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Authors
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Serrano, E. ; Tercjak, A. ; Kortaberria, G. ; Pomposo, J. A. ; Mecerreyes, D. ; Zafeiropoulos, N.E. ; Stamm, M. ; Mondragon, I.
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Title
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Nanostructured Thermosetting Systems by Modification with Epoxidized Styrene - Butadiene Star Block Copolymers. Effect of Epoxidation Degree
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Date
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16.03.2006
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Number
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13970
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Abstract
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Novel epoxy-based blends containing 30 wt % star styrene-<I>b</I>-butadiene block copolymers epoxidizedat several degrees (SepB) have been investigated in order to analyze the effect of epoxidation degree on theability of these copolymers to produce nanostructures inside the epoxy matrix as well as their effect on thenetwork structure of the matrix. For neat styrene-butadiene (SB) and SepB15-modified systems, macroscopicphase separation was observed. The SepB epoxidized at 40-76 mol %, however, yielded hexagonally orderednanostructures formed by PS cylinders arranged in the matrix containing also the epoxidized and nonepoxidizedbutadiene units. DSC analysis indicates that the slight diff<br />erences observed in self-assembling of the mixturecontaining the 40 wt % epoxidized block copolymer with respect to those for the blends with higher epoxidationdegrees could be related with reactivity differences of the epoxidized copolymers with the curing agent. It isenvisaged that these novel nanostructured blends may lead to novel materials with excellent optical propertiesand enhanced fracture toughness.
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Publisher
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Macromolecules
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Wikidata
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Citation
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Macromolecules 39 (2006) 2254-2261
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DOI
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https://doi.org/10.1021/ma0515477
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Tags
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mechanical-properties epoxy-resin phase-behavior triblock copolymers natural-rubber diamine blends polymer blends morphology compatibilization crystallization
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