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以三烯丙基异氰脲酸酯(TAIC)为交联敏化剂,采用电子束对高密度聚乙烯(HDPE)与乙烯-乙酸乙烯酯共聚物(EVA)的共混物进行辐射交联。研究了TAIC的敏化作用机理以及辐照剂量对共混物的力学性能、电学性能以及结晶度与交联度之间的相互关系。结果表明:TAIC对共混体系的交联反应具有敏化作用,可显著减小辐射剂量,共混物产生交联反应后可获得较高的凝胶含量;在辐射剂量120 kGy时,1%的TAIC即可使复合材料的拉伸强度提高了20%,断裂伸长率达到475.4%。此外,电子束辐射并未改变复合材料的晶型,随着辐射剂量的增加,复合材料的结晶温度、熔点、介电常数下降,共混物的介电损耗在120 kGy剂量下达到最佳。
The crosslinking of high density polyethylene (HDPE) with ethylene-vinyl acetate copolymer (EVA) was carried out by electron beam with triallyl isocyanurate (TAIC) as cross-linking sensitizer . The sensitization mechanism of TAIC and the relationship between radiation dose and the mechanical properties, electrical properties, crystallinity and crosslinking degree of the blends were studied. The results showed that: TAIC sensitized the cross-linking reaction of the blend system, which could significantly reduce the radiation dose, and the higher gel content could be obtained after the cross-linking reaction of the blend. At the irradiation dose of 120 kGy, 1% The TAIC can make the composite tensile strength increased by 20%, elongation at break of 475.4%. In addition, the electron beam irradiation did not change the crystal form of the composites. With the increase of radiation dose, the crystallization temperature, melting point and dielectric constant of the composites decreased, and the dielectric loss of the composites reached the best at 120 kGy dose.