Influence of Molecular Weight on Fracture Behavior of Polyphenylquinoxaline Thermosets
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.
KeywordsMold Rubber Brittle Phenyl Oligomer
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