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Damping of blends of EVM/EPDM and EVM/NBR

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  • Abstract:The damping properties of ethylene vinyl-acetate copolymer (EVM)/ethylene-propylene-diene monomer (EPDM) and EVM/nitrile butadiene rubber (NBR) blends, with di(tert-butylperoxyisopropyl)benzene (BIBP) as the curing agent, were investigated by dynamic mechanic analyzer (DMA). The effects of PVC, N-cyclohexyl-2-benzothiazole (CZ), and dicumyl peroxide (DCP) on the damping properties were studies. The results show that in EVM/EPDM/PVC blends, PVC and EVM700 are compatible with one tanδ peak, which improves the damping properties of EVM at higher temperature. In EVM/NBR blends, PVC and EVM/NBR blends are partially compatible with two combined tanδ peaks, which widens the effective damping temperature range to 62.4°C. 1.4 phr DCP enlargs the tanδ peak of EVM/NBR with the effective damping temperature range up to 64.9°C. Small amount of CZ can enlarge the tanδ peak of EVM/NBR. 5 phr Zn(AA)2 can also widen the tanδ peak of EVM/NBR.

  • Volume:27

  • Issue:5

  • Translation or Not:no

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