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Yao Peng,Ning Yan,Jinzhen Cao 한국섬유공학회 2020 Fibers and polymers Vol.21 No.7
Three kinds of tree bark extractives from trembling aspen (Populus tremuloides) (AE), lodgepole pine (Pinuscontorta) (LE), and western red cedar (Thuja plicata) (RE) were produced and used as antioxidants. The antioxidationactivities of those extractives were evaluated and compared with commercial antioxidant butylated hydroxytoluene (BHT). The obtained extractives were applied as natural photostabilizers to produce wood flour/polypropylene (WF/PP) compositesat an addition level of 2 wt%. The composites were subjected to QUV accelerated weathering tester for a total of 1200 h. Thechanges in surface color, surface morphology, and surface chemistry of composites were investigated during the exposure. The results showed that all bark extractives alleviated the photodegradation of composites successfully. Among them, REwas proved to be the most effective. It exhibited excellent UV absorption and similar free-radical inhibition ability comparedwith BHT. Consequently, composites containing RE exhibited less discoloration, less severe surface cracking, and lesschanges in surface chemistry during the whole weathering process. Overall, these results revealed that RE had great potentialas a natural photostabilizer in polymer systems.