Synthesis and characterization of side-chain liquid-crystalline block-copolymers containing laterally attached photoluminescent quinquephenyl units via ATRP

Ling Yung Wang, Kuang Chieh Li, Hong-Cheu Lin*

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

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 (Mn) of 8.7-26.0 × 103 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.

Original languageEnglish
Pages (from-to)75-83
Number of pages9
Journalpolymer
Volume51
Issue number1
DOIs
StatePublished - 6 Jan 2010

Keywords

  • Atom transfer radical polymerization (ATRP)
  • Block-copolymer
  • Side-chain liquid-crystalline polymer

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