【作者】 于永良； 华静； 张玉冰； 陈滇宝；

【Author】 YU Yongliong HUA Jing ZHANG Yubing CHEN Dianbao (Qingdao Institute of Chemical Technology,Qingdao,266042)

【机构】 青岛化工学院；

【摘要】 采用AC-80（Bruker）FT NMR谱仪测定了球笼烯钕系催化体系Nd（naph）₃-Al（i-Bu）_3-- C₆₀X合成的丁二烯（Bd）-异戊二烯（Ip）共聚物的¹³C-NMR谱（见图1）,在对其脂碳部分进行归属的基础上,测得了共聚物中四种二元结构组成的浓度[BB]、[II]、[BI]和[IB],根据TüDO″S等人修正的计算竞聚率的方法,由共聚物的结构组成,求得了共聚物本体聚合和溶液聚合中丁二烯及异戊二烯的竞聚率,并根据Bernoullion统计模型和一级Markov统计模型,求出了两种模型下丁二烯链节和异戊二烯链节的数均序列长度n_B^-、n_I^-,,与实际测量结果比较,证实了该共聚物的序列分布服从一级Markov统计模型。更多还原

【Abstract】 The ¹³C—NMR spectra of butadiene and isoprene copolymers prepared with C₆₀- supported neodymium catalyst system (Nd（naph）₃-Al（i-Bu）₃-C₆₀-X) in bulk and solution polymerization were determined by AC—80（Bruker） FT NMR （see Fig.1）. On the basis of the assignment of aliphatics carbon in ¹³C—NMR spectra,the contents of [BB]、[Ⅱ]、[BI] and [IB] in copolymer were measured;the monomer reactivity ratios were obtained by using TüDo″s’ method.The dyad distribution composition and number average sequence length of these copolymers were calculated on the basis of assignment of ¹³C—NMR spectra.It was identified that the sequence distribution of monomer units in all copolymers follows first—order Makov statistical model.更多还原