Polyurethanes with monodisperse rigid segments based on a diamine-diamine chain extender
- Biemond, G.J.E.
- Braspenning, K.
- Gaymans, R.J.
DOIAbstract
Polyether(bisurethane-bisurea-bisamide)s (PEUUA) based on poly(tetramethylene oxide) (PTMO) were synthesized by chain extension of PTMO endcapped with a diisocyanate (DI), and a diamine-diamide extender. The prepolymers were PTMOs with molecular weights between 1270 and 2200 g mol-1, either endcapped with 4,4-diphenylmethane diisocyanate (MDI), 2,4-toluene diisocyanate (2,4-TDI), or 1,6-hexane diisocyante (HDI) and with a low content of free diisocyanate (<0.1 wt %). The diamine-diamide (6A6) extender was based on hexamethylene diamine (6) and adipic acid (A). In this way, segmented polyurethanes with monodisperse rigid segments (DI-6A6-DI) were obtained. The PEUUAs were characterized by DSC as well as temperature-dependent FTIR and DMTA. T...
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