Dynamic mechanical properties of MicaEVAAR 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.