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Materials 2017, 10(9), 998;

Green Composites Based on Blends of Polypropylene with Liquid Wood Reinforced with Hemp Fibers: Thermomechanical Properties and the Effect of Recycling Cycles

Department of Civil Engineering and Architecture, University of Catania, Viale Andrea Doria 6, Catania 95125, Italy
Design and Production Engineering Department, Faculty of Engineering, Ain Shams University, 1 Assarayat St., Abbasiya, Al Waili, Cairo Governorate 1153, Egypt
Institute of Polymer Materials and Plastics Engineering, Clausthal University of Technology, Agricolastr. 6, Clausthal-Zellerfeld 38678, Germany
Institute for Polymers, Composites and Biomaterials, National Research Council, Via Campi Flegrei 34, Pozzuoli 80078, Italy
Authors to whom correspondence should be addressed.
Received: 20 July 2017 / Revised: 22 August 2017 / Accepted: 23 August 2017 / Published: 26 August 2017
(This article belongs to the Special Issue Recycled Materials, Eco-design and 3D Printing)
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Green composites from polypropylene and lignin-based natural material were manufactured using a melt extrusion process. The lignin-based material used was the so called “liquid wood”. The PP/“Liquid Wood” blends were extruded with “liquid wood” content varying from 20 wt % to 80 wt %. The blends were thoroughly characterized by flexural, impact, and dynamic mechanical testing. The addition of the Liquid Wood resulted in a great improvement in terms of both the flexural modulus and strength but, on the other hand, a reduction of the impact strength was observed. For one blend composition, the composites reinforced with hemp fibers were also studied. The addition of hemp allowed us to further improve the mechanical properties. The composite with 20 wt % of hemp, subjected to up to three recycling cycles, showed good mechanical property retention and thermal stability after recycling. View Full-Text
Keywords: Polymer-matrix composites (PMCs); mechanical properties; injection molding; recycling Polymer-matrix composites (PMCs); mechanical properties; injection molding; recycling

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Cicala, G.; Tosto, C.; Latteri, A.; La Rosa, A.D.; Blanco, I.; Elsabbagh, A.; Russo, P.; Ziegmann, G. Green Composites Based on Blends of Polypropylene with Liquid Wood Reinforced with Hemp Fibers: Thermomechanical Properties and the Effect of Recycling Cycles. Materials 2017, 10, 998.

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