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Synthesis and thermal behavior of telechelic poly(butadiene)diols with azobenzene-based liquid-crystalline units in side chains
- 1.0339561 - ÚMCH 2010 RIV DE eng J - Journal Article
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. E-ISSN 1436-2449
R&D Projects: GA ČR GA202/09/2078
Institutional research plan: CEZ:AV0Z40500505
Keywords : azobenzene mesogens * radical addition * poly(butadiene)diols
Subject RIV: CD - Macromolecular Chemistry
Impact factor: 1.215, year: 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.
Permanent Link: http://hdl.handle.net/11104/0005738
Number of the records: 1