I see some micro-cracks on surface of PU. AFM phase images suggests that two phases; one rich in hard segment and one rich in soft segment exist on the surface as well as some micro-cracks on the surface. I am wondering to know if the phase segregation would induce creation of these cracks.
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Janusz Rebis
Could you show us AFM images? How polyurethane were made (OAE+DCDA+MDI) ????
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Dustin W. Janes
Seems like "Environmental Stress Cracking" from oxidative degradation which is common in polyurethanes
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Gozde Atikler
If the polyurethane is polyether type, phase segregation may be the cause of surface defects most probably. 4 % addition of plasticizer could solve the problem.
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