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Guidotti G, Soccio M, Gazzano M, Siracusa V, Lotti N. 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. Molecules 2023; 28:molecules28104056. [PMID: 37241804 DOI: 10.3390/molecules28104056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 05/04/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
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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Affiliation(s)
- Giulia Guidotti
- Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, 40138 Bologna, Italy
| | - Michelina Soccio
- Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, 40138 Bologna, Italy
- Interdepartmental Center for Industrial Research on Advanced Applications in Mechanical Engineering and Materials Technology, CIRI-MAM, University of Bologna, 40136 Bologna, Italy
| | - Massimo Gazzano
- Organic Synthesis and Photoreactivity Institute, ISOF, CNR, 40129 Bologna, Italy
| | - Valentina Siracusa
- Department of Chemical Science, University of Catania, 95125 Catania, Italy
| | - Nadia Lotti
- Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, 40138 Bologna, Italy
- Interdepartmental Center for Industrial Research on Advanced Applications in Mechanical Engineering and Materials Technology, CIRI-MAM, University of Bologna, 40136 Bologna, Italy
- Interdepartmental Center for Agro-Food Research, CIRI-AGRO, University of Bologna, 47521 Cesena, Italy
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