Effects of vulcanization accelerator functionalized graphene on the co-vulcanization kinetics and mechanical strength of NR/SBR blends |
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Institution: | 1. IFIMAT y CIFICEN (CONICET-UNCPBA), Pinto 399, B7000GHG Tandil, Argentina;2. Laboratorio de Polímeros y Materiales Compuestos, Departamento de Física, Universidad de Buenos Aires, Ciudad Universitaria, C1428EHA Buenos Aires, Argentina;3. Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Argentina;4. Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA), Argentina |
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Abstract: | Rubber blends are widely used for combining the advantages of individual rubber component. However, to date, how to determine and distinguish the vulcanization kinetics for each single rubber phase in rubber blends during the co-vulcanization process are still a challenge. Herein, high resolution pyrolysis gas chromatography-mass spectrometry (PyGC-MS) was employed for the first time to investigate the vulcanization kinetics of natural rubber (NR) and styrene-butadiene rubber (SBR) in their blends filled with graphene. It is shown that the crosslinking rate of NR chains (kNR) was much lower than that of SBR chains (kSBR) in the unfilled blends and blends with untreated graphene. Interestingly, the gap between kSBR and kNR was narrowed effectively in the blends with vulcanization accelerator grafted graphene, showing a better co-vulcanization of NR and SBR. In addition, the vulcanization accelerator grafted graphene was uniformly dispersed in rubber matrix and endowed rubber blends with higher mechanical strength and thermal conductivity did the untreated graphene. |
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Keywords: | Rubber blends Graphene Vulcanization kinetics |
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