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Curing Behavior and Final Properties of Nanostructured Thermosetting Systems Modified with Epoxidized Styrene‐Butadiene Linear Diblock Copolymers
Author(s) -
Serrano Elena,
Tercjak Agnieszka,
Ocando Connie,
Larrañaga Maider,
Parellada M. Dolores,
CoronaGalván Sergio,
Mecerreyes David,
Zafeiropoulos Nikolaos E.,
Stamm Manfred,
Mondragon Iñaki
Publication year - 2007
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200700169
Subject(s) - thermosetting polymer , materials science , copolymer , epoxy , curing (chemistry) , composite material , toughness , polymerization , polymer chemistry , polymer
Nanostructured thermosetting materials based on thermosetting matrices were prepared by modification of an epoxy system with linear PS‐ block ‐PB copolymers. The nanostructured thermosets were obtained through PS block segregation. Depending on the block‐copolymer content in the thermosets and its epoxidation degree, the PS domains can display micellar, worm‐like or hexagonally‐packed cylinder structures, retaining the stiffness of the epoxy matrix, where the hexagonally cylindrical morphology lead to a significant increase in fracture toughness. The rheokinetics of microphase separation during network formation was investigated. Nanostructures are judged to be formed by polymerization‐induced microphase separation, in marked contrast to equilibrium self‐organized structures that are preformed, with the microphases fixed via a curing reaction.