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Toward microphase separation in epoxy systems containing PEO–PPO–PEO block copolymers by controlling cure conditions and molar ratios between blocks

Part 1. Cure kinetics

Colloid and Polymer Science Aims and scope Submit manuscript

Abstract

Nanostructuring of thermosetting systems using the concept of templating and taking advantage of the self-assembling capability of block copolymers is an exciting way for designing new materials for nanotechnological applications. In this first part of the work, reactive blends based on stoichiometric amounts of a diglycidylether of bisphenol-A epoxy resin and 4,4′-diaminodiphenylmethane cure agent modified with three poly(ethylene oxide)-co-poly(propylene oxide)-co-poly(ethylene oxide) block copolymers were studied. Cure advancement of these systems was analyzed by differential scanning calorimetry. The experimental results show a delay of cure rate, which increases as copolymer content and PEO molar ratio in the block copolymer rise. Infrared spectroscopy shows that PEO block is mainly responsible of physical interactions between the hydroxyl groups of growing epoxy thermoset and ether bonds of block copolymer. These interactions are mainly responsible for the delaying of cure kinetics. The molar ratio between blocks also has a critical influence on the delaying of the cure rate. A mechanistic approach of cure kinetics allows us to relate the delay of cure as a consequence of block copolymer adding to physical interactions between components.

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Acknowledgements

Funding for this work was provided by Ministerio de Ciencia y Tecnología (Spain) grants MAT1998-0656, MAT2000-0293, and MAT2001-0714. M. Larrañaga acknowledges financial support (grant for Ph.D.) from the Ministerio de Ciencia y Tecnología. C. C. Riccardi also thanks Gobierno Vasco/Eusko Jaurlaritza for the financial support for a sabbatical year.

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Authors and Affiliations

  1. Materials and Technologies Group, Departamento Ingenieria Quimica y del Medio Ambiente, Escuela Universitaria Politécnica/Unibertsitate Eskola Politeknikoa, Universidad País Vasco/Euskal Herriko Unibertsitatea, Plaza Europa 1, Donostia/San Sebastián, 20018, Spain

    M. Larrañaga, M. D. Martin, N. Gabilondo, G. Kortaberria, A. Eceiza & I. Mondragon

  2. Institute of Materials Science and Technology (INTEMA), University of Mar de Plata and National Research Council (CONICET), J. B. Justo 4320, Mar de Plata, 7600, Argentina

    C. C. Riccardi

Authors
  1. M. Larrañaga
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  2. M. D. Martin
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  3. N. Gabilondo
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  4. G. Kortaberria
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  5. A. Eceiza
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  6. C. C. Riccardi
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  7. I. Mondragon
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Correspondence to I. Mondragon.

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Larrañaga, M., Martin, M.D., Gabilondo, N. et al. Toward microphase separation in epoxy systems containing PEO–PPO–PEO block copolymers by controlling cure conditions and molar ratios between blocks. Colloid Polym Sci 284, 1403–1410 (2006). https://doi.org/10.1007/s00396-006-1512-9

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  • DOI: https://doi.org/10.1007/s00396-006-1512-9

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