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摘要
In this paper, rubber powder was mechano-chemically modified via modifier 2, 2'-dibenzothiazoledisulfde and high-shearing using twin-screw extruder at 100 degrees C. The mechanism of modification of the rubber powder and the influence of modification on the structure and properties of the rubber powder/natural rubber (NR) compounds were tested and characterized. The content of oxygen-containing groups on the surface of the mechano-chemically modified rubber powder (MCRP) was higher than that for unmodified rubber powder (URP). Also, the swelling degree of MCRP was 1.5 times that of URP. The initial degradation temperature and the maximum weight loss rate of MCRP were decreased after modification. These results indicate that the surface activity of the modified RP was improved while the crosslinking degree was decreased under the dual action of high shearing and chemical modification effect. The Rubber processing analyzer test results show that the processability of MCRP/NR gross rubber was improved, as well as the hysteresis loss was reduced after vulcanization. The Differential scanning calorimetry test found that the MCRP surface had the highest weight fraction of restricted molecular layers (chi(im)), the interaction between the MCRP and NR matrix was enhanced. Scanning electron microscope test revealed that in the case of URP, both the surface roughness and its dispersion on NR matrix were increased after mechano-chemically modification. Hence, the tensile strength of MCRP/NR was increased by 31% as compared to that of URP/NR.
