Effect of the microstructure of n-butyl acrylate/N-isopropylacrylamide copolymers on their thermo-responsiveness, self-organization and gel properties in water.

Autor: Yin F; IMRCP, UMR 5623, CNRS, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France., Behra JS; IMRCP, UMR 5623, CNRS, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France., Beija M; IMRCP, UMR 5623, CNRS, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France., Brûlet A; Université Paris-Saclay, CNRS, CEA, Laboratoire Léon Brillouin, CEA Saclay, F-91191 GIF/Yvette, France., Fitremann J; IMRCP, UMR 5623, CNRS, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France., Payré B; CMEAB, IFR-BMT, Université de Toulouse, 133 route de Narbonne, 31062 Toulouse, France., Gineste S; IMRCP, UMR 5623, CNRS, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France., Destarac M; IMRCP, UMR 5623, CNRS, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France., Lauth-de Viguerie N; IMRCP, UMR 5623, CNRS, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France. Electronic address: viguerie@chimie.ups-tlse.fr., Marty JD; IMRCP, UMR 5623, CNRS, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France. Electronic address: marty@chimie.ups-tlse.fr.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2020 Oct 15; Vol. 578, pp. 685-697. Date of Electronic Publication: 2020 Jun 09.
DOI: 10.1016/j.jcis.2020.06.005
Abstrakt: Hypothesis: Polymer composition, microstructure, molar mass, architecture… critically affect the properties of thermoresponsive polymers in aqueous media.
Experiments: The behaviour of n-isopropylacrylamide and n-butyl acrylate-based copolymers of variable composition and structure (statistical, diblock or triblock) was studied in solution at different temperatures and concentrations with turbidimetry measurements, differential scanning calorimetry, electronic microscopy, rheology and scattering experiments.
Findings: This study illustrates how it is possible through chemical engineering of the microstructure of amphiphilic thermoresponsive polymers to modulate significantly the self-assembly, morphological and mechanical properties of these materials in aqueous media. Statistical structures induced a strong decrease of cloud point temperature compared to block structures with similar composition. Moreover, block structures lead below the transition temperature to the formation of colloidal structures. Above the transition temperature, the formation of colloidal aggregates is observed at low concentrations, and at higher concentrations the formation of gels. Neutron scattering and light scattering measurements show that for a given composition diblock structures lead to smaller colloids and mesoglobules than their triblock counterparts. Moreover, diblock structures, compared to triblock analogs, allow the formation of gels that do not demix with time (no synaeresis) but that are softer than triblock gels.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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