Single crystal structure of crystalline syndiotactic 1,2-polybutadiene
文献类型：期刊论文
| 作者 | Ye, C; Yang, DC; Hu, YM; Zhang, XQ |
| 刊名 | CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE
 |
| 出版日期 | 2003-12-01 |
| 卷号 | 24期号:12页码:2321-2323 |
| 关键词 | Single Crystal Structure Tem Electron Diffraction Technique Syndlotactic 1 2-polybutadiene |
| ISSN号 | 0251-0790 |
| 英文摘要 | The crystalline syndiotactic 1, 2-polybutadiene was synthesized with a catalytic system consisting of iron acetylacetonate [Fe(acac)(3)] triisobutylaluminum [Al(i-Bu)(3)] and diethyl phosphite (DEP), and its single crystal structure was studied by transmission electron microscopy (TEM) and electron diffraction (ED) techniques. The polymer with melting point 179 degreesC was found to have 89.3% 1, 2 content and 86.5% sydiotacticity based on C-13 NMR measurement. The single crystals of the polymer were achieved by melt crystallization of the solution cast thin films at 150 degreesC for 2 h. Bright field electron micrograph shows that the single crystal exhibits a hexagonal prism shape with its long axis along the crystallographic b-axis, as revealed by the corresponding ED pattern. The strong (hk(0)) reflections of the ED pattern indicate that the single crystal possesses a very good crystallographic orientation with the c-axis perpendicular to the film plane. According to the orthorhombic packing of the planar zigzag chains, all of the diffraction points can be indexed, and the unit cell parameters calculated from the ED result are a = 1. 102 nm and b = 0.664 nm. In order to obtain the unit cell parameter c, alpha highly oriented thin film of the polymer was prepared with a special melt drawn technique. The TEM bright field image indicates that the melt drawn thin films contain highly oriented lamellae with their growing direction perpendicular to the drawing direction. The corresponding ED pattern reveals the molecular chains are highly oriented, with the c-axis parallel to the drawing direction. The unit cell parameter c is 0.513 nm, as calculated from the (hk(0)) reflections. |
| 语种 | 英语 |
| WOS记录号 | WOS:000187660500048 |
| 出版者 | HIGHER EDUCATION PRESS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/79677]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Yang, DC |
| 作者单位 | 1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China 2.Chinese Acad Sci, Changchun Inst Appl Chem, Polymer Engn Lab, Changchun 130022, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ye, C,Yang, DC,Hu, YM,et al. Single crystal structure of crystalline syndiotactic 1,2-polybutadiene[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2003,24(12):2321-2323. |
| APA | Ye, C,Yang, DC,Hu, YM,&Zhang, XQ.(2003).Single crystal structure of crystalline syndiotactic 1,2-polybutadiene.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,24(12),2321-2323. |
| MLA | Ye, C,et al."Single crystal structure of crystalline syndiotactic 1,2-polybutadiene".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 24.12(2003):2321-2323. |
入库方式： OAI收割
来源：化学研究所
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