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Mechanical properties (a) tensile strength and (b) tensile modulus of unreinforced polypropylene (PP), untreated hemp and flax fiber reinforced PP (control) and enzymatically treated hemp and flax fiber composites: xylanase + cellulase (Xyl + Cel), polygalacturonase (PG), xylanase (Xyl) and laccase (Lac). *Significantly different from control at P < 0.05 [65]. Reprinted by permission from George et al. [65], Springer Nature, copyright 2016.
