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Flexible‐elastic copolymerized polyurethane‐tannin foams
Author(s) -
Basso Maria Cecilia,
Giovando Samuele,
Pizzi Antonio,
Pasch Harald,
Pretorius Nadine,
Delmotte Luc,
Celzard Alain
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.40499
Subject(s) - polyurethane , isocyanate , tannin , materials science , amine gas treating , polymerization , polyester , composite material , condensed tannin , polymer chemistry , chemical engineering , polymer , organic chemistry , chemistry , proanthocyanidin , polyphenol , food science , engineering , antioxidant
Open cell foams obtained by the simultaneous coreaction of condensed flavonoid tannins with an alkoxylated fatty amine and polymeric diphenylmethane isocyanate yielded highly flexible/elastic polyurethane foams. Copolymerized amine/isocyanate/tannin oligomers were identified by 13 C NMR and MALDI‐TOF spectroscopy. In general, between 30% and 50% of natural tannins is added to the components used to obtain polymerisation of the polyurethane. The characteristic of these new, partially biosourced polyurethanes is that the tannin present slows down burning, some of them can be made flame self‐extinguishing and if burning they neither flow nor asperge flaming material around, contrary to what occurs with normal polyurethanes. This limits the possibility of transmitting fire to other materials in the same environment. Cyclic compression tests were carried out showing that after 50 cycles foam recovery was in excess of 80%. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40499.