1. Nanostructured epoxies based on the self-assembly of block copolymers: a new miscible block that can be tailored to different epoxy formulations
- Author
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and Julio Borrajo, Sara Maiez-Tribut, Roberto J. J. Williams, Jean Pierre Pascault, Ezequiel R. Soule, Lesur, Hélène, Ingénierie des Matériaux Polymères - Laboratoire des Matériaux Macromoléculaires (IMP-LMM), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université Jean Monnet [Saint-Étienne] (UJM)-Centre National de la Recherche Scientifique (CNRS), Instituto de Investigaciones en Ciencia y Tecnologia de Materiales [Mar del Plata] (INTEMA), Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Facultad de Ingeniería [Mar del Plata], and Universidad Nacional de Mar del Plata [Mar del Plata] (UNMdP)-Universidad Nacional de Mar del Plata [Mar del Plata] (UNMdP)
- Subjects
[CHIM.POLY] Chemical Sciences/Polymers ,Diglycidyl ether ,Materials science ,Recubrimientos y Películas ,Polymers and Plastics ,Físico-Química, Ciencia de los Polímeros, Electroquímica ,Thermosetting polymer ,FOS: Physical sciences ,INGENIERÍAS Y TECNOLOGÍAS ,Condensed Matter - Soft Condensed Matter ,Miscibility ,Inorganic Chemistry ,chemistry.chemical_compound ,Ingeniería de los Materiales ,Materials Chemistry ,Copolymer ,Methyl methacrylate ,Condensed Matter - Materials Science ,Organic Chemistry ,Ciencias Químicas ,Materials Science (cond-mat.mtrl-sci) ,Epoxy ,Solvent ,[CHIM.POLY]Chemical Sciences/Polymers ,chemistry ,Polymerization ,Chemical engineering ,visual_art ,visual_art.visual_art_medium ,Soft Condensed Matter (cond-mat.soft) ,CIENCIAS NATURALES Y EXACTAS - Abstract
Nanostructured thermosets may be obtained by self-assembly of amphiphilic block copolymers in a reactive solvent and fixation of the morphologies by the cross-linking reaction. Nanostructuration requires the presence of a bock that remains miscible in the polymer during polymerization. The selection of the miscible block depends on the particular system and in some cases (e.g., for epoxy-amine network based on diglycidyl ether of bisphenol A, and 4,4'- diaminodiphenylsulfone) it is very difficult to find such a block. In this manuscript it is shown that random copolymers of methyl methacrylate (MMA) and N,N-dimethylacrylamide (DMA) containing different molar fractions of DMA, can be used as a miscible block for the nanostructuration of epoxies. The miscibility of the random copolymer during formation of the epoxy network was first analyzed determining cloud-point conversions as a function of the molar fraction of DMA in the copolymer. A thermodynamic model of the phase separation was performed using the Flory-Huggins model and taking the polydispersities of both polymers into account. A single expression of the interaction parameter based on the theory of random copolymers provided a reasonable fitting of the experimental cloud-point curves. The significant increase in the miscibility produced by using small DMA molar fractions in the copolymer was explained by the high negative value of the binary interaction energy between DMA and the epoxy-amine solvent, associated to the positive value of the interaction energy between DMA and MMA units. Block copolymers with poly(n-butyl acrylate) as the immiscible block and the random copolymer P(MMA-co-DMA) as the miscible block were used for the nanostructuration of epoxy networks. The necessary molar fraction of DMA in the miscible block to stabilize a dispersion of nanosize domains depended on the fraction of the immiscible block., Comment: Author's version of a published article, available at Macromolecules (ACS), http://pubs.acs.org/doi/abs/10.1021/ma062185l
- Published
- 2013
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