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Phase morphology of functionalized polyester polyurethanes. Effect of functional group concentration
Čulin, Jelena ...
Segmented polyester polyurethanes (PU) were prepared based on polycaprolactoneas a soft segment and a hard segment containing isophoronediisocyanate and chain extenders 2,2-bis-(hydroxymethyl) ...propionic acid and 1,4-butanediol with different molar ratios. The changes of crystallinity and morphology due to the incorporation of carboxylic functionalgroups in the hard segment were monitored by wide-angle X-ray diffraction, optical microscopy and differential scanning calorimetry. The concentration of functional groups varied from 0 to 0.45 mmol g-1. The phase separation, the degree of crystallinity and the size of spherulites depend on the interactions imposed by functional groups. A critical level of the concentration of functional groups (0.25 mmol g-1) at which the crystallizability reaches its maximum was observed.
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