Biodegradation of Moringa oleifera’s polymer blends

ABSTRACT

Vegetable oils are used as a base for the synthesis of polymers and monomers with structures similar to that of petroleum, as plasticizers for conventional polymers and biodegrading additives. The Moringa oleifera oil was extracted from seeds and polymerized after being submitted to 16 h of microwave irradiation without catalysers. This polymer was characterized and the efficiency of the oil polymerization was verified by the reduction of double bonds and the increase of molecular weight up to 50,000 g mol⁻¹. Films produced by a mixture of low-density polyethylene (LDPE) with poly(butylene adipate-co-terephthalate)/poly(lactic acid) (PBAT/PLA) present low tensile resistance and low biodegradation behaviour. In order to improve those properties, the Moringa polymer (PMO) was mixed with LDPE and PBAT/PLA in specific mass concentrations. The films produced with this mixture were characterized and submitted to biodegradation analysis. The PMO behaves as a compatibilizer by improving thermal properties, reducing the crystalline phase and improving the biodegradation behaviour. The biodegradation improved up to five times in comparison to conventional polymers and it restores the mechanical properties.

KEYWORDS:

• Biodegradation
• biopolymers
• blend
• microwaves
• Moringa oleifera

Acknowledgements

The authors also thank Institute of Macromolecules Prof. Eloisa Mano (IMA) for GPC analyses.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors thank the support from Higher Education Personnel Improvement Coordination (CAPES), a foundation linked to the Ministry of Education (MEC) of Brazil, National Counsel of Technological and Scientific Development (CNPQ) and Post-Graduation of Materials Engineering (REDEMAT).