超临界二氧化碳发泡三元乙丙橡胶/低密度聚乙烯热塑性弹性体

EPDM/LDPE Thermoplastic Elastomer Foamed by Supercritical Carbon Dioxide

研究硫化体系和橡塑比对超临界二氧化碳发泡三元乙丙橡胶(EPDM)/低密度聚乙烯(LDPE)热塑性弹性体物理性能和微观结构的影响。结果表明:采用过氧化物硫化体系的热塑性弹性体的综合物理性能优于采用硫黄硫化体系,随着硫化剂用量的增大,拉伸强度和撕裂强度有一个最大值,硬度上升;橡塑比为40/60时,物理性能达到最佳;LDPE相与EPDM相呈现"海-岛"两相微观结构;泡孔大小均匀性较好。

The effect of curing system and blending ratio of rubber and plastic on the mechanical properties and micro-structure of EPDM/LDPE thermoplastic elastomer（TPE）foamed by supercritical carbon dioxide was studied.The results showed that,the mechanical properties of TPE cured with peroxide curing system were better than those cured with sulfur curing system.With the increase of the addition level of curing agent,the tensile strength and tear strength had a maximum value,and Shore A hardness increased.When the blending ratio of EPDM/LDPE was 40/60,the mechanical property was at the best.It was found that the morphology of the blend was a sea-island structure in which LDPE was the continuous phase and EPDM formed the dispersed phase.In addition,the pore size distribution was uniform.