Urethanes and polyurethanes from suberin .1. Kinetic study

resumo

Within the context of a study on the preparation and the characterization of polyurethanes based on suberin, as a polyol, and conventional polyisocyanates, it was deemed necessary to carry out a preliminary study on the reactivity of the hydroxy functions of suberin. Aliphatic and aromatic mono- and di-isocyanates were tested and the kinetics of this system followed the classical second order up to conversions of about 85%. The influence of the steric hindrance and the electronic factors, linked to the specific structures of both types of isocyanates, was established. (C) 1997 Elsevier Science B.V.

palavras-chave

BEARING FURAN MOIETIES; CORK

categoria

Agriculture

autores

Cordeiro, N; Belgacem, MN; Gandini, A; Neto, CP

nossos autores

Grupos

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