Conformational aspects of segmented poly(ester-urethanes) |
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Authors: | S Ioan IE Cojocaru VC Grigoras D Macocinschi D Filip |
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Institution: | “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda Nr. 41A, RO-6600 Jassy, Romania |
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Abstract: | Segmented poly(ester-urethanes) containing hard and soft segments, were obtained from aromatic diisocyanates with thiodiglycol or diethylene glycol as chain extenders, and poly(ethylene glycol)adipate usig a multistep polyaddition process. Transition temperatures by differential scanning calorimetry and thermo-optical analysis were employed to characterize polyurethane materials. Changes in the conformation of these polyurethanes were analyzed also, by viscometer measurements in N,N-dimethyl-formamide. The obtained data revealed that the thermal curves are influenced by the soft and hard segment structures in the temperature range studied. |
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Keywords: | differential scanning calorimetry polyurethanes thermal properties thermo-optical analysis viscosity measurements |
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