Temperature response of aqueous solutions of pyrene end-labeled poly(N-isopropylacrylamide)s probed by steady-state and time-resolved fluorescence

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Fowler , M , Duhamel , J , Qiu , X P , Korchagina , E & Winnik , F M 2018 , ' Temperature response of aqueous solutions of pyrene end-labeled poly(N-isopropylacrylamide)s probed by steady-state and time-resolved fluorescence ' , Journal of Polymer Science. Part B, Polymer Physics , vol. 56 , no. 4 , pp. 308-318 . https://doi.org/10.1002/polb.24543

Title: Temperature response of aqueous solutions of pyrene end-labeled poly(N-isopropylacrylamide)s probed by steady-state and time-resolved fluorescence
Author: Fowler, Michael; Duhamel, Jean; Qiu, Xing Ping; Korchagina, Evgeniya; Winnik, Francoise M.
Contributor organization: Drug Research Program
Department of Chemistry
Faculty of Pharmacy
Polymers
Date: 2018-02-15
Language: eng
Number of pages: 11
Belongs to series: Journal of Polymer Science. Part B, Polymer Physics
ISSN: 0887-6266
DOI: https://doi.org/10.1002/polb.24543
URI: http://hdl.handle.net/10138/308001
Abstract: Aqueous solutions of a series of monodisperse poly(N-isopropylacrylamide)s end-labeled with n-butyl-1-pyrene at one or both chain ends (Py-n-PNIPAMs with n=1 or 2) were studied by turbidimetry, light scattering, and fluorescence. For a given polymer concentration and heating rate, the cloud point (T-c) of an aqueous Py-n-PNIPAM solution, determined by turbidimetry, was found to increase with the number-average molecular weight (M-n) of the polymer. The steady-state fluorescence spectra and time-resolved fluorescence decays of Py-n-PNIPAM aqueous solutions were analyzed and all parameters retrieved from these analyses were found to be affected as the solution temperature passed through T-c, the solution cloud point, and T-m, the temperature where dehydration of PNIPAM occurred. The trends obtained by fluorescence to characterize the aqueous Py-n-PNIPAM solutions as a function of temperature were found to be consistent with the model proposed for telechelic PNIPAM by Koga et al. in 2006. (c) 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018, 56, 308-318
Subject: aggregation
dynamic light scattering
fluorescence
poly(N-isopropylacrylamide)
polyamide
pyrene fluorescence
self-organization
telechelic
thermal properties
thermoresponsive
NEUTRON-SCATTERING
LIGHT-SCATTERING
MOLECULAR-WEIGHT
PHASE-TRANSITION
THERMAL RESPONSE
HYDROGEN-BONDS
WATER
ASSOCIATION
MACROMOLECULES
MESOGLOBULES
116 Chemical sciences
Peer reviewed: Yes
Rights: cc_by_nc
Usage restriction: openAccess
Self-archived version: acceptedVersion


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