摘要
研究了氧分子与活性种快速失活的定量关系 ,二代杂质对活性种及聚合物微观结构的影响 .从聚合动力学及聚合物相对分子质量等方面来测定氧分子快速杀死活性种数 ,并考察了体系中氧产生的偶联反应及其对丁苯共聚物物理机械性能、动态力学性能及耐磨性能的影响 .结果表明 :氧对n BuLi THF体系丁苯共聚合有不利影响 .
The effects of oxygen on butadiene\|styrene copolymerization initiated with n-BuLi were studied in this paper.The number of reactive species were investigated by the methods of polymerization kinetics and molecular weight.It was found that lithium reactive species could be killed by oxygen molecules.One oxygen molecule could kill two lithium reactive species.With the increase of the conversion and the oxygen contents,the number of reactive species decreased.The effects of the second\|generation impurities on anionic reactive species and microstructure of copolymers were also introduced.At the same time,the coupling effect of oxygen was found to be obvious.With the increase of the oxygen contents and the reaction temperature,the coupling efficiency increased and the properties of styrene\|butadiene copolymers were affected by the coupling efficiency of oxygen.With the increase of the coupling effect of oxygen,the vulcanized rubber could may exhibit an increased rolling resistance and a reduced wear resistance.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2000年第3期311-314,共4页
Acta Polymerica Sinica
关键词
丁二烯-苯乙烯共聚物
聚合动力学
活性种
氧
Styrene-butadiene copolymer, Reactive species, Polymerization kinetics, Coupling reaction
