| Silicone rubber has high temperature resistance,cold resistance,ozone resistance and low glass translation temperature(Tg).At the same time,it is not dependent on petroleum sources and its output has greatly been increased.If silicone rubber could blend with traditional tread rubber and the silicone rubber/traditional tread rubber composites could demonstrate the excellent performance of two rubbers,it would greatly expand the application of silicone rubber.Therefore,in this thesis,we focus on the effects of mass ratio of silicone rubber and emulsion styrene butadiene rubber,inter facial compatibilizer and coupling agent modified filling system on properties of silicone rubber/emulsion styrene butadiene rubber composites.It is expected that this work can contribute for the potential applications of silicone rubber in tires.1.In the present work,the effects of different blending ratios of methyl vinyl silicone rubber(VMQ)/emulsion styrene butadiene rubber(ESBR)on properties of VMQ/ESBR blends were studied.The results showed that the VMQ lowered the Mooney viscosity,improved the processing performance,reduced the optimum cure time t90 and the crosslink density of the compounds by participating in vulcanization.Meanwhile,the tensile strength,tear strength,hardness,the modulus,tan? at 0 ? and 60 ? of the vulcanizates are all decreased.Glass transition temperature(Tg)were reduced,which improved the cold resistance.When the mass ratios of VMQ/ESBR was 20/80,its mechanical properties physical,the scorch time and the optimum cure time met the requirements,which can be further studied.2.In this work,we studied the effect of interfacial compatibilizer coupling(TMPMP)on the properties of silica-filled VMQ/ESBR composites.The results showed that TMPMP increased the Mooney viscosity,lowered the Payne effect of vulcanizates and improved the curing rate and the crosslinking density by participating in vulcanization.Besides,the tensile strength,tear strength and the modulus of the vulcanizates were improved.It was not obvious for the improvement of wet skid resistance,wear resistance and rolling resistance.It increased the dynamic compression temperature rise of vulcanized rubber.3.In this experiment,we studied the effects of silane coupling agents on properties of silica-filled VMQ/ESBR composites.The results showed that the affinity between silica and VMQ was stronger than that of ESBR.The coupling agents increased the bound rubber contents and improved the dispersion of fillers.The relative content of VMQ in rubber-filler gels of A151 compounds was the highest,the mechanical properties were moderate and compression temperature rise was generally relatively low.The relative contents of ESBR in rubber-filler gels of Si747 and Si69 compounds were higher,the bound rubber contents were increased and the dispersion of fillers were improved.Si69 reduced the crosslinking density,lowered the modulus of composites and increased the compression temperature rise.The mechanical properties and wear resistance of Si747 composites were more excellent.4.In this work,the effects of additive contents of A151 or Si747 on properties of silica-filled VMQ/ESBR composites were investigated.The results exhibited that with the increase of the amount of A151,VMQ contents in gels was increased and the Payne effect was weakened,but the filler-rubber interaction was not increased obviouly.Si747 can make the contents of VMQ in gels decreased and the content ESBR in gels increased,which could lead to higher bound rubber contents and enhanced filler-ESBR interaction.Its processing performance,tensile strength,tear strength,wet grip resistance and abrasion resistance were all improved.Compared with the vulcanizated ESBR,wet grip resistance and abrasion resistance of Si747/Si02/VMQ/ESBR composites were more excellent and compression temperature rise was lower. |
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