Biodegradable polyester films from renewable aleuritic acid: surface modifications induced by melt-polycondensation in air

José Jesús Benítez, José Alejandro Heredia-Guerrero, María Inmaculada de Vargas-Parody, Miguel Antonio Cruz-Carrillo, Victor Morales-Flórez, Nicolás de la Rosa-Fox, Antonio Heredia
2016 Journal of Physics D: Applied Physics  
Good water barrier properties and biocompatibility of long-chain biopolyesters like cutin and suberin have potentiated the design of synthetic mimetic materials. Most of these biopolymers are made out esterified mid-chain functionalized ω-long chain hydroxyacids. Aleuritic (9,10,16-trihydroxypalmitic) acid is one of those polyhydroxylated fatty acids and it is also the major constituent of natural lac resin, a relatively abundant and renewable resource. Insoluble and thermostable films have
more » ... able films have been prepared from aleuritic acid by melt-condensation polymerization in air without using catalysts, an easy and attractive procedure for large scale production. Intended to be used as a protective coating, the barrier performances are expected to be conditioned by the physical and chemical modifications induced by oxygen on the air exposed side. Hence, the chemical composition, texture, mechanical behavior, hydrophobicity, chemical resistance and biodegradation of the film surface have been studied by Attenuated Total Reflection-Fourier Transform Infrared Spectroscopy (ATR-FTIR), Atomic Force Microscopy (AFM), Nanoindentation and Water Contac Angle (WCA). It has been demonstrated that the occurrence of side oxidation reactions conditioned the surface physical and chemical properties of these polyhydroxyester films. Additionally, the addition of palmitic acid to reduce the presence of hydrophilic free hydroxyl groups was found to have a strong influence in these parameters.
doi:10.1088/0022-3727/49/17/175601 fatcat:whhuqkjxpbgnfg3adoyohhjv7y