標題: | Synthesis and characterization of side-chain liquid-crystalline block-copolymers containing laterally attached photoluminescent quinquephenyl units via ATRP |
作者: | Wang, Ling-Yung Li, Kuang-Chieh Lin, Hong-Cheu 材料科學與工程學系 Department of Materials Science and Engineering |
關鍵字: | Side-chain liquid-crystalline polymer;Atom transfer radical polymerization (ATRP);Block-copolymer |
公開日期: | 6-一月-2010 |
摘要: | A series of novel side-chain liquid-crystalline polymers (SCLCPs) consisting of laterally attached photoluminescent p-quinquephenyl (QQP) pendants with different flexible terminal- and/or side-alkoxy chains were synthesized via atom transfer radical polymerization (ATRP). Homopolymers (HP1-HP3) and block-copolymers (PSP1-PSP3 and PEOP1-PEOP3), where QQP units were copolymerized with styrene or ethylene oxide monomers, possessed the number average molecular weights (M(n)) of 8.7-26.0 x 10(3) with narrow PDI values of 1.08-1.26. Various characterization techniques of polarized optical microscopy (POM), differential scanning calorimetry (DSC), and X-ray diffraction (XRD) were used to investigate their mesomorphic properties, and all homopolymers and block-copolymers exhibited the nematic phase affected by the flexible terminal- and/or side-alkoxy chains of the conjugated rod-like pendants. In addition, the photophysical properties of these polymers were measured by UV-vis and photoluminescence (PL) spectroscopies, which showed blue PL emissions with rather high fluorescence quantum yields in solutions. (C) 2009 Elsevier Ltd. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.polymer.2009.10.071 http://hdl.handle.net/11536/5981 |
ISSN: | 0032-3861 |
DOI: | 10.1016/j.polymer.2009.10.071 |
期刊: | POLYMER |
Volume: | 51 |
Issue: | 1 |
起始頁: | 75 |
結束頁: | 83 |
顯示於類別: | 期刊論文 |