A Mechanistic Study of the Synthesis of Sustainable Carrageenan-Polylactic Acid Biocomposite

• Published in: ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
• Main Authors: Othman, Nor Amira; Zani, Nur Anis Alisya Kamarol; Ramli, Nur Amalina; Azman, Nurul Aini Mohd; Adam, Fatmawati; Bakar, Noor Fitrah Abu; Rehan, Mohammad
• Format: Article; Early Access
• Language: English
• Published: SPRINGER HEIDELBERG 2024
• Subjects: Science & Technology - Other Topics
• Online Access: https://www-webofscience-com.uitm.idm.oclc.org/wos/woscc/full-record/WOS:001159737100003
• ISSN: 2193-567X; 2191-4281
• DOI: 10.1007/s13369-024-08727-x

Environmental friendly biocomposites are urgently needed to mitigate the pollution caused by huge consumption of petroleum-based polymers. Renewable carrageenan and polylactic acid (PLA) natural polymers have the potential to replace petroleum-origin polymers. Nevertheless, the carrageenan and PLA themselves inherit poor tensile strength, hydrophobicity and stability. The aim of this study is to underpin the mechanism of synthesis of carrageenan-PLA biocomposite using van't Hoff plot, 1HNMR and density functional theorem simulation. Strong hydrogen bonding was found at 1.88 angstrom between O atom (carrageenan) and H atom (PLA) and was validated in 1HNMR shifting at 5.3 ppm corresponding to -OH group from PLA. The interaction established in the biocomposite mixed at 50 degrees C leads to a stronger tensile strength of 75.37 MPa, higher hydrophobicity and thermal stability with highest activation energy of 45.39 kJ/mol. The biocomposite produced from renewable carrageenan-PLA material would be a future replacement for nondegradable plastic as a food packaging material.