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Compatible compositions based on aqueous polyurethane dispersions and sodium alginate
Hamed Daemi1, Mehdi Barikani, Mohammad Barmar
1Iran Polymers and Petrochemicals Institute, PO Box 14965/115, Tehran, Iran.
Carbohydrate Polymers
|December 11, 2012
Summary
New aqueous polyurethane dispersions blended with sodium alginate show altered hydrophilicity. Increasing sodium alginate content decreases water affinity due to added hydrophilic functional groups.
Area of Science:
- Polymer Chemistry
- Materials Science
Background:
- Aqueous polyurethane dispersions (PUDs) are versatile polymers.
- Sodium alginate (SA) is a natural polysaccharide with unique properties.
Purpose of the Study:
- To synthesize and characterize novel aqueous polyurethane dispersions-sodium alginate (PUD/SA) blends.
- To investigate the effect of sodium alginate concentration on the properties of PUDs.
Main Methods:
- Synthesis of PUDs using polytetramethylene glycol, isophorone diisocyanate, and dimethylol propionic acid.
- Characterization via FTIR, NMR (1H, 13C), DMTA, EDX, and SEM.
- Preparation of PUD/SA blends with varying SA concentrations.
Main Results:
- FTIR, NMR, and EDX confirmed the chemical structure and composition of PUD/SA blends.
- DMTA revealed changes in thermal properties with increasing SA content.
- SEM imaging showed the morphology of alginate within the polyurethane matrix.
- Hydrophilicity of the blends decreased as sodium alginate concentration increased.
Conclusions:
- The addition of sodium alginate to aqueous polyurethane dispersions alters their hydrophilicity.
- The observed decrease in hydrophilicity is attributed to the incorporation of hydrophilic functional groups from sodium alginate.
