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|Michel Dana, Sandrine Peyrat, Laurie Verzeaux, David Boudier and Brigitte Closs|
|ScientificTracks Abstracts: J Chem Eng Process Technol|
|Interpenetrating Polymer Networks (IPN) have gained great attention in the last decades, mainly due to their biomedical applications. IPN present properties that can be very different according to the macromolecular constituents and that can be tailored by the process. Currently, IPN are composed of chemical polymers or cross-linked by using chemicals. Our study aimed to develop an IPN based on natural polymers which are chemical free to obtain a biopolymer-based film with âsecond skinâ properties, biosourced, biodegradable and in accordance with the requirements of the cosmetic industry. For this purpose, we studied the influence of different natural polysaccharides molecular mass and their ratio but also the natures and concentration of the cross linker on the IPN properties, in the manufacturing process. This approach led to the development of the ecodesigned and patented IBPN technologyÂ® (Interpenetrating BioPolymer Network). The resulting material is composed of a galactomannans network from Caesalpinia spinosa and of a sulfated galactans network from Kappaphycus alvarezii ionically crosslinked. Thermodynamic analyses by DSC (Differential Scanning Calorimetry) and DMA (Dynamic Mechanical Analyses) associated with visualization by AFM (Atomic Force Microscopy) and SEM (Scanning Electronic Microscopy) revealed the physical-IPN organization of the obtained material. Applied to the skin, this natural physical-IPN forms a âsecond-skinâ film since it protects against mechanical aggressions (-14%, P<0.05), pollutants (-47%, P<0.001) and irritants (-22%). In conclusion, the resulting biopolymer-based film has outstanding âsecond skinâ properties. It is biodegradable and perfectly suitable to the cosmetic industry requirements. The sourcing of the two plants used for its production is sustainable. This study demonstrates the interest of the interpenetrating biopolymer network technology for new promising applications.|
Michel Dana defended his PhD in Organic Chemistry at the University of Bordeaux I in 1996. He works at SILAB since 1997 and is now Manager of the new technology platform.
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