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Small‐angle X‐ray scattering studies on plastically deformed rubber‐modified polystyrene
Author(s) -
Magalhães Arminda M. L.,
Borggreve Rein J. M.
Publication year - 1996
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19961120119
Subject(s) - crazing , materials science , small angle x ray scattering , composite material , polystyrene , natural rubber , toughness , ultimate tensile strength , polybutadiene , shearing (physics) , deformation (meteorology) , cavitation , deformation mechanism , scattering , polymer , copolymer , microstructure , optics , physics , mechanics
The deformation process of blends of polystyrene (PS) and rubbery block copolymers based on polystyrene and hydrogenated polybutadiene (SEBS, Shell Kraton G1651)was studied by Transmission Electron Microscopy (TEM) and Small‐angle X‐ray Scattering (SAXS) on deformed tensile samples, under loaded conditions. When the rubber concentration is increased the impact toughness as well as the elongation at break Increases while the SAXS studies show that the amount of crazing decreases. TEM studies suggest that the main deformation mechanism in these materials is cavitation‐induced shearing. When a crazing agent is incorporated in the disperse phase of rubber‐modified PS the amount of crazing increases more than four times, but the toughness decreases dramatically.