Abstract
A series of polyurethanes based on Poly(oxytetramethylene)glycol (PTMG), 4,4′-diphenylmethane diisocyanate (MDI) and 2,2-bis-[4-(2-hydroxyethoxy)phenyl]propane (BHPP) was synthesized by two-step solution polymerization varying PTMG soft segment length and hard segment content. Thermal and dynamic mechanical properties were studied by DSC and DMA. Solubility and interactions were calculated and quantitative assessment based on the shift of glass transition temperature and heat capacity change at glass transition was used to predict the extent of phase separation. DSC and DMA results showed that Tg shifted to higher temperature with increasing hard segment content and decreasing soft segment molecular weight, indicating partial phase mixing between hard and soft segment.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have