“…In addition, to overcome environmental pollution and global warming, thermoplastic polymer composites reinforced with natural or renewable fillers such as cellulose nanocrystals, cellulose nanofibrils (CNFs), nanoclays, natural fibers, and so forth have gained lots of attention from industry and academia. [2][3][4][5][6][7][8] Among those renewable nanofillers, CNFs with a diameter of 5-30 nm and an aspect ratio greater than 50, derived from natural cellulosic sources by mechanical disintegration, chemical and enzymatic treatment, have attracted great interest from industry and academia due to their lightweight, nontoxic, recyclability, and biodegradability. Accordingly, PP/CNF composites have been extensively investigated.…”