Urethanes and polyurethanes from suberin: 1. Kinetic study
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- 作者：Cordeiro ; Nereida ; Belgacem ; Mohamed Naceur ; Gandini ; Alessandro ; Neto ; Carlos Pascoal
- 关键词：Suberin ; Urethane and polyurethanes ; Isocyanates ; Reaction kinetics
- 刊名：Industrial Crops and Products
- 出版年：1997
- 出版时间：May 16, 1997
- 年：1997
- 卷：6
- 期：2
- 页码：163-167
- 全文大小：337 K
文摘
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.