Synthesis and phase structures of mesogen-jacketed liquid crystalline polymers containing 1,3,4-oxadiazole based side chains
文献类型：期刊论文
| 作者 | Chai, Chun-Peng1,2; Zhu, Xing-Qi1; Wang, Ping1; Ren, Min-Qiao1; Chen, Xiao-Fang1; Xu, Yi-Ding1; Fan, Xing-He1; Ye, Chun1; Chen, Er-Qiang1; Zhou, Qi-Feng1 |
| 刊名 | MACROMOLECULES
 |
| 出版日期 | 2007-12-25 |
| 卷号 | 40期号:26页码:9361-9370 |
| ISSN号 | 0024-9297 |
| DOI | 10.1021/ma071670t |
| 英文摘要 | A series of new monomers of 2,5-bis[(4-tertbutyl-phenyl)-1,3,4-oxadiazole] styrene (M-Ct) and 2,5-bis[(4-alkoxy-phenyl)-1,3,4-oxadiazole] styrene (M-OCm, m is the number of the carbons in the alkoxy groups, m = 8, 10, 12, 14) were synthesized. Conventional radical polymerization of the monomers resulted in a series of new mesogen-jacketed liquid crystalline polymer (MJLCP) containing the 1,3,4-oxadiazole unit. The chemical structures of the monomers were confirmed by elemental analysis, mass spectrometry, H-1 NMR, and IR. The molecular characterization of the corresponding polymers of P-Ct and P-OCms was performed with H-1 NMR, gel permeation chromatography, and thermogravimetric analysis. Their phase structures and transitions were investigated by differential scanning calorimetry, wide-angle X-ray diffraction, and polarized light microscopy experiments. The P-Ct formed the hexatic columnar nematic (phi(HN)) phase that is typical for MJLCPs, wherein the chain molecules were rodlike. The P-OCms exhibited a well-defined smectic A (S-A) phase. As the mesogenic group is laterally jacketed to the polyethylene backbone through a single carbon-carbon bond, the P-OCm. molecule in the SA phase Should be more or less ribbonlike with the backbone squeezed by the parallel aligned side chains on both sides. The transition of the four P-OCms follows the sequence of SA <-> N <-> I. The comparison between P-Ct and P-OCms indicates that the flexibility of the side-chain tails is crucial to determine the LC structures. Namely, simply changing the chemical structures of small portion of the MJLCP may greatly vary the molecular packing behavior and thus the molecular shape in LC phase structures. |
| 语种 | 英语 |
| WOS记录号 | WOS:000251724700023 |
| 出版者 | AMER CHEMICAL SOC |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/62723]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Fan, Xing-He |
| 作者单位 | 1.Peking Univ, Coll Chem & Mol Engn, Minist Educ, Beijing Natl Lab Mol Sci,Key Lab Polymer Chem & P, Beijing 100871, Peoples R China 2.Beijing Inst Technol, Sch Mat Sci & Engn, Beijing 100081, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chai, Chun-Peng,Zhu, Xing-Qi,Wang, Ping,et al. Synthesis and phase structures of mesogen-jacketed liquid crystalline polymers containing 1,3,4-oxadiazole based side chains[J]. MACROMOLECULES,2007,40(26):9361-9370. |
| APA | Chai, Chun-Peng.,Zhu, Xing-Qi.,Wang, Ping.,Ren, Min-Qiao.,Chen, Xiao-Fang.,...&Zhou, Qi-Feng.(2007).Synthesis and phase structures of mesogen-jacketed liquid crystalline polymers containing 1,3,4-oxadiazole based side chains.MACROMOLECULES,40(26),9361-9370. |
| MLA | Chai, Chun-Peng,et al."Synthesis and phase structures of mesogen-jacketed liquid crystalline polymers containing 1,3,4-oxadiazole based side chains".MACROMOLECULES 40.26(2007):9361-9370. |
入库方式： OAI收割
来源：化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。