화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.24, No.5, 441-449, May, 2016
DOI10.1007/s13233-016-4062-0  Export Citation
π-Conjugated Polyelectrolytes Derived from 2-Ethynylpyridine: The Effect of Quaternization Agent and Reaction Conditions on the Polymer Structure and SERS Characterization of Nanocomposites with Ag-Nanoparticles
Tomáš Faukner, Libor Slaný, Ivana Šloufová, Jiří Vohlídal, and Jiří Zedník†
  • Faculty of Sciences, Department of Physical and Macromolecular Chemistry, Charles University in Prague, Hlavova, 2030, 128 40 Prague 2, Czech Republic
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The reaction of 2-ethynylpyridine (2EP) with stoichiometric equivalent of an alkyl halide RX (R is ethyl, nonyl, or hexadecyl and X is Br or I) gives a poly(N-alkyl-2-ethynylpyridinium halide) type ionic polymer that belongs to the family of π-conjugated polyelectrolytes (CPEs). Reaction conditions significantly influence configuration of the polymer main chains: polymerization in acetonitrile solution gives polymers with high content of cis units while bulk polymerization provides irregular cis/trans polymers. Increased regularity of the high-cis polymers is documented by the NMR and IR as well as SERS (surface enhanced Raman scattering) spectra measured on Ag-nanoparticles/CPE systems. Both polymerization processes give polymers in which 2EP monomeric units are ionized only from ca one half, which exhibit good stability in air and good solubility in polar solvents such as MeOH, DMF, and DMSO and those with N-ethylpyridinium groups even in water.
Keywords:conjugated polymers;ethynylpyridine;SERS;silver colloid;zwitterionic polymerization;silver nanocomposites;quaternization polymerization;ionic polymers
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