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  • Transition-metal-free synthesis of supramolecular ionic alginate-based polyurethanes.

Transition-metal-free synthesis of supramolecular ionic alginate-based polyurethanes.

Carbohydrate polymers (2016-12-19)
Hamed Daemi, Mehdi Barikani, Haritz Sardon
ABSTRACT

Novel high molecular weight alginate-based supramolecular ionic polyurethane (SPU) networks were prepared via the reaction of chemically modified polyanionic alginate and isocyanate-terminated cationic oligourethanes under transition-metal-free conditions. Alginate, a naturally occurring polyanionic carbohydrate diol possessing carboxylate groups, was considered as both chain extender and the anionic part of SPU network. The tailor-made, ionically crosslinked linear alginate-based SPUs illustrated superior thermal stability with a decomposition temperature around 500°C at 10% weight loss which specializes them as highly thermally stable, wonder materials compared to the today's high-tech products.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
2,2-Bis(hydroxymethyl)propionic acid, 98%
Sigma-Aldrich
Isophorone diisocyanate, 98%, mixture of isomers