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Incorporation of polyfluorenes into poly(lactic acid) films for sensor and optoelectronics applications
Author(s) -
Martelo Liliana,
Jiménez Alfonso,
Valente Artur JM,
Burrows Hugh D,
Marques Ana T,
Forster Michael,
Scherf Ullrich,
Peltzer Mercedes,
Fonseca Sofia M
Publication year - 2012
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4176
Subject(s) - materials science , polyelectrolyte , oxygen permeability , thermal stability , luminescence , chemical engineering , differential scanning calorimetry , cationic polymerization , polymer chemistry , phenylene , fluorene , polymer , oxygen , organic chemistry , composite material , chemistry , physics , optoelectronics , engineering , thermodynamics
Abstract Films of neat and plasticized biodegradable poly(lactic acid) (PLA) matrices containing anionic conjugated polyelectrolytes, poly[9,9‐bis(4‐phenoxybutylsulfonate)]fluorene‐2,7‐diyl‐ alt ‐arylenes, with 1,4‐phenylene and 4,4″‐ p ‐terphenylene, respectively, as arylene groups or a neutral poly(9,9‐dialkylfluorene) for comparison were prepared by solution casting. These films were characterized using differential scanning calorimetry, thermogravimetry, scanning electron microscopy and fluorescence spectroscopy. In addition, the effects of plasticizer on the thermal properties and the oxygen permeability of the PLA films were measured through the oxygen transmission rate. Results show that it is possible to obtain thin, optically transparent and luminescent films with potential in oxygen sensing, exhibiting good thermal and photochemical stability. At high polyelectrolyte content, evidence is found for phase separation and aggregate formation and it is no longer possible to obtain completely homogeneous films. The possibility of incorporating the cationic metal complex tris(2,2′‐bipyridyl)ruthenium(II) into plasticized PLA films containing conjugated polyelectrolytes for dual‐wavelength ratiometric luminescence sensing is also discussed. Copyright © 2012 Society of Chemical Industry