STRESS-STRAIN MEASUREMENTS

• The mechanical behavior is in agreement with the results of the structural characterization (DSC): the two parameters influencing the mechanical behavior are the Tg of the hard phase and the segregation effect of the PFPE moiety

  • The Young modulus is higher than 1000 MPa for all the IPDI coating series, and for the highly crosslinked MC-5-HDI material.
  • A tough-plastic behavior with rupture strain values exceeding 20-30% is achieved only when ZDOL 1000 is present and the soft phase is well segregated (TgF < -50°C)
  • The absence of a segregated rubbery phase in most of the polymers containing ZDOL 500 (with the exception of BC-10-HDI-5) is confirmed by the formation of brittle films with er < 5%.

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