Design,synthesis, and characterization of a combined main-chain/side-chain liquid-crystalline polymer based on ethyl cellulose |
| |
| Authors: | Tianhui Hu Helou Xie Jianbo Xiao Hailiang Zhang Erqiang Chen |
| |
| Institution: | (1) Key Laboratory of Polymeric Materials & Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymer Materials of Colleges and Universities of Hunan Province, College of Chemistry, Xiangtan University, 411105 Xiangtan, Hunan Province, China;(2) Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, 100871 Beijing, China; |
| |
| Abstract: | A novel combined main-chain/side-chain liquid-crystalline polymer based on an ethyl cellulose main chain containing azobenzene
mesogens (AzoEC) was successfully synthesized. Molecular characterization of the resulting polymers with different degrees
of substitution (DS) was performed with proton nuclear magnetic resonance (1H NMR), Fourier-transform infrared spectroscopy (FTIR), and gel permeation chromatography (GPC). Thermal stability was investigated
by thermogravimetric analysis (TGA). The phase transitions and liquid-crystalline behavior of these polymers were investigated
by differential-scanning calorimetry (DSC), polarized optical microscopy (POM), and wide-angle X-ray diffraction (WAXD). The
results indicate that DS has substantial effect on the liquid-crystalline behavior of these polymers. AzoEC with low DS only
shows the cholesteric phase similar to ethyl cellulose (EC). However, when DS increases to a specific value, AzoEC begins
to show fascinating supramolecular structures. The supramolecular structure of AzoEC with maximum DS consisted of a large-scale
ordered lamellar structure formed by EC main chains and a small-scale ordered structure formed by azobenzene mesogens. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
