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  • Compatible compositions based on aqueous polyurethane dispersions and sodium alginate.

Compatible compositions based on aqueous polyurethane dispersions and sodium alginate.

Carbohydrate polymers (2012-12-12)
Hamed Daemi, Mehdi Barikani, Mohammad Barmar
ABSTRACT

A series of aqueous polyurethane dispersions were synthesized by the reaction of polytetramethylene glycol and isophorone diisocyanate, extended with dimethylol propionic acid. Their chemical structures were characterized using FTIR, (1)H NMR, and (13)C NMR, and thermal properties were determined by DMTA. Then, a number of aqueous polyurethane dispersions-sodium alginate (PUD/SA) compositions were prepared by addition of sodium alginate solution with different concentrations into the aqueous polyurethane dispersion. Characterization of chemical structure and thermal properties of these blends were performed by FTIR, EDX and DMTA, respectively. The morphology of the alginate in polyurethane matrix was studied by SEM. The hydrophilicity of the prepared samples decreases by increasing the content of sodium alginate in blends. These observations were attributed to the increase of hydrophilicity of the blends as a consequence of addition of hydrophilic carboxylate, hydroxyl and ether functional groups of the alginate to them.

MATERIALS
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Product Description

Sigma-Aldrich
Isophorone diisocyanate, 98%, mixture of isomers
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Sigma-Aldrich
Propionic acid, ≥99.5%, FCC, FG
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Propionic acid, natural, 99%, FG
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Propionic acid, puriss. p.a., ≥99.5% (GC)
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Supelco
Propionic acid, analytical standard
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Propionic acid, ACS reagent, ≥99.5%
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Sigma-Aldrich
Poly(tetrahydrofuran), average Mn ~2,000, contains BHT as stabilizer
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Poly(tetrahydrofuran), average Mn ~1,000
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Poly(tetrahydrofuran), average Mn ~2,900
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Propionic acid, BioReagent, suitable for insect cell culture, ~99%
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Propionic acid, ≥99.5%
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