特别是户外应用。

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2015 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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