间同立构1,2-聚丁二烯的合成和形态结构研究  

Synthesis and Morphological Structure of Crystalline Syndiotactic 1,2-Polybutadiene

作　　者：陈晔[1] 杨德才[1] 胡雁鸣 张学全 

机构地区：[1]中国科学院长春应用化学研究所高分子物理与化学国家重点实验室 [2]高分子工程实验室,长春130022

出　　处：《高等学校化学学报》2003年第11期2119-2121,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 0 2 3 40 2 0 );国家重大基础研究发展规划项目 (批准号 :G19990 64 80 5 )资助

摘　　要：The crystalline syndiotactic 1,2-polybutadiene was synthesized in a catalytic system consisting of iron acetylacetonate [Fe(acac) 3], triisobutylaluminum [Al(i-Bu) 3] and diethyl phosphite (DEP), and its morphological structure was investigated by transmission electron microscopy (TEM). The polymer with a melting point 179 ℃ was found to have 89.3% 1,2 polybutadiene and 86.5% syndiotacticity based on 13C NMR measurements. The bright field electron micrograph shows that the solution cast film of syndiotactic 1,2-polybutadiene consists of lamellae with lateral scale in micron size. It should be noted that the lamellae have no branching and they are almost parallel each other in localized areas. The lamellar growing direction is along b axis. Surprisingly, the electron diffraction pattern of the film only exhibits strong (hko) reflections, which indicate that the lamellae possess a single crystal-like orientation, i.e., with their c axis perpendicular to the film plane, while a and b axes in the film plane. According to the orthorhombic packing of plane zigzag chains, the cell parameters calculated from the electron diffraction pattern are a=1.102 nm, b=0.664 nm, respectively, which are completely consistent with the results reported by Natta et al..The crystalline syndiotactic 1,2-polybutadiene was synthesized in a catalytic system consisting of iron acetylacetonate [Fe(acac) 3], triisobutylaluminum [Al(i-Bu) 3] and diethyl phosphite (DEP), and its morphological structure was investigated by transmission electron microscopy (TEM). The polymer with a melting point 179 ℃ was found to have 89.3% 1,2 polybutadiene and 86.5% syndiotacticity based on 13C NMR measurements. The bright field electron micrograph shows that the solution cast film of syndiotactic 1,2-polybutadiene consists of lamellae with lateral scale in micron size. It should be noted that the lamellae have no branching and they are almost parallel each other in localized areas. The lamellar growing direction is along b axis. Surprisingly, the electron diffraction pattern of the film only exhibits strong (hko) reflections, which indicate that the lamellae possess a single crystal-like orientation, i.e., with their c axis perpendicular to the film plane, while a and b axes in the film plane. According to the orthorhombic packing of plane zigzag chains, the cell parameters calculated from the electron diffraction pattern are a=1.102 nm, b=0.664 nm, respectively, which are completely consistent with the results reported by Natta et al..

关 键 词：间同立构1 2-聚丁二烯 合成 形态结构 透射电子显微镜 制备 链结构 

分 类 号：O632.12[理学—高分子化学]