Abstract
AbstractA novel N‐functionalized multilithium (N‐M‐Li) initiator was synthesized from divinylbenzene (DVB) and lithiohexamethyleneimine (LHMI), and its microstructure and molecular weight distribution were characterized by 1H‐NMR and GPC, respectively. Reaction kinetics of synthesis of N‐M‐Li was also studied and the apparent propagation rate constants of different monomers in this reaction were obtained. Star‐shaped N‐functionalized styrene‐butadiene rubber (SBR) was prepared by anionic polymerization using N‐M‐Li as initiator, N,N,N′,N′‐tetramethylethylenediamine (TMEDA) as polar additive, and cyclohexane as solvent. The molecular weight distribution of the target product was measured by GPC and the result showed that it contained a certain amount of star‐shaped polymers. Three types of SBR were initiated by N‐M‐Li, LHMI, and n‐BuLi, respectively, and then were contrasted in terms of the loss factor (tan δ) by DMA, which demonstrated that N‐M‐Li initiator could provide rubbers with improved hysteresis characteristics. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008
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