SCRATCH BEHAVIOR OF POLYURETHANE ELASTOMERS WITH VARIATION IN SOFT SEGMENT TYPE

摘要

An investigation on the effect of soft segment type on the scratch performance of cast polyurethane elastomers (CPU) is reported. A series of CPU were synthesized by the same isocyanate and chain extender, 4,4'-methylene diphenyl diisocyanate (MDI) and 1,4-butane diol (BDO), to form the same type of hard segment, with four different soft segments (polyols): polytetramethylene ether glycol (PT), polycaprolactone (PC), ethylene oxide and propylene oxide based polyether polyol (PET) and adipic anhydride based polyester polyol (PES). Scratch tests were carried out according to the ASTM D7027-13 standard. CPU-PET system is observed to exhibit the worst scratch resistance while CPU-PT shows the best. Coefficient of friction measurement, quasi-static uniaxial compression tests as well as dynamic mechanical analysis (DMA) were investigated to correlate with the observed differences in the scratch performance of the CPU model systems.