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Polarity assessment of thermoresponsive poly(NIPAM-co-NtBA) copolymer films using fluorescence methods.

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dc.contributor.author Szczupak, Boguslaw en
dc.contributor.author Ryder, Alan G. en
dc.contributor.author Togashi, Denisio M. en
dc.contributor.author Rochev, Yuri A. en
dc.contributor.author Gorelov, Alexander en
dc.contributor.author Glynn, Thomas J. en
dc.date.accessioned 2010-07-15T13:37:04Z en
dc.date.available 2010-07-15T13:37:04Z en
dc.date.issued 2010 en
dc.identifier.citation B. Szczupak, A.G. Ryder, D.M. Togashi, Y.A. Rotchev, A.S. Klymchenko, A. Gorelov, and T.J. Glynn (2010). Polarity assessment of thermoresponsive poly(NIPAM-co-NtBA) copolymer films using fluorescence methods. Journal of Fluorescence, 20(3), 719-731, ( 2010). en
dc.identifier.uri http://hdl.handle.net/10379/1201 en
dc.description.abstract The in-situ, non-contact, and non-destructive measurement of the physicochemical properties such as the polarity of thin, hydrophilic polymer films is desirable in many areas of polymer science. Polarity is a complex factor and encompasses a range of non-covalent interactions including dipolarity/polarizability and hydrogen bonding. A polarity measurement method based on fluorescence would be ideal, but the key challenge is to identify suitable probes which can accurately measure specific polarity related parameters. In this manuscript we assess a variety of fluorophores for measuring the polarity of a series of relatively hydrophilic, thermoresponsive N-isopropylacrylamide/N-tert-butylacrylamide (NIPAM/NtBA) copolymers. The emission properties of both pyrene and 3-Hydroxyflavone (3-HF) based fluorophores were measured in dry polymer films. In the case of pyrene, a relatively weak, linear relationship between polymer composition and the ratio of the first to the third vibronic band of the emission spectrum (I1/I3) is observed, but pyrene emission is very sensitive to temperature and thus not suitable for robust polarity measurements. The 3-HF fluorophores which can undergo an excited-state intramolecular proton transfer (ESIPT) reaction have a dual band fluorescence emission that exhibits strong solvatochromism. Here we used 4¿-diethylamino-3-hydroxyflavone (FE), 5,6-benzo-4¿-diethylamino-3-hydroxyflavone (BFE), and 4´-diethylamino-3-hydroxy-7-methoxyflavone (MFE). The log ratio of the dual band fluorescence emission (log (IN*/IT*)) of 3-HF doped, dry, NIPAM-NtBA copolymer films were found to depend linearly on copolymer composition, with increasing hydrophobicity (greater NtBA fraction) leading to a decrease in the value of log (IN*/IT*). However, the ESIPT process in the polymer matrix was found to be irreversible, non-equilibrated and occurs over a much longer timescale in comparison to the results previously reported for liquid solvents. en
dc.format application/pdf en
dc.language.iso en en
dc.publisher Springer en
dc.subject ESIPT en
dc.subject 3-Hydroxyflavone en
dc.subject Pyrene en
dc.subject Proton-Transfer en
dc.subject Polarity en
dc.subject Thermoresponsive en
dc.subject Polymer en
dc.subject Fluorescence en
dc.subject Information technology en
dc.title Polarity assessment of thermoresponsive poly(NIPAM-co-NtBA) copolymer films using fluorescence methods. en
dc.type Article en
dc.local.publishedsource http://dx.doi.org/10.1007/s10895-010-0613-5 en
dc.local.publisherstatement The original publication is available at www.springerlink.com en
dc.description.peer-reviewed peer-reviewed en

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