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Starch/PVOH aqueous solutions: a chemical-physical characterization
Paolino Caputo1,2, Valeria Loise1,2, Maria Francesca Colella1,2
1Department of Chemistry and Chemical Technologies, University of Calabria, Via P. Bucci, Rende (CS), 87036, Italy. valeria.loise@unical.it.
Physical Chemistry Chemical Physics : PCCP
|September 23, 2023
Summary
Polyvinyl alcohol (PVOH) stabilizes starch solutions. Starches with higher branching form more structured networks, impacting solution properties and identifying optimal binder solutions.
Area of Science:
- Polymer Science
- Materials Science
- Biochemistry
Background:
- Starch and polyvinyl alcohol (PVOH) are widely used in various applications.
- Understanding their interactions is crucial for developing advanced materials.
- The structural characteristics of starch significantly influence solution properties.
Purpose of the Study:
- To investigate the relationship between starch structure and the physicochemical properties of starch/PVOH solutions.
- To determine the role of starch structure in the formation of binder solutions.
- To identify the optimal starch/PVOH formulation for specific applications.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy for structural analysis.
- Dynamic Shear Rheometer (DSR) for mechanical property evaluation.
- Light scattering measurements for complete solution characterization.
- Thermogravimetric analysis (TGA) to confirm interaction mechanisms.
Main Results:
- PVOH demonstrated a stabilizing effect on the starch/PVOH aqueous solutions.
- Starch with a higher degree of branching formed a more structured network.
- Correlation between NMR, light scattering, and rheology data identified the best performing solution.
- NMR and TGA confirmed the interaction mechanism between starch and PVOH in the film.
Conclusions:
- The degree of starch branching is a key factor in dictating the network structure of starch/PVOH solutions.
- PVOH acts as a stabilizer, enhancing the properties of these solutions.
- The combined analytical approach provides a comprehensive understanding of starch/PVOH interactions and performance.
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