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Influence of 1,2‐unit contents on retraction behaviors of SBR vulcanizates
Author(s) -
Choi SungSeen,
Cho Gyunggoo
Publication year - 2006
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.24778
Subject(s) - carbon black , materials science , natural rubber , composite material , filler (materials) , styrene butadiene , glass transition , dispersion (optics) , modulus , polymer , styrene , polymer chemistry , copolymer , physics , optics
Styrene‐butadiene rubber (SBR) has four different repeat units of styrene, cis ‐1,4‐, trans ‐1,4‐, and 1,2‐uints. Influence of the 1,2‐unit content on the retraction behaviors of SBR vulcanizates reinforced with silica or carbon black was studied. The retraction behaviors were compared in terms of the filler systems and the microstructures of SBR. The silica‐filled vulcanizates containing a coupling agent showed nearly the same retraction behaviors as the carbon black‐filled ones, but the silica‐filled vulcanizates without a coupling agent were recovered slower than the carbon black‐filled ones. The vulcanizates with lower 1,2‐unit content started to recover at lower temperature than that with higher 1,2‐unit content. The recovery rate increased with increase of the 1,2‐unit content of SBR. The experimental results were explained with the polymer‐filler interactions, filler dispersion, glass transition temperature, and modulus. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102:4707–4711, 2006