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Microstructure analysis of brominated styrene–butadiene rubber
Author(s) -
Khoee Sepideh,
Sorkhi Maedeh
Publication year - 2007
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20672
Subject(s) - double bond , polybutadiene , bromine , polystyrene , copolymer , styrene , reactivity (psychology) , materials science , polymer chemistry , styrene butadiene , fourier transform infrared spectroscopy , chloroform , organic chemistry , chemistry , polymer , chemical engineering , composite material , engineering , metallurgy , medicine , alternative medicine , pathology
The bromine addition to the SBR double bonds in chloroform at 0°C has been investigated by FTIR, 1 H NMR and DSC techniques. In this case, bromine molecules react exclusively with the polydiene double bonds and the polystyrene units are unaffected. The bromine reacts preferentially with 1,4‐trans double bonds of the polybutadiene segment of SBR. At low bromination level (below 15%) the bromine reacts mainly with the 1,4‐trans double bonds of SBR, while at higher bromination level (up to 30%) the bromine shows the most reactivity toward the vinylic double bond. Above 30%, the addition reaction occurs on 1,4‐trans double bonds. The microstructure of modified and unmodified styrene–butadiene copolymers were fully characterized by 1 H NMR technique. Expanded regions have been utilized to resolve the complex 1 H NMR spectrum and establish the compositional and configurational sequences of styrene–butadiene copolymers. POLYM. ENG. SCI., 47:87–94, 2007. © 2007 Society of Plastics Engineers