Skip to Content
MilliporeSigma

Molecular engineering of manipulated alginate-based polyurethanes.

Carbohydrate polymers (2014-08-19)
Hamed Daemi, Mehdi Barikani
ABSTRACT

The novel soluble alginate-based polyurethanes in organic solvents were synthesized by the reaction of NCO-terminated prepolymers and tributylammonium alginate (TBA-Alg) for the first time. The chemical structures of synthesized polyurethanes were characterized using FTIR, (1)H NMR and TGA. The reaction completion was confirmed by disappearing of NCO band in FTIR spectra. Furthermore, a peak at 4.71 ppm and some small peaks at a range of 4.12-4.37 ppm in the (1)H NMR of alginate-based polyurethanes were assigned to the backbone of alginate. The results of both FTIR and (1)H NMR were remarkably confirmed by TGA data. The ionic nature of polyurethane backbone not only affects on thermal properties of samples, but it also changes the chemically-bonded alginate morphology. Both polyether and polyester based non-ionic polyurethanes extended by TBA-Alg illustrated the distinct alginate, whereas those ionomers extended by alginate were appeared as the continuous systems at nanoscale.

MATERIALS
Product Number
Brand
Product Description

Supelco
1-Methyl-2-pyrrolidinone, analytical standard
Supelco
N,N-Dimethylformamide, analytical standard
Sigma-Aldrich
N,N-Dimethylformamide, for molecular biology, ≥99%
Sigma-Aldrich
N,N-Dimethylformamide, ACS reagent, ≥99.8%
Sigma-Aldrich
1-Methyl-2-pyrrolidinone, anhydrous, 99.5%
Sigma-Aldrich
1-Methyl-2-pyrrolidinone, SAJ first grade, ≥98.0%
Sigma-Aldrich
N,N-Dimethylformamide, JIS special grade, ≥99.5%
Sigma-Aldrich
N,N-Dimethylformamide, suitable for HPLC, ≥99.9%
Sigma-Aldrich
N,N-Dimethylformamide, SAJ first grade, ≥99.0%
Supelco
Dimethylformamide, Pharmaceutical Secondary Standard; Certified Reference Material
Sigma-Aldrich
N,N-Dimethylformamide, suitable for HPLC, ≥99.9%
Sigma-Aldrich
1-Methyl-2-pyrrolidinone, suitable for HPLC, ≥99%
Sigma-Aldrich
N,N-Dimethylformamide, anhydrous, 99.8%
Sigma-Aldrich
N,N-Dimethylformamide, ReagentPlus®, ≥99%
Sigma-Aldrich
N,N-Dimethylformamide, ACS reagent, ≥99.8%
Sigma-Aldrich
1-Methyl-2-pyrrolidinone, biotech. grade, ≥99.7%
Sigma-Aldrich
N,N-Dimethylformamide, puriss. p.a., ACS reagent, reag. Ph. Eur., ≥99.8% (GC)
Sigma-Aldrich
1-Methyl-2-pyrrolidinone, ACS reagent, ≥99.0%
Sigma-Aldrich
1-Methyl-2-pyrrolidinone, ReagentPlus®, 99%
Sigma-Aldrich
N,N-Dimethylformamide, biotech. grade, ≥99.9%
Sigma-Aldrich
Tributylamine, ≥98.5%
Sigma-Aldrich
Propionic acid, BioReagent, suitable for insect cell culture, ~99%
Sigma-Aldrich
Tributylamine, puriss. plus, ≥99.5% (GC)
Sigma-Aldrich
Isophorone diisocyanate, 98%, mixture of isomers
Supelco
Propionic acid, analytical standard
Sigma-Aldrich
Propionic acid, natural, 99%, FG
Sigma-Aldrich
Tributylamine, puriss. p.a., ≥99.0% (GC)
Sigma-Aldrich
Dimethyl sulfoxide, Vetec, reagent grade, 99%
Sigma-Aldrich
Dimethyl sulfoxide, ≥99.5%
Sigma-Aldrich
Dimethyl sulfoxide solution, 50 wt. % in H2O