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Electron microscopic investigations of initiation and growth of crazes in polystyrene

  • Polymer Science
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Abstract

The crazes in polystyrene (PS) were investigated by using a high voltage electron microscope (HVEM, accelerating voltage of 1000 kV). The early stages of the formation and the growth of the crazes were studied in detail.

The smallest deformation structures visible are weak domains or microvoids with diameters of 10–15 nm and distances of a few 10 nm between them. They act as craze nuclei and are located in narrow, long “pre-craze” zones. Conclusions are drawn on the processes of initiation and propagation of the crazes; both are based on molecular heterogeneities and on an increasing heterogeneity of deformation. In particular, the transformation of the “closed cell structure” of the voids into the “open cell structure” of the craze fibrils is described.

Growth of crazes in thickness definitely occurs by drawing new polymeric material from the craze boundaries into the craze.

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Author notes

  1. G. H. Michler

    Present address: Institut für Festkörperphysik und Elektronenmikroskopie der Akademie der Wissenschaften der DDR, Halle/S., G.D.R.

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

    G. H. Michler

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  1. G. H. Michler
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Michler, G.H. Electron microscopic investigations of initiation and growth of crazes in polystyrene. Colloid & Polymer Sci 264, 522–532 (1986). https://doi.org/10.1007/BF01422006

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  • DOI: https://doi.org/10.1007/BF01422006

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