Studies On The Preparation And Propertise Of SEBS Thermoplastic Elastomer

Styrene-Ethylene/Butylene-Styrene Block Co-polymer is a novel thermoplastic elastomer,abbreviated as SEBS.SEBS does not need to be vulcanized to have elasticity which is like the rubbers.Its leftover material can be reused.What's more,SEBS is non-toxicity.It also has low density and excellent insulation properties.It is widely used in plastic modifiers,seals,electric wire and cable,medical supplies,leisure and entertainment products and other fields.In this paper,SEBS is blended with PS and PP as matrix materials for modification respectively.The effects of paraffin oil content,calcium carbonate content,blending processing methods,and wear resistance additives on the performance of SEBS/PS and SEBS/PP elastomers were studied.In addition,the performance of SEBS/PS and SEBS/PP elastomers was also studied by adding graphene and Carbon Nanotubeand blending processing methods.The main work is as follows:1)The effects of PS content,paraffin oil content,blending method,and calcium carbonate content on the properties of SEBS/PS elastomers were investigated.Studies have shown that as the content of PS increases,hardness,tensile strength,and compression set increase.When the content of paraffin oil increases,the hardness and tensile strength decrease,the compression set first decreases and then increases,and the thermal stability of the material decreases at 50-370?.With the increase of CaCO₃content,under the characterization of SEM images,the CaCO₃ agglomeration phenomenon increases,the hardness increases,and the tensile strength and the compression set decreased.When the content of PS is 30 phr,the amount of paraffin oil is 80 phr,and the content of CaCO₃ is 30 phr,the elastomer can have better performance.2)The effects of the content of PP,the content of three paraffin oils,the oil-filling time and the oil-filling temperature on the properties of SEBS/PP elastomers were investigated.Studies have shown that as the content of PP increases,tensile strength and compression set increase,and the crystallinity of the elastomer increases.When the oil-filled volume increases,the tensile strength of the elastomer decreases,and the compression set first decreases and then increases.The oil filling time of 24 hours can achieve better oil-filling effect and ensure work efficiency.As the oil-filled temperature increases,the mechanical properties of the elastomer decrease.When the content of PP is 30phr,the content of paraffin oil is 80phr,the oil-filling time is 24hours and the oil-filling temperature is 15?,the SEBS/PP elastomer has the best performance.3)The effect of the wear-resistant additives on the mechanical properties,compression set,thermal properties,fluidity and surface friction of the elastomers was studied.Studies have shown that the content of hand-feeling wear-resistant additives can effectively improve the surface of the material sticky phenomenon.With the increase in the content of hand-feeling wear-resistant additives,the tensile strength slightly decreased,the compression set slightly increased,and the friction coefficient decreased first and then increased,with little effect on the rheological properties.When the addition content of hand-feeling wear-resistant additives is 8phr,the overall performance of the material is the best.4)The effects of graphene and carbon nanotubes on the mechanical properties,thermal properties,thermal conductivity and electrical conductivity of the elastomers were studied.The content of graphene and carbon nanotubes increases the hardness of the SEBS/PP elastomer,increases the tensile strength,then decreases,the surface resistance decreases,and the thermal conductivity increases.The content of coupling agent effectively improves the electrical and thermal properties of the elastomer.