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Effect of silane treatment on physical properties of rice husk powder / natural rubber composites

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Document pages: 14 pages

Abstract: In this study, the effects of silane treatment on the curing characteristics, mechanical, dynamic mechanical and morphological properties of rice husk powder (RHF) natural rubber (NR) composites were studied. The RHF surface was pretreated with alkali solution, and then the RHF surface was treated with bis (triethoxysilpropyl) tetrasulfide (tespt) solution using unwashed silane treatment method and washed silane treatment method. The expected difference between the two methods is the silane layer present on the RHF surface. RHF NR composites were prepared by adding unwashed tespt treated RHF (uw-st) and washed tespt treated RHF (w-st) into Nr. The tespt molecules deposited on the surfaces of uw-st and w-st were confirmed by the additional peaks in the FTIR spectra of uw-st and w-st.In addition, the decrement of decomposition temperatures and the changes in the residue amounts of UW-ST and W-ST proved the removal of the physisorbed silane layers after washing. The presence of TESPT molecules on the RHF surface enhanced compatibility and adhesion between RHF and NR matrix. This was confirmed by SEM micrographs of both UW-ST NR and W-ST NR composites. This result was also supported by the improvement of the mechanical and the dynamic mechanical properties of these two composites. According to mechanical properties of the NR composites, the washing silane treatment method was more effective than the unwashing silane treatment method for compatibility improvement between RHF and NR. The modulus, tensile strength, and tear strength of W-ST NR composites can be enhanced without deterioration of their elongation at break.

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