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Self‐organized MEH‐PPV domains in a TPU matrix and the consequences to the luminescence spectra
Author(s) -
dos Reis Bombardi André,
Laureto Edson,
Duarte José L.,
da Silva Marco A. T.,
Dias Ivan F. L.,
Patrício Patrícia S. O.,
Silva Glaura G.,
Cury Luiz A.
Publication year - 2008
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/app.28491
Subject(s) - photoluminescence , thermoplastic polyurethane , materials science , luminescence , scanning electron microscope , polymer , spectral line , blueshift , polyurethane , conjugated system , polymer chemistry , analytical chemistry (journal) , composite material , chemistry , organic chemistry , physics , optoelectronics , elastomer , astronomy
Self‐sustained cast films formed from heterogeneous blends of poly(2‐methoxy‐5‐(2′‐ethyl‐hexyloxy)‐1,4‐phenylenevinylene) (MEH‐PPV) conjugated polymer and thermoplastic polyurethane (TPU) were investigated by photoluminescence (PL) and scanning electron microscopy (SEM). A blue shift is observed for the pure electronic transition PL peak ( E 00 ) with decreasing MEH‐PPV concentration. The two clear shoulders in the PL spectra at higher energy than the E 00 peak appear due to the formation of small conjugation segments of the MEH‐PPV molecules at the interface of the spherical MEH‐PPV domains. This assumption and the origin of the blue shift were confirmed by correlating the average size of the MEH‐PPV domains, observed from SEM images, and the analysis of the PL spectra at low temperatures. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008