Mica-EVA-AR弹性体复合材料动态力学性能

将乙烯醋酸乙烯酯共聚物(EVA)、 丙烯酸酯弹性体(AR)和云母(Mica)熔融共混制备了一系列复合材料。动态力学分析发现, EVA与AR共混后, tanδ在5℃附近出现了新峰; 在EVA-AR(80/20)中加入聚合级空间受阻酚MPDI(4-甲基-苯酚与二环戊二烯和异丁烯的反应产物), tanδ峰值逐渐增大, 且峰位置逐渐向高温方向偏移。云母的加入使EVA-AR-MPDI共混物的tanδ峰位置明显向高温方向偏移, 而且峰宽拓宽明显。随着云母含量的增加, 高温区tanδ数值逐步变大, 损耗模量E″大幅度提高, 当云母含量为58.8wt%时E″峰值由未加云母时的79MPa增加至280MPa, 并且E″峰位置向高温偏移。氢键红外光谱和扫描电镜分析结果表明, 复合材料阻尼性能有所提高。 

Dynamic mechanical properties of Mica-EVA-AR composites

A serises of composites consisting of Ethylene-Vinyl Acetate copolymer (EVA), Acrylic Rubber(AR) and mica were prepared by melting blend. The results from dynamic mechanical analysis show that a new tanδ peak is observed at 5℃ when EVA is blended with AR. The addition of MPDI(4-methyl-pheno reaction products with dicyclopentadiene and isobutylene) in EVAAR (80/20) blend results in the shift of the tanδ peak to higher temperature and the enhancement of the value of tanδ. When mica is added in EVAARMPDI blends, both tanδ peak and the loss modulus E″ shift to a higher temperature region. With increasing mica content, tanδ peak intensity in high temperature range increases, and loss modulus E″ is enhanced greatly. The value of E″ peak changes from 79MPa to 280MPa with the content of mica from 0wt% to 58.8wt%. The analysis results of FTIR and SEM prove the increase of the dynamic mechanical properties of mica-EVA-AR-MPDI composites.