Publications by authors named "Helene Angellier"
Article Synopsis
- Waxy maize starch nanocrystals were used as a reinforcing agent in a glycerol-plasticized thermoplastic starch matrix, differing from previous studies on natural rubber due to the polar nature of the matrix and similar chemical structures of the filler and matrix.
- The study examined the effects of varying glycerol and filler content, as well as aging, on the material's reinforcing properties through tensile tests, dynamic mechanical analysis (DMA), and X-ray diffraction.
- Strong interactions between the starch nanocrystals and the matrix, primarily due to hydrogen bonding, improved the material's reinforcement and reduced recrystallization during aging in a humid environment.
The surface of waxy maize starch nanocrystals obtained from sulfuric acid hydrolysis of native waxy maize starch granules was chemically modified using two different reagents, namely, alkenyl succinic anhydride and phenyl isocyanate. The occurrence of chemical modification was evaluated by FTIR and X-ray photoelectron spectroscopies. Contact angle measurements from which the surface energy of the materials under investigation was deduced showed that chemical modification led to more hydrophobic particles.
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- The study used response surface methodology to analyze how five factors (temperature, acid concentration, starch concentration, hydrolysis duration, and stirring speed) affect the hydrolysis of waxy maize starch with sulfuric acid.
- The aim was to optimize conditions for creating starch nanocrystals that are small in size, produced quickly, and yield a high output.
- Results showed it was possible to achieve a 15 wt% yield of starch nanocrystals in just 5 days with sulfuric acid, compared to only 0.5 wt% yield from a traditional hydrochloric acid method that took 40 days.