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Silica‐filled NR compounds prepared by dry and wet masterbatches with different mixing times
Author(s) -
Ryu Changseok,
Yang JaeKyoung,
Park Wonhyeong,
Kim Sun Jung,
Kim Do Il,
Seo Gon
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.49548
Subject(s) - mixing (physics) , materials science , masterbatch , natural rubber , precipitated silica , composite material , ultimate tensile strength , dispersion (optics) , dispersant , stabilizer (aeronautics) , mooney viscosity , viscosity , chemical engineering , copolymer , polymer , nanocomposite , optics , mechanical engineering , physics , quantum mechanics , engineering
Silica‐filled NR compounds are prepared by mixing rubber with organic‐networked silica and additives such as curatives, processing and coupling agents, and stabilizer in a dried state (dry‐mixed NR, DNR) and mixing a silica‐NR wet masterbatch prepared in liquid phase with the additives (wet‐mixed NR, WNR). The effects of mixing method and time of DNR and WNR compounds on their cure, process, tensile, and dynamic properties are investigated. The mixing of DNR crushes silica aggregates to smaller ones, but also forms occasionally large ones, while the mixing of WNR produces small aggregates without forming larger ones because silica aggregates are already covered with rubber. The high silica dispersion, suppressed silica aggregation, low Payne effect, and low‐loss modulus of the WNR compounds prepared by mixing for a sufficient time result in their low viscosity, high scorch safety, and low rolling resistance without sacrificing other rubber properties.