Title: Synthesis and characterization of side-chain liquid-crystalline block-copolymers containing laterally attached photoluminescent quinquephenyl units via ATRP
Authors: Wang, Ling-Yung
Li, Kuang-Chieh
Lin, Hong-Cheu
Department of Materials Science and Engineering
Keywords: Side-chain liquid-crystalline polymer;Atom transfer radical polymerization (ATRP);Block-copolymer
Issue Date: 6-Jan-2010
Abstract: 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
ISSN: 0032-3861
DOI: 10.1016/j.polymer.2009.10.071
Journal: POLYMER
Volume: 51
Issue: 1
Begin Page: 75
End Page: 83
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