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The disentanglement time of the craze fibrils in polymethylmethacrylate

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Abstract

A breaking time has been defined for the fibrils in the craze at the tip of a steady-state moving crack. It has been shown that, for polymethylmethacrylate above the critical temperature of −20° C, the fibrils of the craze at the crack tip break due to a thermally activated process. The activation energy is equal to 23 kcal mol−1, which corresponds fairly closely to the activation energy of theΒ relaxation. Then, the breaking time is probably a disentanglement time rather than a breaking time of chains, and this may be used to explain the time-temperature behaviour of the macroscopic fracture toughness.

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Trassaert, P., Schirrer, R. The disentanglement time of the craze fibrils in polymethylmethacrylate. J Mater Sci 18, 3004–3010 (1983). https://doi.org/10.1007/BF00700782

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Keywords

  • Polymer
  • Activation Energy
  • Fracture Toughness
  • Fibril
  • Polymethylmethacrylate