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Correlation between craze formation and mechanical behaviour of amorphous polymers

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Abstract

The formation, growth and fracture of crazes have been studied for several amorphous polymers (PS, PMMA, SAN, NEC, PC). From bulk polymeric materials 0.5 to 5μm thick sections were prepared and investigated after uniaxial deformation or duringin situ deformation in a 1000 kV high voltage electron microscope (HVEM). The use of the HVEM also allows one to study irradiation-sensitive polymers (PMMA and PC). The size of crazes (length and thickness), the shape (opening angle at the craze tip, craze thickness profile), the thickness of a pre-craze zone, the structure of the material inside the craze (fibrillar or more homogeneous), and the degree of deformation were measured. Correlations have been found between the type and the size of crazes and their mechanical properties, particularly fracture toughness and elongation at break. There are notable differences between unannealed and annealed samples (SAN and PC) as well as in the craze formation and in the fracture toughness.

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Authors and Affiliations

  1. Wissenschaftliches Forschungs- und Koordinierungszentrum für Plast- und Elasterzeugung und -anwendung (WKZ) der chemischen Industrie im Kombinat VEB Chemische Werke Buna, 4212, Schkopau, German Democratic Republic

    G. H. Michler

  2. Institut für Festkörperphysik und Elektronenmikroskopie der Akademie der Wissenschaften der DDR, 4050, Halle/S, German Democratic Republic

    G. H. Michler

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Michler, G.H. Correlation between craze formation and mechanical behaviour of amorphous polymers. J Mater Sci 25, 2321–2334 (1990). https://doi.org/10.1007/BF00638022

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