Disintegrability under composting conditions of plasticized PLA–PHB blends

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Title: Disintegrability under composting conditions of plasticized PLA–PHB blends
Authors: Arrieta, Marina Patricia | López, Juan | Rayón, Emilio | Jiménez, Alfonso
Research Group/s: Análisis de Polímeros y Nanomateriales
Center, Department or Service: Universidad de Alicante. Departamento de Química Analítica, Nutrición y Bromatología
Keywords: Poly(lactic acid) | Poly(hydroxybutyrate) | Blend | Biodegradable | Plasticizers
Knowledge Area: Química Analítica
Issue Date: Oct-2014
Publisher: Elsevier
Citation: Polymer Degradation and Stability. 2014, 108: 307-318. doi:10.1016/j.polymdegradstab.2014.01.034
Abstract: The disintegration under composting conditions of films based on poly(lactic acid)–poly(hydroxybutyrate) (PLA–PHB) blends and intended for food packaging was studied. Two different plasticizers, poly(ethylene glycol) (PEG) and acetyl-tri-n-butyl citrate (ATBC), were used to limit the inherent brittleness of both biopolymers. Neat PLA, plasticized PLA and PLA–PHB films were processed by melt-blending and compression molding and they were further treated under composting conditions in a laboratory-scale test at 58 ± 2 °C. Disintegration levels were evaluated by monitoring their weight loss at different times: 0, 7, 14, 21 and 28 days. Morphological changes in all formulations were followed by optical and scanning electron microscopy (SEM). The influence of plasticizers on the disintegration of PLA and PLA–PHB blends was studied by evaluating their thermal and nanomechanical properties by thermogravimetric analysis (TGA) and the nanoindentation technique, respectively. Meanwhile, structural changes were followed by Fourier transformed infrared spectroscopy (FTIR). The ability of PHB to act as nucleating agent in PLA–PHB blends slowed down the PLA disintegration, while plasticizers speeded it up. The relationship between the mesolactide to lactide forms of PLA was calculated with a Pyrolysis–Gas Chromatography–Mass Spectrometry device (Py–GC/MS), revealing that the mesolactide form increased during composting.
Sponsor: Authors thank Spanish Ministry of Economy and Competitiveness by financial support (MAT2011-28468-C02-01 and MAT2011-28468-C02-02). M.P. Arrieta thanks Generalitat Valenciana for Santiago Grisolía Fellowship (2011/007).
URI: http://hdl.handle.net/10045/44327
ISSN: 0141-3910 (Print) | 1873-2321 (Online)
DOI: 10.1016/j.polymdegradstab.2014.01.034
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.polymdegradstab.2014.01.034
Appears in Collections:INV - NANOBIOPOL - Artículos de Revistas

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