Mechanical properties–morphology relationships in nano‐/microstructured epoxy matrices modified with PEO–PPO–PEO block copolymers |
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| Authors: | Maider Larrañaga Elena Serrano Maria Dolores Martin Agnieszka Tercjak Galder Kortaberria Koro de la Caba Carmen Cristina Riccardi Iñaki Mondragon |
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| Affiliation: | 1. Materals + Technologies Group Dpto. Ing. Química y M Ambiente, Escuela Univ Politécnica, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Pza Europa, 1, 20018 Donostia/San Sebastián, Spain;2. Institute of Materials Science and Technology (INTEMA), University of Mar de Plata and National Research Council (CONICET), JB Justo 4320‐(7600) Mar de Plata, Argentina;3. Materals + Technologies Group Dpto. Ing. Química y M Ambiente, Escuela Univ Politécnica, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Pza Europa, 1, 20018 Donostia/San Sebastián, SpainMaterals + Technologies Group Dpto. Ing. Química y M Ambiente, Escuela Univ Politécnica, Universidad del País Vasco/Euskal Herriko Unibertsitatea, Pza Europa, 1, 20018 Donostia/San Sebastián, Spain |
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| Abstract: | Epoxy‐based blends containing poly(ethylene oxide)‐co‐poly(propylene oxide)‐co‐poly(ethylene oxide) (PEO–PPO–PEO) block copolymers with different PEO/PPO molar ratios have been investigated in order to analyze the effect of the generated morphologies and interactions between components on the mechanical properties of the blends. Mechanical, morphological and dynamic mechanical analyses indicate that the observed increase of flexural modulus can be related to the decrease of free volume. In modified systems that remain miscible, an increase of flexural modulus, strength and fracture toughness can be observed. Also, macrophase‐ and microphase‐separated systems show an increase of fracture toughness but not of flexural modulus and strength at low contents of block copolymers. Copyright © 2007 Society of Chemical Industry |
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| Keywords: | epoxy triblock copolymer morphology mechanical properties |
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