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A simple approach for morphology tailoring of alginate particles by manipulation ionic nature of polyurethanes

Authors
Journal
International Journal of Biological Macromolecules
0141-8130
Publisher
Elsevier
Volume
66
Identifiers
DOI: 10.1016/j.ijbiomac.2014.02.029
Keywords
  • Polyurethane
  • Alginate
  • Elastomer
  • Ionomer
  • Morphology
Disciplines
  • Chemistry

Abstract

Abstract A number of different ionic aqueous polyurethane dispersions (PUDs) were synthesized based on NCO-terminated prepolymers. Two different anionic and cationic polyurethane samples were synthesized using dimethylol propionic acid and N-methyldiethanolamine emulsifiers, respectively. Then, proper amounts of PUDs and sodium alginate were mixed to obtain a number of aqueous polyurethane dispersions–sodium alginate (PUD/SA) elastomers. The chemical structure, thermal, morphological, thermo-mechanical and mechanical properties, and hydrophilicity content of the prepared samples were studied by FTIR, EDX, DSC, TGA, SEM, DMTA, tensile testing and contact angle techniques. The cationic polyurethanes and their blends with sodium alginate showed excellent miscibility and highly stretchable properties, while the samples containing anionic polyurethanes and alginate illustrated a poor compatibility and no significant miscibility. The morphology of alginate particles shifted from nanoparticles to microparticles by changing the nature of PUDs from cationic to anionic types. The final cationic elastomers not only showed better mechanical properties but also were formulated easier than anionic samples.

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