3 years ago

Ecofriendly modification of acetosolv lignin from oil palm biomass for improvement of PMMA thermo-oxidative properties

Ecofriendly modification of acetosolv lignin from oil palm biomass for improvement of PMMA thermo-oxidative properties
Selma Elaine Mazzetto, Morsyleide Freitas Rosa, Diego Lomonaco, Izabel de Menezes Nogueira, Davi Rabelo de Oliveira, Francisco Jonas Nogueira Maia
The environmentally friendly esterification of acetosolv lignin (AL), obtained from pressed oil palm mesocarp fibers, is described, for the improvement of thermo-oxidative properties of poly(methyl methacrylate) (PMMA) films. Acetylation of AL was performed in ecofriendly conditions using acetic anhydride in the absence of catalysts. Acetylated acetosolv lignin (AAL) was successfully obtained in only 12 min with a solvent-free and catalyst-free microwave-assisted procedure. Lignins were characterized by Fourier transform infrared spectroscopy, size exclusion chromatography, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC), confirming the efficacy of the methodology employed. AL and AAL as fillers in different concentrations (1% and 5%) were added to PMMA films. The thermal and mechanical properties of the lignin-incorporated films were analyzed by TGA, DSC, and dynamic mechanical analysis (DMA). The films incorporated with lignin and acetylated lignin presented initial degradation temperature (Tonset) and onset oxidative temperature (OOT) values higher than pure PMMA films, contributing thus to an enhancement of thermo-oxidative stability of PMMA. The DMA analyses showed that incorporation of AL or AAL increased the storage modulus (E′) of PMMA films, but did not affect their glass-transition temperatures (Tg). The results indicate the potential use of oil palm mesocarp lignin to enhance the thermo-oxidative properties of PMMA without compromising its mechanical response. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45498.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/app.45498

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