Study On Preparation And Characterization Of The Styrene Butadiene Rubber Filled With Core-sell Interpenetrating Fillers

The emulsion polymerization of preparing polystyrene fillers with various sizes was studied in the context. The size distribution and morphology of the fillers were discussed. The filled styrenebutadiene rubber composites were prepared by emulsion flocculation method. The fracture morphology, static and dynamic properties of the filled composites was characterized. The reinforcing mechanism of the polymeric fillers filled styrene butadiene rubber composite was also investigated. The experiment was conducted as follows,1. The crosslinked polystyrene Nanofillers and Microfillers were synthesized by emulsion polymerization and soap free emulsion polymerization. The average size and morphology of the fillers were analyzed by scanning electron microscope and particle size analyzer. The results showed that the Nanofillers and Microfillers were spherical in shape with the diameter of 25±5 nm and 150±20 nm. The particles exhibited with good monodisperse in general.2. The polystyrene fillers filled styrene butadiene rubber Nanocomposites, Microcomposites as well as mixed composites were prepared by emulsion blending. The SEM fracture images showed that Nanofillers and Microfillers were well dispersed in the SBR matrix, flocculation parts were barely observed among the Nanofillers. The impact factors such as filler size and volume fraction on static mechanical properties of the composites were discussed. It was shown that the composites filled with 30 phr PS Nanofillers had a maximum tensile strength of 13.2 MPa, tensile strain of 580 %. The distances between fillers were about 10 nm in average. The dynamic mechanical tests showed that the Nanocomposites had a maximum storage modulus of 5×107 Pa at normal temperature, and with a minimum loss angle of 0.6. The influence factors such as filler size, filler content and temperature on Payne effects were studied. The critical strain of the Nanocomposites gradually decreased from 10.8 % to 2.6 % with the increasing content from 5 phr to 30 phr. The composites filled with 30 phr Nanofillers had the highest initial storage modulus of about 2.5×107 Pa. The modulus of the Microcomposites was relatively lower, and the storage modulus platform stayed rather constant at wide strain regions. The influence of filler content on the critical strain of the Microcompsoites was not obvious. The initial storage modulus of the Nanocomposites decreased from 2.5×107 Pa to 1.2×107 Pa at the temperature ranging from 20 oC to 100 oC. The AFM test showed that the minish of bound rubber structure was the main cause to the storage modulus decrease.3. The polystyrene-poly glycidyl methacrylate(PS-PGMA) Nanofillers were synthesized through batch emulsion polymerization. The size and structure as well as morphology of the fillers were investigated. The particle size increased from 25 nm to 32 nm with the increasing amounts of PGMA component. The PS-PGMA fillers filled composites were prepared by emulsion blending. The fracture morphology tested showed that aggregation degree and size were enlarged with increasing PGMA contents. The strain strength and elongation of the composites increased at first and then decreased. The dynamic strain tested showed that Payne effects were strengthened and initial storage modulus gradually decreased with increasing PGMA component. The experiment detected the filler polar properties have an impact on morphology and mechanical properties of the composites. It was forecasted that PGMA polar component was suitable to modify the polar polymer matrix.