Biodegradation of modified Poly(lactic acid) based biocomposite films under thermophilic composting conditions

2019 ◽  
Vol 76 ◽  
pp. 522-536 ◽  
Author(s):  
Naba Kumar Kalita ◽  
Mukesh Kumar Nagar ◽  
Chethana Mudenur ◽  
Ajay Kalamdhad ◽  
Vimal Katiyar
Keyword(s):  
Lactic Acid ◽  
Poly Lactic Acid ◽  
Biocomposite Films

scholarly journals Controlled Release, Disintegration, Antioxidant, and Antimicrobial Properties of Poly (Lactic Acid)/Thymol/Nanoclay Composites

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1878
Author(s):  
Marina Ramos ◽  
Elena Fortunati ◽  
Ana Beltrán ◽  
Mercedes Peltzer ◽  
Francesco Cristofaro ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Polymer Matrix ◽  
Antimicrobial Properties ◽  
Ternary Systems ◽  
Hydroxyl Group ◽  
Poly Lactic Acid ◽  
Biocomposite Films ◽  
Food Simulant ◽  
Packaged Food ◽  
Binary And Ternary Systems

Nano-biocomposite films based on poly (lactic acid) (PLA) were prepared by adding thymol (8 wt.%) and a commercial montmorillonite (D43B) at different concentrations (2.5 and 5 wt.%). The antioxidant, antimicrobial, and disintegration properties of all films were determined. A kinetic study was carried out to evaluate the thymol release from the polymer matrix into ethanol 10% (v/v) as food simulant. The nanostructured networks formed in binary and ternary systems were of interest in controlling the release of thymol into the food simulant. The results indicated that the diffusion of thymol through the PLA matrix was influenced by the presence of the nanoclay. Disintegration tests demonstrated that the incorporation of both additives promoted the breakdown of the polymer matrix due to the presence of the reactive hydroxyl group in the thymol structure and ammonium groups in D43B. Active films containing thymol and D43B efficiently enhanced the antioxidant activity (inhibition values higher than 77%) of the nano-biocomposites. Finally, the addition of 8 wt.% thymol and 2.5 wt.% D43B significantly increased the antibacterial activity against Escherichia coli and Staphylococcus aureus 8325-4, resulting in a clear advantage to improve the shelf-life of perishable packaged food.

scholarly journals Poly(lactic acid)/Cellulose Films Produced from Composite Spheres Prepared by Emulsion-Solvent Evaporation Method

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 66 ◽  
Author(s):  
Sónia Sousa ◽  
Ana Costa ◽  
Abílio Silva ◽  
Rogério Simões
Keyword(s):  
Lactic Acid ◽  
Surface Chemistry ◽  
Solvent Evaporation ◽  
Degree Of Crystallinity ◽  
Poly Lactic Acid ◽  
Poly Vinyl Alcohol ◽  
Cellulose Films ◽  
Chemically Modified ◽  
Biocomposite Films ◽  
Biocomposite Film

The compound of poly(lactic acid) (PLA) and cellulose was made by the emulsion-solvent evaporation technique in order to obtain spheres which are then compression molded to produce a biocomposite film. The effect of the dispersant (poly(vinyl alcohol)—PVA)/PLA ratio on the spheres yield was studied. Moreover, to evaluate the effect of cellulose particle size and surface chemistry on the process yield, unbleached eucalypt kraft pulp and microcrystalline cellulose (MCC), both unmodified and physically or chemically modified were used. PLA/cellulose spheres were characterized regarding its physical properties. It was found that the spheres yield is essentially determined by the PVA/PLA ratio and the percentage of cellulose incorporation is greatly affected by the surface chemistry of cellulose. Regarding the films, DSC runs showed a significant effect of the cellulose type incorporated into PLA matrix on the cold crystallization temperature and on the degree of crystallinity of the biocomposite films. The measurement of tensile properties of the biocomposite films revealed that the strength, elongation at break and toughness (tensile energy absorption at break) of the films incorporating unmodified and chemically modified MCC were substantially improved.

scholarly journals Biocomposite films based on poly(lactic acid) and chitosan nanoparticles: Elaboration, microstructural and thermal characterization

2018 ◽  
Vol 59 (S1) ◽  
pp. E350-E360 ◽  
Author(s):  
Nibal Hijazi ◽  
Nicolas Le Moigne ◽  
Elisabeth Rodier ◽  
Martial Sauceau ◽  
Thierry Vincent ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Chitosan Nanoparticles ◽  
Thermal Characterization ◽  
Poly Lactic Acid ◽  
Biocomposite Films

The Physical and Mechanical Properties of Biocomposite Films Composed of Poly(Lactic Acid) with Spent Coffee Grounds

2019 ◽  
Vol 824 ◽  
pp. 87-93
Author(s):  
Nattawut Suaduang ◽  
Sukunya Ross ◽  
Gareth M. Ross ◽  
Supatra Pratumshat ◽  
Sararat Mahasaranon
Keyword(s):  
Lactic Acid ◽  
Physical And Mechanical Properties ◽  
Poly Lactic Acid ◽  
Biodegradable Films ◽  
Spent Coffee Grounds ◽  
Elongation At Break ◽  
Biocomposite Films ◽  
Coffee Grounds ◽  
Twin Screw ◽  
Coffee Oil

The aim of this research was to prepare and characterize biocomposite films from poly(lactic acid) (PLA) with spent coffee grounds (SCG). PLA can be derived from renewable resources. The SCG component consists of cellulose, hemicellulose and coffee oil 10.98%. SCG can simultaneously act as plasticizer and filler in the composites that can enhance the mixing process. The PLA/SCG biocomposite films were processed by a twin-screw extruder and blow film extruder. They were prepared by using various SCG concentrations (0%, 5%, 7.5% and 10% of SCG). The Scanning Electron Microscopy (SEM) results showed that the PLA matrix with SCG was miscible and had the SCG was well good distributed. Elongation at break was increased, when the amount of SCG was increased, with the results of PLA and PLA/SCG 10% being 5.07% and 6.63% respectively, while hardness, brittleness and tensile strength decreased. UV-vis spectrophotometric measurement of PLA/SCG biocomposite films showed a considerable reduction in transmission of all UV wavelengths (UV-A, -B and -C) and visible light with increasing SCG content. Hence, in this research, SCG can be used as filler in PLA films in order to produce biodegradable films and developed as agricultural film products. The PLA/SCG biocomposite films have shown good properties and are environmentally friendly.

Mechanical Properties of Biocomposite Films Based on Poly(Lactic Acid) Reinforced with Cellulose Fibers

2018 ◽  
Vol 280 ◽  
pp. 410-414
Author(s):  
T. Jamnongkan ◽  
N. Boonjuban ◽  
J. Sangkhachat ◽  
A. Wattanakornsiri ◽  
Rattanaphol Mongkholrattanasit
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Good Alternative ◽  
Swelling Behavior ◽  
Poly Lactic Acid ◽  
Alternative Reinforcement ◽  
Biocomposite Films ◽  
Biopolymer Composites

In this paper, we intended to study and improve the mechanical properties of poly (lactic acid) (PLA) composites with cellulose fibers from recycled newspapers. The influence of cellulose fiber content on tensile mechanical properties and swelling behavior of biocomposite films were investigated. In addition, the morphological property of biocomposite films was determined by scanning electron microscopy (SEM). It was found that the cellulose fibers have directly affected to the swelling behavior of biocomposite films. In addition, it was found that the cellulose fibers were found embedded between PLA matrices, which resulting to the improvement and increase the mechanical properties of biocomposite films. These findings illustrate that the cellulose fibers from recycled newspaper possesses good fillers and could be a good alternative reinforcement for biopolymer composites.

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