The synthesis of a hydroxylated polyurethane, by reduction with diborane of the corresponding carboxylated polymer, is described. The starting polyurethane, of the segmented type, contains as chain extender dihydroxymethylpropionic acid. Various conditions for hydrogenation of the carboxy group have been investigated, and it was possible to transform quantitatively carboxy into hydroxymethyl groups, without hydrogenolytic reactions affecting the main chain of the polymer. The obtained polymer was characterized by chemical titration, viscometry, i.r., NMR and DSC.
SYNTHESIS OF HYDROXYLATED SEGMENTED POLYURETHANES / Marconi, Valter; P., Barontini; Martinelli, Andrea; Piozzi, Antonella. - In: EUROPEAN POLYMER JOURNAL. - ISSN 0014-3057. - STAMPA. - 28:5(1992), pp. 465-469. [10.1016/0014-3057(92)90119-m]
SYNTHESIS OF HYDROXYLATED SEGMENTED POLYURETHANES
MARCONI, Valter;MARTINELLI, Andrea;PIOZZI, Antonella
1992
Abstract
The synthesis of a hydroxylated polyurethane, by reduction with diborane of the corresponding carboxylated polymer, is described. The starting polyurethane, of the segmented type, contains as chain extender dihydroxymethylpropionic acid. Various conditions for hydrogenation of the carboxy group have been investigated, and it was possible to transform quantitatively carboxy into hydroxymethyl groups, without hydrogenolytic reactions affecting the main chain of the polymer. The obtained polymer was characterized by chemical titration, viscometry, i.r., NMR and DSC.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
