Počet záznamů: 1

Synthesis and thermal behavior of telechelic poly(butadiene)diols with azobenzene-based liquid-crystalline units in side chains

  1. 1.
    0339561 - UMCH-V 2010 RIV DE eng J - Článek v odborném periodiku
    Poláková, Lenka - Sedláková, Zdeňka - Látalová, Petra
    Synthesis and thermal behavior of telechelic poly(butadiene)diols with azobenzene-based liquid-crystalline units in side chains.
    Polymer Bulletin. Roč. 64, č. 4 (2010), s. 315-326 ISSN 0170-0839
    Grant CEP: GA ČR GA202/09/2078
    Výzkumný záměr: CEZ:AV0Z40500505
    Klíčová slova: azobenzene mesogens * radical addition * poly(butadiene)diols
    Kód oboru RIV: CD - Makromolekulární chemie
    Impakt faktor: 1.215, rok: 2010

    Mesogenic thiols with azobenzene as a rigid part and with various substituent (H-, methoxy-, butoxy- or octyloxy-) in para-position of azobenzene ring were synthesized by multi-step syntheses. The thiols were grafted onto double bonds of telechelic poly(butadiene)diol (M (n) similar to 2,400, functionality f (n) = 2, 60 mol.% of 1,2-butadiene units) via radical addition in the presence of 2,2'-azobis(2-methylpropionitrile) (AIBN). Initial mole ratio of thiol/double bonds varied in the range of 0.2-1.0. Influence of the azobenzene substituent on the extent of modification reaction was estimated using elemental analysis, size-exclusion chromatography and H-1 NMR spectroscopy. The substituent on mesogen plays also an important role in thermal behavior of both the thiols and the obtained comb-like polymers, as determined by differential scanning calorimetry and polarizing optical microscopy.
    Trvalý link: http://hdl.handle.net/11104/0005738