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Fluorescence from soluble polythiophenes in uniaxially stretched polymers
Author(s) -
Shiga Tohru,
Ikawa Taiji,
Okada Akane
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980110)67:2<259::aid-app8>3.0.co;2-t
Subject(s) - fluorescence , elongation , polymer , materials science , ultimate tensile strength , conjugated system , steady state (chemistry) , strain (injury) , deformation (meteorology) , composite material , polymer chemistry , chemistry , optics , organic chemistry , medicine , physics
Fluorescence behavior of poly(3‐alkylthiophenes) (P3ATs) in poly(methyl methacrylate) (PMMA) films was studied under tensile loadings. The elastic deformation of the matrix induced by small strains up to 0.2% had a greater influence on time‐resolved fluorescence rather than the steady‐state one from P3ATs. The decay time of fluorescence decreased linearly as the applied stress was increased, and reached a minimum. We maintained that the attractive phenomenon for the time‐resolved fluorescence under the tensile loadings was associated with distortion or deformation of the π‐conjugated structure in P3AT chains having large molecular weight. When the applied strain exceeded the elastic limit of the matrix, the time‐resolved or steady‐state fluorescence behavior was unchanged. However, large elongation over 10% led to the red‐shift of the steady‐state fluorescence maximum and an increase in the decay time. These fluorescence properties, indicating the growth of the π‐conjugation, were mainly governed by strain. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67: 259–266, 1998