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A TSD current dielectric investigation of the effects of xanthene and perylene dye incorporation in PMMA
Author(s) -
Kalogeras Ioannis M.,
VassilikouDova Aglaia
Publication year - 1999
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19991480122
Subject(s) - materials science , xanthene , perylene , relaxation (psychology) , dielectric , chromophore , polymer , molecule , chemical engineering , photochemistry , chemical physics , polymer chemistry , optoelectronics , organic chemistry , composite material , chemistry , psychology , social psychology , engineering
The potentials of developing tunable lasers with the use of photostable dyes, incorporated at solid‐state hosts of high optical quality, have attracted considerable scientific interest. A critical factor determining the optical response of the dye is related to the extend to which its intrinsic physical and chemical properties are maintained in the environment provided. The thermally stimulated depolarization (TSD) current technique has been employed in order to investigate possible interactions between the typical thermoplastic carrier PMMA and dispersed xanthene and perylene derivatives. The dielectric β‐relaxation of PMMA, related to the (re)orientation of the polar ester carbonyl side groups, exhibits a broad distribution in the relaxation times that remains unaffected by the presence of the dye molecules. The result is supportive of the model considering the chromophores being encapsulated in the polymer without strong (chemical) bonding, in agreement with the observed laser behavior. Further aspects of the dielectric response are discussed in terms of the specific sample preparation procedures and structural relaxation phenomena occurring in PMMA.