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Photoinduced Changes of the Refractive Index in Substituted Fluorenyl‐ p ‐phenylene Copolymers
Author(s) -
Schöfberger Wolfgang,
Zaami Noreddine,
Mahler Kai Arnulf,
Langer Gregor,
Jakopic Georg,
Pogantsch Alexander,
Kern Wolfgang,
Stelzer Franz
Publication year - 2003
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200390063
Subject(s) - copolymer , propylamine , polymer chemistry , polymer , glass transition , thiourea , gel permeation chromatography , materials science , chemistry , photochemistry , organic chemistry , amine gas treating
A series of substituted 9,9′‐dihexylfluorenylene‐ p ‐phenylene copolymers (DFPP) were synthesised via a Suzuki coupling reaction. The copolymers were chemically modified to introduce photoreactive functionalities. Thiocyanate groups (SCN) were attached onto a side chain of the DFPP copolymers. After exposure to UV light the SCN groups underwent photoisomerisation to the corresponding isothiocyanate groups (NCS). A significant change of the refractive index was observed after UV illumination. After this process the polymer was further modified by a gas phase reaction with propylamine to transform the photo‐generated NCS groups to derivatives of thiourea. An additional variation of the refractive index, as well as an increase of the film thickness h (Δ h + 15%), was observed after this reaction. All polymerisation products were characterised by means of gel permeation chromatography, thermoanalysis as well as NMR and IR spectroscopy. The polymers are thermally stable with decomposition temperatures of around 260 °C and glass transition temperatures in the range of 150–155 °C. The polymers display blue photoluminescence, which remains unchanged after UV modification and reaction with propylamine. A convenient way to produce index and relief patterns in films of conjugated polymers is demonstrated.Photoreactive DFPP copolymer and modified products.