Lignin is one of the most available material in earth. Actually can be obtained as a byproduct of the paper industry.<br/>Lignin obtained from coffee husk and recovered by solubilization and precipitation in water was used for the fabrication of polyvinyl alcohol (PVOH) lignin composite films at different lignin/PVOH ratios. Also, an curing agent “Darocur®” and 24 hours of UV exposition was used. Drying process was made by using air in a chamber at 32° C.<br/>Films were characterized by FTIR, UV-Vis, solubility, DSC, SEM and mechanical stress tests according to ASTM D882 and ASTM D547.<br/>Resistance to solubility in water is improved with the increase of the lignin and Darocur® content. The resistance of the films show that the lignin reduce the tensile strength of the composites. Besides, the incorporation of the curing agent improves the tensile strenght, which rise with the increasing of curing agent. SEM images show a smooth surface, free of defects besides the impurities, or lignin particles of large size (fig 2). FTIR spectra shows that the incorporation of Darocur ® improves the order of the polymeric films and is reflected in to a lesser absorbance of the spectra compared with PVOH films.

Lignin- polyvinyl alcohol photo-cured composite films. Effect of lignin and UV curing agent quantity on the mechanical, optical and chemical properties

253rd National Meeting (2017)

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