Auto-hybridization of Polyethylene/Maple Composites: The Effect of Fiber Size and Concentration

This work investigated the effect of maple fiber size and content on the auto-hybridization of linear low density polyethylene (LLDPE) composites. The samples were compounded by twin-screw extrusion and molded by compression molding. Different fiber loadings (5 to 20% wt.), fiber sizes (0-425 micron...

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Bibliographic Details
Published in:Polymers & polymer composites 2017-07, Vol.25 (6), p.471-482
Main Authors: Rodriguez-Castellanos, Wendy, Rodrigue, Denis
Format: Article
Language:English
Subjects:
Carbon
Cellulose
Compacting
Composite materials
Coupling agents
Extrusion molding
Fibers
High density polyethylenes
Hybrid composites
Hybridization
Impact strength
Linear low density polyethylene
Long fibers
Low density polyethylenes
Maples
Modulus of elasticity
Photomicrographs
Physiological aspects
Polyethylene
Polymer matrix composites
Polymers
Pressure molding
Shear tests
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Summary:This work investigated the effect of maple fiber size and content on the auto-hybridization of linear low density polyethylene (LLDPE) composites. The samples were compounded by twin-screw extrusion and molded by compression molding. Different fiber loadings (5 to 20% wt.), fiber sizes (0-425 microns) and size ratios (30/70, 50/50, 70/30 of short, medium, and long fibers) were used to prepare the auto-hybrid composites with 3% of coupling agent (maleated polyethylene). Micrographs and impact strength results showed that the fracture in auto-hybrid composites is mostly dependent on the longer fibers. At 10% wt. the optimum ratio was 30/70 of shorter/longer fibers, which improved tensile strength (20%), tensile modulus (20%), and impact strength (13%) compared with composites with a single fiber size. But at 20% wt., tensile modulus increased by 30% and torsion modulus by 40% above the rule of hybrid mixtures (RoHM) at a 70/30 ratio of shorter/longer fibers.
ISSN:0967-3911
1478-2391
DOI:10.1177/096739111702500606