Mechanical properties of MS type polypropylene thermoplastic elastomer
In order to prepare polypropylene thermoplastic elastomer(PTPE)with uniform and fine phase domain size,easy control of morphology and structure,and stable mechanical properties,PTPE was synthesized in a homogeneous system of polypropylene(PP)and rubber using dynamic vulcanization and microphase separation techniques.The microphase separation is caused by the energy effect during the vulcanization process,and the morphology and size of the phase domain during the reaction are controlled by the energy effect and entropy effect.The effects of rubber/plastic ratio,rubber ratio,and relative molecular weight of PP,amount of initiator,amount of bridging agent,and reaction temperature on the chemical structure and mechanical properties of the sample were investigated.The results showed that at the reaction temperature of 125℃,when the sample formula was E/PP=70/30,the ratio of ethylene propylene rubber and butadiene styrene rubber is 80∶20,initiator dosage was 2.14 parts,and bridging agent dosage was 18.2 parts,the comprehensive mechanical properties of the sample were the best.The tensile strength,100%elongation at break,elongation at break,tear strength,and permanent deformation at break were 11.25 MPa,8.78 MPa,384%,58.5 kN/m and 78%,respectively.
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万方数据
维普
