Liquid Nitrile Rubber Modified NBR/CuSO4 Composites with Excellent Mechanical Properties and Cyclic Processing Ability
Incorporation of CuSO4 effectively enhanced the strength of rubber,but simultaneously accompanied by sacrifices of fracture elongation and recyclability,which is a challenge for their further applications.In our previous study,the preparation and analysis of nitrile butadiene rubber(NBR)composites filled with CuSO4 have been done.Here,low molecular weight liquid nitrile butadiene rubber(LNBR)was used to toughen NBR/CuSO4 and to prepare NBR/CuSO4/LNBR composites with high mechanical properties and excellent recyclability.XRD,vulcanization curves,and DSC results indicate that LNBR has an inhibitory effect on the coordination reaction between CuSO4 and NBR.SEM results show that LNBR reduces the crosslinking density of NBR/CuSO4.The tensile strength up to 34.2 MPa and breaking energy of 71.58 MJ/m3 at a fracture elongation of 583.0%are obtained when the content of LNBR is 4 phr.Moreover,the addition of LNBR promotes the fracture and recombination process of Cu-CN coordination bonds,resulting in the increasing of the recovery capacity of NBR/CuSO4/LNBR composites.Specially,the recovery capacity of one composite after secondary processing is kept at 93.6%.
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