SYNOPSISTo elucidate the effect of lignin addition, polypropylene films containing 2-10 w t % of spruce organosolv lignin and/or beech wood prehydrolysis lignin were compared with lignin-free polymers with respect to tensile strength and elongation before and after aging. The physicochemical properties of the lignin-containing films were investigated by conductivity measurements, surface behavior, and UV and IR spectroscopy. 0
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