doi:

DOI: 10.3724/SP.J.1105.2014.13189

Acta Polymerica Sinica (高分子学报) 2014/014:2 PP.202-209

Synthesis of a Silane Coupling Agent and Its Application in Silica/NR Composites


Abstract:
A silane coupling agent was obtained by reaction of (3-glycidyloxy-propyl)trimethoxysilane (A187) and N-phenyl-1,4-phenylenedi-amine (PPDA). Its structure was characterized by 1H-NMR, IR and MS. After that, different amounts of the silane coupling agent were used to in situ modify the silica to prepare antioxidant functionalized silica/NR composites. The processing ability, mechanical properties and antioxidation effect of the composites were compared with those of the carbon black/NR, neat silica/NR and bis(3-triethoxysilylpropyl) tetrasulfane (Si69) modified silica/NR composites. Cure characteristics and RPA results showed that the viscosity, the highest torque, optimum cure time and dispersion of filler of the antioxidant functionalized silica/NR were improved. The mechanical properties of the composites increased with increasing amount of silane coupling agent first, and then reached a plateau. When the amount of silane coupling agent was more than or equal to 10.8% (wt% to silica), the tensile strength of the composites was as high as that of carbon black/NR and Si69 modified silica/NR, which was much higher than that of neat silica/NR. Moreover, the tear strength of the composites was higher than that of all references. After air ageing at 100 ℃ for different days, the mechanical property retention of the antioxidant functionalized silica/NR was better than that of all references with antioxidant 4020, which illustrates that the new silane coupling agent has better ageing resistance than antioxidant 4020.

Key words:Antioxidation, Silane coupling agent, Surface modification of silica, Silica/NR composites

ReleaseDate:2014-07-21 17:05:29



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