Block Polymers pp 195-211 | Cite as

Rheological Properties of Styrene-Ethylene Oxide Block Copolymers: Transition and Melt Flow Behavior

  • Peter F. Erhardt
  • James J. O’Malley
  • Richard G. Crystal
Conference paper

Abstract

The block copolymers described herein are long linear sequences of styrene (non-polar, oleophilic, amorphous) units connected by primary chemical bonds to long linear sequences of ethylene-oxide (polar, hydrophilic, crystallizable) units. Because of the marked chemical dissimilarity of styrene and ethylene oxide, and the polymeric, long chain nature of the segmental units, the components are incompatible and phase separation in the melt is expected and observed. However, because of the primary chemical bonds tieing together the incompatible chain segments, phase separation is not complete and the rheological behavior of one phase is strongly affected by that of the other phase. Block copolymers are unique heterophase systems in this respect and form a distinct class of materials, the study of which should extend our knowledge of the manner of flow of mixed phases. The distinguishing feature of the ethylene oxide/styrene block copolymer system is the sensitivity of the ethylene oxide block to shear. This allows ethylene oxide blocks to be used as sensitive rheological probes.

Keywords

Crystallization Hexane Mold Chloroform MeOH 

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Copyright information

© Plenum Press, New York 1970

Authors and Affiliations

  • Peter F. Erhardt
    • 1
  • James J. O’Malley
    • 1
  • Richard G. Crystal
    • 1
  1. 1.Xerox Research LaboratoriesRochesterUSA

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