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Influence of molecular structure of star S‐SBR on its properties
Author(s) -
Zhao S.,
Zhang X.,
Jin G.
Publication year - 2003
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.11928
Subject(s) - carbon black , materials science , natural rubber , polymer chemistry , star (game theory) , styrene butadiene , composite material , styrene , elastomer , chemical engineering , chemistry , copolymer , polymer , physics , astrophysics , engineering
Star S‐SBR can be produced in one step by a kind of new anion polymerization technology in which modified naphthalene lithium acted as the initiator and SnCl 4 acted as the coupling agent. The influence of the molecular structure of star S‐SBR on its mechanical and dynamic properties was studied. The results showed that Star S‐SBR, with styrene (St) content of 20–25% and vinyl (Bv) content of 45%, and molecular weight for one arm (MW/arm) of 8 ten thousand, has good mechanical properties, low rolling resistance and high wet grip. The end of the S‐SBR molecular chain was coupled by a coupling agent, which resulted in low internal friction loss. The bound rubber content of star S‐SBR‐carbon black compound was larger than that of linear S‐SBR compound. Experiments showed that the Sn—C key in star S‐SBR broke easily under shear action and formed a free group, and the free group bonded immediately with the active group on the surface of a carbon black particle. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2311–2315, 2003