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论文类型： 期刊论文

发表时间： 2008-07-15

发表刊物： JOURNAL OF APPLIED POLYMER SCIENCE

收录刊物： SCIE、EI

卷号： 109

期号： 2

页面范围： 820-824

ISSN号： 0021-8995

关键字： anionic polymerization; initiators; functionalization of polymers; star polymers; high performance polymers

摘要： A 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 H-1-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 delta) by DMA, which demonstrated that N-M-Li initiator could provide rubbers with improved hysteresis characteristics. (C) 2008 Wiley Periodicals, Inc.