Mechanical properties of silane‐treated, silica‐particle‐filled polyisoprene rubber composites: Effects of the loading amount and alkoxy group numbers of a silane coupling agent containing mercapto groups

Abstract

ABSTRACT:The surface treatment of spherical silica particles with a silane coupling agent with mercapto groups was carried out. The treated silica particles were incorporated within polyisoprene and then vulcanized. The effects of the loading amount and alkoxy group number of silane on the stress-strain curve of the filled composite were investigated. For this purpose, silanes with dialkoxy and trialkoxy structures were used. The loading amount of silane on the silica surface was varied from 1 to 8 times the amount required for monolayer coverage. The stress at the same strain increased with the silane treatment, and it was higher in the dialkoxy structure than in the trialkoxy structure above 300% strain. There was no significant influence of the loading amount on the stress for the trialkoxy silane structure. However, the stress was influenced by the loading amount, and the maximum stress was observed at 4 times the silane amount required for monolayer coverage for the dialkoxy structure. The stress had a good relationship with the crosslinking density of silica-filled polyisoprene rubber (measured with a swelling test). The reinforcement effect by the silane treatment of silica was found to be affected strongly both by the entanglement of the silane chain and polyisoprene rubber matrix and by the crosslinking reaction between the mercapto group of silane and polyisoprene rubber in the interfacial

Compatibilization of natural rubber/nitrile rubber blends by sol–gel nano-silica generated by in situ method

“…There are many reports on in situ silicafilled elastomer composites where mostly single rubber system such as natural rubber (NR) [1][2][3][4][5][6][7], styrene butadiene rubber (SBR) [8][9][10][11], butadiene rubber (BR) [12], chloroprene rubber (CR) [13,14] and nitrile rubber (NBR) [15][16][17][18][19][20][21] is focused. Studies on the rubber blends, filled with in situ silica, are rather scanty in literature.…”

Influences of the alkoxy group number and treatment condition on the structure of glycidoxy functional silane-treated layer on silica particles analyzed by1H pulse NMR

“…The network density of the silane-treated layer on the silica particles could be controlled by varying the mixing ratio of di-alkoxy/tri-alkoxy structures. Treated silica particles were mixed with a polyisoprene rubber (PIR) matrix and vulcanized, and the effects of di-alkoxy/tri-alkoxy mixing ratio on the stress-strain characteristics of the filled PIR were investigated [5,8]. The stress at the same strain increased due to silane treatment, and was higher for the di-alkoxy structure and lightly crosslinked network structure than other structures above 300% strain.…”

“…We have investigated the effect of interfacial adhesion between inorganic fillers surface-treated with various silane coupling agents and a matrix polymer on the mechanical properties of these composites [1][2][3][4][5][6][7][8]. Surface treatment of spherical silica particles using a silane coupling agent with a mercapto group was previously [7] conducted and the structure of the silanelayer formed on the silica surface was analyzed by 1 H pulse nuclear magnetic resonance (NMR).…”

Effect of Silane Treatment Methods on Physical Properties of Rice Husk Flour/Natural Rubber Composites

“…is result was well supported by the cross-link density result as shown in Figure 6. e increment of cross-link density of the Advances in Materials Science and Engineeringcross-linking reaction between the silane molecules and NR matrix and resulted in the lower cross-link density of the UW-ST/NR composite [14]. Figure 6 represents the cross-link density of gum NR, 2ALT/NR, UW-ST/NR, and W-ST/NR composites.…”

“…Fukuda et al [12,13] and Nakamura et al [14] studied the effect of silane structure layer on mechanical properties of styrene butadiene rubber composites containing silanetreated inorganic filler. ey reported that the chemisorbed silane deposited on the filler surface improved tensile strength and tensile modulus of the composites, whereas the physisorbed silane structure increased their elongation at break.…”