Morphology and toughness of coextruded PS/PMMA multilayers |
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Authors: | Elena M Ivan'kova Marina Krumova Goerg H Michler Peter P Koets |
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Institution: | Institute of Materials Science, Martin Luther University Halle Wittenberg, 06099, Halle(Saale), Germany Fracture Physics Department, Ioffe Physico-Technical Institute RAS, Politechnicheskaya 26, 194021, St. Petersburg, Russia Department of Materials Technology, Eindhoven University of Technology, WH 4.139, PO box 513, 5600?MB, Eindhoven, The Netherlands
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Abstract: | The micromechanical behaviour of multilayered tapes made of two brittle incompatible amorphous polymers PS and PMMA was studied by means of an optical and a High Voltage Electron Microscope (HVEM). Microlayers of PS and PMMA were coextruded with varying number of layers: 64, 512 and 4096 layers. Mechanical properties of the PS/PMMA tapes were also examined. An increase in layer numbers was found to lead to a decrease in layer thickness that, in turn, resulted in: a) formation of thicker and longer crazes and, therefore, increased volume of the material involved in the plastic deformation; b) a noticeable increase in strength and strain at break (i.e. of toughness) of the samples. Enhanced toughness of the multilayered tapes is accounted for by massive cooperating crazing and yielding of both PS and PMMA phases. |
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