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Terahertz Time-Domain Spectroscopy of Thermoresponsive Polymers in Aqueous Solution

Serin, Guillaume and Nguyen, Hong Hanh and Marty, Jean-Daniel and Micheau, Jean-Claude and Gernigon, Véronique and Mingotaud, Anne-Françoise and Bajon, Damienne and Soulet, Thierry and Massenot, Sébastien and Coudret, Christophe Terahertz Time-Domain Spectroscopy of Thermoresponsive Polymers in Aqueous Solution. (2016) Journal of Physical Chemistry B, 120 (36). 9778-9787. ISSN 1520-6106

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Official URL: https://dx.doi.org/10.1021/acs.jpcb.6b06859

Abstract

The behavior of highly concentrated aqueous solutions of two thermoresponsive polymers poly(N-isopropylacrylamide) (PNIPAm) and poly(N-vinylcaprolactam) (PVCL) have been investigated by terahertz time-domain spectroscopy (THz-TDS). Measurements have been performed for concentrations up to 20 wt %, over a frequency range from 0.3 to 1.5 THz and for temperatures from 20 to 45 °C including the zone for lower critical solution temperature (LCST). THz-TDS enables the study of the behavior of water present in the solution (i.e., free or bound to the polymer). From these measurements, in addition to phase transition temperature, thermodynamic data such as variation of enthalpy and entropy can be inferred. Thanks to these data, further insights upon the mechanism involved during the dehydration phenomenon were obtained. These results were compared to the ones issued from dynamic light scattering, spectroscopy, or microscopy techniques to underline the interest to use THz-TDS as a powerful tool to characterize the behavior of thermoresponsive polymers in highly concentrated solutions.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
French research institutions > Bureau de Recherches Géologiques et Minières - BRGM (FRANCE)
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Deposited By: Massenot Sébastien
Deposited On:27 Sep 2017 14:58

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