Transition-metal-free synthesis of supramolecular ionic alginate-based polyurethanes. (10th February 2017)

• Record Type: Journal Article
• Authors: Daemi, Hamed; Barikani, Mehdi; Sardon, Haritz
• Is Part Of: Carbohydrate polymers. Volume 157(2017)
• Page Start: 1949
• Page End: 1954
• Publication Date: 2017-02-10
• Subjects: Supramolecular polyurethane -- Ionic network -- Alginate -- Metal-free -- Thermal properties; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2016.11.086
• Languages: English
• ISSNs: 0144-8617

Abstract

Graphical abstract: Highlights: Novel alginate-based supramolecular ionic polyurethanes (ASPU) were prepared. Sulfated alginate was used as a chain extender in polyurethane structure for the first time. All of ASPU were synthesized under transition-metal-free conditions. The ASPU showed superior thermal stability at elevated temperatures. Properties of ASPU were extremely dependent on ionic nature of polyurethanes. 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.