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Influence of vitrification on defect formation during curing of epoxies

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Abstract

Defect formation in epoxies due to the chemical shrinkage was observed during isothermal cure over a wide cure temperature range. The observed defects were cohesive cracks and adhesional failures. The influence of the mutual position of the gel and the glass transition points on shrinkage-defect formation was examined. The different types of the cohesive defects can arise in the curing system in both the rubbery and glassy state. The type of defect formed was found to be determined by the relaxational state of the polymer during defect formation. The dependence of the glass transition temperature upon the degree of polymerization is reported for the epoxy/amine polymer system investigated. Experimental parameters of polymer resistance to chemical shrinkage cracking were measured for all investigated cure temperatures.

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Authors and Affiliations

  1. Department of polymer and composite materials, Institute of Chemical Physics, Russian Academy of Sciences, 142432, Chernogolovka, Moscow region, Russia

    Yu. A. Chekanov, V. N. Korotkov, B. A. Rozenberg, E. A. Dhzavadyan & L. M. Bogdanova

  2. Research Institute of Plastics, 111112, Moscow, Russia

    Yu. P. Chernov & S. G. Kulichikhin

Authors
  1. Yu. A. Chekanov
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  2. V. N. Korotkov
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  3. B. A. Rozenberg
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  4. E. A. Dhzavadyan
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  5. L. M. Bogdanova
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  6. Yu. P. Chernov
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  7. S. G. Kulichikhin
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Chekanov, Y.A., Korotkov, V.N., Rozenberg, B.A. et al. Influence of vitrification on defect formation during curing of epoxies. JOURNAL OF MATERIALS SCIENCE 28, 3869–3873 (1993). https://doi.org/10.1007/BF00353193

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  • DOI: https://doi.org/10.1007/BF00353193

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