Investigation of thermo-mechanical, chemical and degradative properties of PLA-limonene films reinforced with cellulose nanocrystals extracted from Phormium tenax leaves

• Published in: European polymer journal Vol. 56; pp. 77 - 91
• Main Authors: Fortunati, E., Luzi, F., Puglia, D., Dominici, F., Santulli, C., Kenny, J.M., Torre, L.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.07.2014; Elsevier
• Subjects: Applied sciences; Cellulose; Cellulose and derivatives; Cellulose nanocrystals; Composites; Computer numerical control; Degradation; Disintegration; Disintegration in composting conditions; Exact sciences and technology; Extraction; Forms of application and semi-finished materials; Nanocrystals; Natural fibres; Natural polymers; Physicochemistry of polymers; Plasticizers; Poly(lactic acid); Polymer industry, paints, wood; Technology of polymers; Thermal properties; Wettability; Thermal properties; Poly(lactic acid); Natural fibres; Disintegration in composting conditions; Cellulose nanocrystals; Biological properties; Strengthening; Monocotyledones; Biodegradability; Cellulose; Chemical isolation; Wettability; Angiospermae; Surface properties; Agavaceae; Nanocomposite; Nanocrystal; Compost; 1,8-p-Menthadiene; Mechanical properties; Plant leaf; Lignocellulosics; Chemical degradation; Experimental study; Hydrolysis; Lactic acid polymer; Plasticizer; Dynamic mechanical properties; Morphology; Spermatophyta; Filler
• ISSN: 0014-3057; 1873-1945
• DOI: 10.1016/j.eurpolymj.2014.03.030

[Display omitted] •Cellulose nanocrystals (CNC) were successfully extracted from Phormium tenax leaves.•Limonene was used as plasticizer for poly(lactic acid) (PLA) based formulations.•PLA_Limonene_CNC bio-nanocomposites were produced by a twin-screw microextruder.•The addition of limonene positively affects the mechanical properties of PLA.•The presence of plasticizer and CNC alters the degradation of PLA bio-nanocomposites. Poly(lactic acid) (PLA) bio-nanocomposite films modified with limonene as plasticizer and reinforced with cellulose nanocrystals (CNC) extracted from agro-waste, such as Phormium tenax leaves, have been prepared by using a twin-screw microextruder and characterized. The extraction of cellulose was carried out by chemical treatment followed by sulphuric acid hydrolysis process. Binary and ternary films containing the plasticizer (20wt.%) and/or the CNC (1 and 3wt.%) were produced and characterized in terms of morphological, thermal, mechanical and wettability properties. The effect of CNC content and the combination with the specific plasticizer on the structural properties of PLA films were also investigated. The addition of limonene into the PLA matrix reduces, as expected, the glass transition temperature of the films, and affects the mechanical properties of the films, increasing the plastic response of PLA. Disintegration study was also carried out under simulated composting conditions in a laboratory-scale test at 58°C, 50% of humidity and in aerobic conditions, demonstrating that the presence of both plasticizer and CNC can alter the degradation rate of developed PLA-based formulations. The successful production of PLA biodegradable nanocomposites incorporating cellulosic material from agro-waste suggested the possible application of these new bio-nanocomposites for active food packaging.