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Effects of surface chemistry of silica particles on secondary structure and tensile properties of silica‐filled rubber systems
Author(s) -
Suzuki Nozomu,
Yatsuyanagi Fumito,
Ito Masayoshi,
Kaidou Hiroyuki
Publication year - 2002
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.11050
Subject(s) - silanol , natural rubber , hydrophobic silica , fumed silica , ultimate tensile strength , materials science , agglomerate , precipitated silica , adsorption , composite material , vulcanization , alkyl , chemical engineering , silane , polymer chemistry , chemistry , organic chemistry , catalysis , engineering
Silica particles were treated by silane coupling agents to study the effects of surface chemistry of silica particles on the secondary structure formed by silica particles in styrene–butadiene rubber (SBR). The relation between the size of secondary structure and tensile properties of silica‐filled SBR vulcanizates was also investigated. The water molecules adsorbed on the silica surface enhanced both the reactivity of the coupling agents with silanol groups on the silica surface and the condensation reaction between coupling agents. The averaged size of one agglomerate in the filled vulcanizate ( S agg ) decreased with the increase of the hydrophobic character of silica particles, which were obtained by the introduction of coupling agents with alkyl groups. The initial slope of stress–strain curves for silica‐filled vulcanizates decreased with the decrease of S agg . Further, a clear Payne effect was observed in all silica‐filled vulcanizates, with this tendency more prominent in the larger S agg . © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 1622–1629, 2002