Orientation of triblock copolymers in planar extension

Helen H. Lee, Richard A. Register, Damian A. Hajduk, Sol M. Gruner

Research output: Contribution to journalArticlepeer-review

61 Scopus citations


Three commercial styrenic triblock copolymers were subjected to planar extension in a lubricated channel die, as a model for the orientation that may occur during processing operations. Materials that contain cylinders of polystyrene show a pronounced orientation of the cylinder axis in the flow direction, as revealed by small-angle X-ray scattering in the three orthogonal directions. This anisotropy produces small-strain tensile moduli that differ by a factor of 10 or more in the two in-plane directions. A material that contains lamellae of polystyrene shows pronounced orientation of the lamellae in the plane of the sample; in particular, lamellar normals are strongly forbidden from pointing along the flow direction. For similar strains, planar extension is much more effective in orienting these materials than simple shear.

Original languageEnglish (US)
Pages (from-to)1414-1424
Number of pages11
JournalPolymer Engineering and Science
Issue number10
StatePublished - 1996

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Polymers and Plastics
  • Materials Chemistry


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