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Estimation of silica flocculation in SBR/BR compounds reinforced with different silica contents from their rheocurves
Author(s) -
Yang JaeKyoung,
Park Wonhyeong,
Ryu Changseok,
Kim Sun Jung,
Kim Do Il,
Seo Gon,
Kim JongHo,
Chung ChangBok
Publication year - 2020
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.48559
Subject(s) - flocculation , natural rubber , precipitated silica , materials science , silanes , mooney viscosity , chemical engineering , mixing (physics) , silane , composite material , chemistry , polymer chemistry , organic chemistry , polymer , copolymer , engineering , physics , quantum mechanics
The rheocurves of silica‐filled styrene–butadiene/polybutadiene rubber (SBR/BR) compounds containing 3‐octadecyltriethoxy silane (OTES) and bis‐[triethoxysilylpropyl]tetrasulfide (TESPT) were investigated to examine the effects of silica content and silanes on silica flocculation during mixing and cure. SBR/BR compounds without curatives were also prepared to infer the effect of cure on silica flocculation. The maximum torque of the compounds could be deconvoluted to individual source torques such as silica flocculation during mixing and cure, crosslinking of rubber, and coupling between rubber and silica by assuming the independence of silica flocculation from cure and coupling. Torque due to silica flocculation increased with the silica content of the SBR/BR compounds, but its effect was significantly reduced by the addition of OTES or TESPT. TESPT suppressed silica flocculation and facilitated coupling, thus yielding enhanced tensile properties. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48559.