Influence of Molecular Weight on Fracture Behavior of Polyphenylquinoxaline Thermosets

  • T. E. Helminiak
  • W. B. Jones
Part of the Polymer Science and Technology book series (POLS, volume 29)


The fracture behavior of a family of polyphenylquinoxaline thermosets has been experimentally investigated, along with a polyphenylquinoxaline thermoplastic. Engineering fracture methods were adapted and applied to small quantities of materials. Miniature compact tension (CT) fracture specimens were fabricated using highly purified material samples, and were tested. The room temperature test results show the samples having low monomeric molecular weight (between reactive end groups) to be comparatively brittle, and samples having progressively higher (monomeric) molecular weight displayed progressively higher fracture toughness. The fracture toughness was found to increase monotonically with molecular weight between reactive end groups or entanglements.


Fracture Toughness Fracture Behavior Compact Tension High Fracture Toughness Phenyl Ether 
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    F.L. Hedberg and F.E. Arnold, J. Appl. Polym. Sci., 24, 763 (1979).CrossRefGoogle Scholar
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    F.L. Hedberg and F.E. Arnold, “Plane Strain Fracture Toughness of Metallic Materials, ” ASTM E399–78a, 1978.Google Scholar
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    Private communications with Dr. Joe S. Ham, Department of Physics, Texas A & M University, College Station, Texas 77841.Google Scholar

Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • T. E. Helminiak
    • 1
  • W. B. Jones
    • 2
  1. 1.AF Wright Aeronautical LabsW-PAFBOhioUSA
  2. 2.Texas Tech UniversityLubbockUSA

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