采用丙烯腈(AN)与衣康酸(IA)在DMSO/H2O中共聚,计算了两种反应单体的竞聚率:rAN=0.405,rIA=2.946。采用计算机模拟,进一步研究了聚(丙烯腈 co 衣康酸)共聚物的分子结构与转化率的关系。给定自由基共聚反应的初始条件,还模拟了丙烯腈与...采用丙烯腈(AN)与衣康酸(IA)在DMSO/H2O中共聚,计算了两种反应单体的竞聚率:rAN=0.405,rIA=2.946。采用计算机模拟,进一步研究了聚(丙烯腈 co 衣康酸)共聚物的分子结构与转化率的关系。给定自由基共聚反应的初始条件,还模拟了丙烯腈与衣康酸二元共聚物序列分布。随着转化率不同,共聚物中衣康酸的组成相差较大,反应初期大多数的IA共聚单体参加反应,特别是在少量衣康酸作共聚单体时,随着衣康酸的加入,丙烯腈的平均序列长度快速降低。展开更多
A series of trans-1,4-butadiene/isoprene copolymers were prepared using the catalyst system TiCl4/MgCl2-Al（i- Bu）3 with bulk precipitation technology at different temperatures. Monomers reactivity ratios were calcul...A series of trans-1,4-butadiene/isoprene copolymers were prepared using the catalyst system TiCl4/MgCl2-Al（i- Bu）3 with bulk precipitation technology at different temperatures. Monomers reactivity ratios were calculated based on the Kelen-Tiid6s （K-T） method and the Mao-Huglin （M-H） method. The influence of temperature on copolymer composition and polymerization rate was discussed in detail. The increase of reaction temperature brought the decrease of butadiene reactivity ratio rBd and supplied an effective adjustment on copolymers＇ composition distribution.展开更多
文摘采用丙烯腈(AN)与衣康酸(IA)在DMSO/H2O中共聚,计算了两种反应单体的竞聚率:rAN=0.405,rIA=2.946。采用计算机模拟,进一步研究了聚(丙烯腈 co 衣康酸)共聚物的分子结构与转化率的关系。给定自由基共聚反应的初始条件,还模拟了丙烯腈与衣康酸二元共聚物序列分布。随着转化率不同,共聚物中衣康酸的组成相差较大,反应初期大多数的IA共聚单体参加反应,特别是在少量衣康酸作共聚单体时,随着衣康酸的加入,丙烯腈的平均序列长度快速降低。
基金financially supported by the National Key Technology R&D Program of China(No.2011BAE26B05)the Shandong Province Natural Science Fund for Distinguished Young Scholars(No.JQ201213)+2 种基金National Natural Science Foundation of China(No.21174074)Shandong Province Science and Technology Development Plan(No.2012GGA05042)the Major Projects of Independent Innovation Achievements Transformation in Shandong Province(No.2013ZHZX1A0207)
文摘A series of trans-1,4-butadiene/isoprene copolymers were prepared using the catalyst system TiCl4/MgCl2-Al（i- Bu）3 with bulk precipitation technology at different temperatures. Monomers reactivity ratios were calculated based on the Kelen-Tiid6s （K-T） method and the Mao-Huglin （M-H） method. The influence of temperature on copolymer composition and polymerization rate was discussed in detail. The increase of reaction temperature brought the decrease of butadiene reactivity ratio rBd and supplied an effective adjustment on copolymers＇ composition distribution.
