Journal of Materials Science

, Volume 20, Issue 7, pp 2359–2368 | Cite as

Morphology and intersections of crazes in polystyrene films

  • C. C. Chau
  • L. C. Rubens
  • E. B. Bradford


Craze network with interconnecting crazes was produced in thin (~60nm) polystyrene films by using a spherical stretching method. For 30% and 45% radial strain, the average mesh size, defined as the square root of average non-crazed areas enclosed by crazes, decreased from about 28μm to 4.6 and 2.7μm, respectively, as the molecular weight increased from 46 900 to 1 350 000. At a molecular weight of about 106, the interactions between crazes became evident by the split and change of directions at the end of their propagation. Two types of intersection appeared to exist in parallel. The first type showed void formation at the intersections with no apparent fibril displacement effect. The second type showed that the fibrils at the intersection of two perpendicular crazes reoriented to a new direction which seemed to be determined by the relative displacements of the two crazes at the intersections. This observation suggests that the craze fibrils can be displaced and further stretched by a second crazing process.


Polymer Molecular Weight Polystyrene Fibril Mesh Size 
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Copyright information

© Chapman and Hall Ltd 1985

Authors and Affiliations

  • C. C. Chau
    • 1
  • L. C. Rubens
    • 1
  • E. B. Bradford
    • 1
  1. 1.Central Research-Plastics LaboratoryThe Dow Chemical CompanyMidlandUSA

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