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    New Random Aromatic/Aliphatic Copolymers of 2,5-Furandicarboxylic and Camphoric Acids with Tunable Mechanical Properties and Exceptional Gas Barrier Capability for Sustainable Mono-Layered Food Packaging

    Year: 2023

    Journal: Molecules, Volume 28, 2023-01, page 4056

    Authors: Guidotti, Giulia; Soccio, Michelina; Gazzano, Massimo; Siracusa, Valentina; Lotti, Nadia

    Keywords: mechanical properties; (1R; 2; 3S)-(+)-Camphoric Acid; 5-furandicarboxylate); 5-furandicarboxylic acid; bio-based copolymers; gas barrier properties; poly(butylene 2; random copolymers; thermal properties

    High molecular weight, fully biobased random copolymers of 2,5-furandicarboxylic acid (2,5-FDCA) containing different amounts of (1R, 3S)-(+)-Camphoric Acid (CA) have been successfully synthesized by two-stage melt polycondensation and compression molding in the form of films. The synthesized copolyesters have been first subjected to molecular characterization by nuclear magnetic resonance spectroscopy and gel-permeation chromatography. Afterward, the samples have been characterized from a thermal and structural point of view by means of differential scanning calorimetry, thermogravimetric analysis, and wide-angle X-ray scattering, respectively. Mechanical and barrier properties to oxygen and carbon dioxide were also tested. The results obtained revealed that chemical modification permitted a modulation of the abovementioned properties depending on the amount of camphoric co-units present in the copolymers. The outstanding functional properties promoted by camphor moieties addition could be associated with improved interchain interactions (π-π ring stacking and hydrogen bonds).
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