Abstract
The scratch behavior of a series of model cast polyurethane elastomers (CPU) is investigated according to the ASTM D7027/ISO 19252 scratch test methodology. Four model CPU systems considered in this study were synthesized by the same hard segment, but with four different types of soft segment polyols to systematically alter their phase morphology, coefficient of friction (COF), yield stress, tensile strength and damping behavior. Attenuated total reflectance Fourier transform infrared spectroscopy, atomic force microscopy, COF measurement, uniaxial tensile and compressive true stress-strain curves generation, and dynamic mechanical analysis (DMA) were carried out to link intrinsic material properties to the observed scratch-induced deformation mechanisms of the model CPU systems. The observed scratch damage mechanisms of the model CPU systems are found to correlate well with COF, tensile strength, compressive yield stress and DMA damping behavior. The present study demonstrates that the scratch performance of polymers can be predicted by their intrinsic material properties. Implication of the present study for designing scratch resistant polyurethane elastomers is discussed.
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