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Solution Properties of Hydrophobically-modified Copolymers of N-Isopropylacrylamide and N-L-Valine Acrylamide: A Study by Fluorescence Spectroscopy and Microcalorimetry.

Abstract : Copolymers of N-( isopropylacrylamide) (NIPAM, 90 mol%) and N-L-valine acrylamide (Val, 10 mol%), as well as their hydrophobically-modified copolymers, namely a copolymer of NIPAM, Val, and N-n-octadecylacrylamide (PNIPAM-Val-C-18, 1 mol%) and a copolymer of NIPAM, Val, and N-[4-( 1-pyrenyl)butyl]-N-n-octadecylacrylamide (PNIPAM-Val-C18Py, 1 mol%) were prepared by free radical copolymerization of the respective monomers. Studies by turbidimetry, microcalorimetry, dynamic light scattering, and fluorescence spectroscopy indicated that the hydrophobically-modified copolymers form polymeric micelles in water (effective hydrodynamic diameter: 25 nm +/- 5 nm). Solutions of all the copolymers underwent pH-dependent phase separation upon heating, but the pH- or temperature-stimulated coil-to-globule collapse/chain expansion did not result in complete disruption of the hydrophobic microdomains.
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https://hal.inrae.fr/hal-02677428
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Submitted on : Sunday, May 31, 2020 - 7:22:15 PM
Last modification on : Thursday, November 12, 2020 - 10:06:06 AM

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Celine Poncet-Legrand, Fm Winnik. Solution Properties of Hydrophobically-modified Copolymers of N-Isopropylacrylamide and N-L-Valine Acrylamide: A Study by Fluorescence Spectroscopy and Microcalorimetry.. British Polymer Journal, 2001, 33 (3), ⟨10.1295/polymj.33.277⟩. ⟨hal-02677428⟩

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