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Thermal and spectroscopic properties of the polydiacetylene derived from docosa‐10,12‐diyne‐1,22‐diylbis(phenylacetate)
Author(s) -
Lindsell W. Edward,
Preston Peter N.,
Tomb Peter J.
Publication year - 1994
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1994.210330110
Subject(s) - diacetylene , thermochromism , conjugated system , polymer , fluorescence , spectroscopy , chemistry , fluorescence spectroscopy , nuclear magnetic resonance spectroscopy , photochemistry , materials science , polymer chemistry , analytical chemistry (journal) , polymerization , stereochemistry , organic chemistry , optics , physics , quantum mechanics
Polydiacetylene ( 2 ) of varying molecular weight has been formed by UV‐ or 60 Co γ‐irradiation of the diacetylene PhCH 2 CO 2 (CH 2 ) 9 ‐CCCC(CH 2 ) 9 O 2 CCH 2 Ph ( 3 ), with conversion of 30−>95%. Samples of ( 2 ) with differing physical properties have been studied, in the bulk phase, by CPMAS 13 C NMR and VIS/UV spectroscopy and by DSC; complementary spectroscopic data on solutions of ( 2 ), including fluorescence studies, are also reported. Spectroscopic studies support the presence of an extended planar conjugated backbone in ‘as polymerised’ blue–black samples of ( 2 ), from which various forms of red‐coloured polymer, with shorter conjugation lengths, can be obtained. Studies of the thermal behaviour indicate the existence of several differing thermal transitions for these materials and the results are discussed.