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Unusual Photopolymerization Behavior of Amino Acid‐Derived Polydiacetylene Supramolecules
Author(s) -
Yoon Jaewon,
Azizan Kamalrul Azlan Bin,
Yoo Hyun Oh,
Okada Shuji,
Kim JongMan
Publication year - 2009
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200900016
Subject(s) - diacetylene , polydiacetylenes , photopolymer , thermochromism , amphiphile , polymer , photochemistry , materials science , absorbance , aqueous solution , conjugated system , polymer chemistry , chemistry , polymerization , organic chemistry , copolymer , chromatography , composite material
UV‐irradiation of aqueous suspensions of amino acid‐derived amphiphilic diacetylene supramolecules promotes a process that involves initial formation of species that absorb at 640 nm followed by the generation of polymers that have longer wavelength (686 nm) absorbance. The initially formed intermediate polydiacetylenes display substantial colorimetric reversibility while the long wavelength absorbing polymers show irreversible thermochromism during heating and cooling cycles. The long wavelength absorbing polydiacetylenes, formed from amino acid‐derived amphiphilic diacetylene supramolecules, are suggested to have more planer backbone structures that allow more efficient overlap of the conjugated p‐orbitals.