Journal
JOURNAL OF THERMOPLASTIC COMPOSITE MATERIALS
Volume 33, Issue 7, Pages 882-897Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/0892705718815536
Keywords
High loading fiber biocomposite; agricultural waste; physical properties; mechanical properties; micromechanical modeling
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High-fiber loading green composites were prepared from recycled high-density polyethylene (rHDPE)/recycled polyethylene terephthalate (rPET) blend matrix and rice husk (RH) as filler (from 40 wt% up to 80 wt%) via corotating twin-screw extruder and compression molding. The water absorption (WA) upon immersion in sea water, mechanical behavior, and combustion enthalpy of green composites were examined. The WA mechanisms obeyed the Fickian diffusion. The computed diffusion coefficient (D), thermodynamic solubility (S), permeability (P), and orthotropic swelling were generally increased as a function of RH filler. The increment of tensile strength and modulus of composites were maximized up to 16% and 121%, respectively, which was achieved at 70 wt% RH filler. The theoretical prediction of tensile strength and Young's modulus from micromechanical models for random oriented RH fiber/blend composites were compared with the experimental results. As the RH weight fraction increased, the combustion enthalpy decreased (by approximately 30-48%) and thereby the enhancing the fire retardancy of green composite.
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