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- Title
Glycerol-oligo(lactic acid) bioresins as fully biobased modifiers for poly(Lactic acid): synthesis, green chemistry metrics, and the modified PLA film Properties.
- Authors
Alijanian, S.; Zohuriaan-Mehr, M. J.; Esmaeilzadeh, M.; Salimi, A.; Razavi-Nouri, M.
- Abstract
Poly (lactic acid), PLA, a commercially available thermoplastic derived from plant sugars, finds increasing applications in consumer products, disposable packaging, textiles, etc. However, the widespread applications of this bioplastic are limited by its brittleness. This preliminary study inspired a structural analogy with the structure of triglycerides with arms having the nature of PLA itself. Biobased tri-armed toughening additives were synthesized with two oligo (lactic acid) arm lengths. Bio-based resins, or bioresins, are derived from renewable resources such as vegetables. The oligomeric bioresins were characterized by Fourier transform infrared (FTIR) and Nuclear Magnetic Resonance (1 H-NMR and 13 C-NMR) spectroscopies. Easy-to-use green chemistry metrics and simplified life-cycle assessment, i.e., EcoScale and GREEN MOTION scales, were also considered to provide an opening insight into the efficiency and greenness of the processes used to prepare the bioresins. The modifying bioresins (with dosages of 10 and 20 wt%) were blended with PLA to prepare the modified films. Crystallization, mechanical, and thermal properties of the films were evaluated by XRD, tensile experiments, DSC, and TGA apparatuses. The results showed that adding the modifiers improved the flexibility and mechanical properties of the PLA films. The migration and the water vapor permeability tests revealed that the modified films exhibited good resistance against the modifier migration. Overall, this preliminary study indicated a promising modification of the bioplastic PLA using entirely biobased oligomers of its own nature that could be implemented by cost-effective, simple, and clean methods. The modified PLAs might be considered candidates for packaging and additive manufacturing applications.
- Subjects
SUSTAINABLE chemistry; POLYLACTIC acid; NUCLEAR magnetic resonance; BIODEGRADABLE plastics; LACTIC acid; PRODUCT life cycle assessment; RENEWABLE natural resources; SUGAR crops
- Publication
Journal of Polymers & the Environment, 2024, Vol 32, Issue 2, p641
- ISSN
1566-2543
- Publication type
Article
- DOI
10.1007/s10924-023-02987-8