A new process for the incorporation of old newspaper fibers into polyolefins, such as LDPE, HDPE and PP, was developed based on
the dispersion of paper fibers in a hot polymer solution and the subsequent precipitation of the polyolefins by cooling, which produces a
slurry of polymer with paper fibers. The technique studied in this work is an alternative to the conventional melt compounding and was
expected to provide efficient wetting of fibers by the polymer. The density, hardness and tensile properties of composite specimens prepared
by compression moulding, with filler content ranging from 10% to 40% (w/w), were measured. The tensile strength of HDPE and
PP composites presents a slight decrease at filler concentrations between 10% and 20%, followed by considerable decrease in the range of
30–40%. On the other hand, the modulus of elasticity did not display a clear dependence on filler content. Composites based on LDPE
showed good retention of tensile strength especially at low filler content, whereas their modulus of elasticity at 40% fiber concentration,
increased by 78%.
A new process for the incorporation of old newspaper fibers into polyolefins, such as LDPE, HDPE and PP, was developed based onthe dispersion of paper fibers in a hot polymer solution and the subsequent precipitation of the polyolefins by cooling, which produces aslurry of polymer with paper fibers. The technique studied in this work is an alternative to the conventional melt compounding and wasexpected to provide efficient wetting of fibers by the polymer. The density, hardness and tensile properties of composite specimens preparedby compression moulding, with filler content ranging from 10% to 40% (w/w), were measured. The tensile strength of HDPE andPP composites presents a slight decrease at filler concentrations between 10% and 20%, followed by considerable decrease in the range of30–40%. On the other hand, the modulus of elasticity did not display a clear dependence on filler content. Composites based on LDPEshowed good retention of tensile strength especially at low filler content, whereas their modulus of elasticity at 40% fiber concentration,increased by 78%.
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