The phenolic resin(PR) and tetrakis(methylene-3-(3-5-ditert2butyl242hydroxy phenyl) propionyloxy) methane(AO60) were added into the acrylonitrile-butadiene rubber(NBR) to prepare the vulcanized NBR/PR/ hindered phenol rubbers.The structures of the vulcanized rubbers were characterized by DSC,FTIR,DMTA and SEM.And their damping and mechanical mechanism were investigated in detail.The results show that the microscopic structures of vulcanized rubber include the networks of intermolecular hydrogen bonds between NBR and AO60 molecules,the nonbonding complexation of PR in NBR,the molecular aggregation of AO60(AO60 rich phase) and NBR segments incorporate into the AO60 molecular aggregations besides the vulcanized networks of NBR.These complex molecular interactions lead to the increase of internal friction,and thus vulcanized rubber obtain good damping properties.However,with the increasing of the deposited time,the two-peak tanδ-temperature curve changes to three-peak tanδ-temperature curve,the AO60 molecules aggregate and crystalline in the inner structures of rubbers,and gather together to form bigger AO60 congeries,which affects the stability of damping properties of the vulcanized rubber.
Key words
hindered phenol /
acrylonitrile-butadiene /
phenolic resin /
damping /
deposited time
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