Biodegradable and non-retrogradable eco-films based on starch-glycerol with citric acid as crosslinking agent
Abstract
Biodegradable and non-retrogradable starch-glycerol based films were obtained using citric acid (CA) as crosslinking agent at 75°C. This material allowed decreasing water vapor permeability (WVP) more than 35%, remained amorphous for at least 45 days as a result of the network formed by the CA that avoided starch retrogradation and maintained the degradability in compost, occurring only six days after the films without citric acid. A simulation of the gelatinization process of starch-glycerol with and without CA, using a differential thermal analysis device, showed that the system with CA completed the gelatinization 5°C before than the other and, CA first reacted with glycerol and then starch-glycerol-CA reaction occurred. The temperature at which the gelatinization process was carried out was critical to obtain the best results. An increase of gelatinization process temperature at 85°C in system with CA, led to a worsening on WVP and its integrity after a swelling process with dimethylsulphoxide (DMSO), compared to the films processed at 75°C.
References
The retrogradation of waxy maize starch extrudates: effects of storage temperature and water content
Influence of citric acid and curing on moisture sorption, diffusion and permeability of starch films
Citations
Transparent Composites Made from Tunicate Cellulose Membranes and Environmentally Friendly Polyester
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