Journal
POLYMER COMPOSITES
Volume -, Issue -, Pages -Publisher
WILEY
DOI: 10.1002/pc.27618
Keywords
microfibrillar structure; polypropylene; recycled polyethylene terephthalate; wood-plastic composite
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Sustainable composites based on PP, RPET, and WF were prepared using melt extrusion and drawing process. The addition of WF and oriented RPET significantly improved the tensile strength and elastic modulus of PP. The highly oriented blend showed nonterminal behavior due to physical networks and enhanced microfiber surface area for chemical interactions.
Sustainable composites based on blends from polypropylene (PP) and recycled polyethylene terephthalate (RPET) and wood flour (WF) were prepared under industry-relevant conditions by melt extrusion, followed by continuous drawing through spinnerets. Maleic anhydride grafted polypropylene (PP-g-MA) was employed to improve the compatibility between matrix and WF. The effects of incorporation of WF and RPET microstructure on the morphological features, rheological measurements, and mechanical properties were investigated. The drawing process converted elliptical RPET phase into highly oriented microfibrillar structure, as characterized by means of scanning electron microscopy (SEM). The highly oriented blend (HOB) represented nonterminal behavior due to the presence of physical networks and enhanced surface area of microfibers for chemical interactions. The tensile strength of neat PP increased by the addition of WF and the existence of microfibrillar RPET phase, whereas the microstructure of RPET had more pronounce effect. The tensile strength and elastic modulus of PP reinforced by WF and oriented RPET improved by 65% and 92%, respectively, demonstrating the high potential of this environmental-friendly reinforcement method to intensify the mechanical properties of PP.
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