Affiliation:
1. Inorganic Chemistry and Catalysis Group, Debye Institute for Nanomaterials Science and Institute for Sustainable and Circular Chemistry Utrecht University Universiteitsweg 99 3584 CG Utrecht The Netherlands
Abstract
AbstractAlthough biomass‐based alternatives for the manufacturing of bioplastic films are an important aspect of a more sustainable future, their physicochemical properties need to be able to compete with the existing market to establish them as a viable alternative. One important factor that is often neglected is the long‐term stability of renewables‐based functional materials, as they should neither degrade after a day or week, nor last forever. One material showing high potential in this regard, also due to its intrinsic biodegradability and antibacterial properties, is chitosan, which can form stable, self‐standing films. We previously showed that green additives introduce a broad tunability of the chitosan‐based material properties. In this work, we investigate the long‐term stability and related degradation processes of chitosan‐based bioplastics by assessing their physicochemical properties over 400 days. It was found that the film properties change similarly for samples stored in the fridge (4 °C, dark) as at ambient conditions (20 °C, light/dark cycles of the day). Additives with high vapor pressure, such as glycerol, evaporate and degrade, causing both brittleness and discoloration. In contrast, films with the addition of crosslinking additives, such as citric acid, show high stability also over a long time, bearing great preconditions for practical applications. This knowledge serves as a stepping‐stone to utilizing chitosan as an alternative material for renewable‐resourced bioplastic products.
Reference43 articles.
1. Seafood waste: a source for preparation of commercially employable chitin/chitosan materials
2. E. Amsen “Top three myths busted about renewable plastics” can be found underhttps://journeytozerostories.neste.com/plastics/top-three-myths-busted-about-renewable-plastics2022(accessed May 1 2023).
3. PlasticsEurope. “Plastics - the Facts 2020: An analysis of European plastics production demand and waste data” can be found underhttps://issuu.com/plasticseuropeebook/docs/plastics_the_facts-web-dec20202020(accessed July 31 2023).
4. Catalytic Conversion of Structural Carbohydrates and Lignin to Chemicals