New polypropylene / triticale fiber composites: Interrelation between composition and properties

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Proceedings title26th Annual Technical Conference of the American Society for Composites 2011 and the 2nd Joint US-Canada Conference on Composites
Conference26th Annual Technical Conference of the American Society for Composites 2011 and the 2nd Joint US-Canada Conference on Composites, 26 September 2011 through 28 September 2011, Montreal, QC
Pages18541867; # of pages: 14
SubjectFiber composite; Flexural properties; Maleic anhydride grafted polypropylene; Morphological observations; Processing procedures; Recycling behaviors; Thermal and mechanical properties; Thermoplastic composite; Triticale straws; Twin screw extrusion; Coupling agents; Extrusion; Mechanical properties; Natural fibers; Pelletizing; Reinforcement; Thermoplastics; Polypropylenes; Calcium Oxide; Coupling Agents; Extrusion; Flow Measurement; Natural Fibers; Pelleting; Polypropylene; Reinforcement; Tensile Strength; Thermoplastics
AbstractThis paper discusses the relationship between composition and properties of polypropylene/triticale straw composites. Polypropylene/triticale composites were prepared by twin-screw extrusion process and injection molding. Regarding the appropriate way to feed natural fibers into the process, a pre-extrusion step is necessary because natural fibers are fluffy and hard to feed in this shape without compromise the consistency of fibers flow rate. A special pelletizing step of fibers was added prior to composites extrusion step. The effects of triticale content, the presence of maleic anhydride grafted polypropylene (PP-g-MA) as coupling agent and of CaO as reactive additive in the formulation, on composites properties are discussed. The obtained composites were characterized in terms of morphology and microstructure, rheology, thermal and mechanical properties. The morphological observations show that a good dispersion of triticale straw in polypropylene (PP) can be achieved and an increase in polymer/fiber adhesion at the addition of coupling agent can be obtained. Composite viscosity and mechanical properties were increased with triticale content up to 40 % volume. Mechanical properties were further improved in the presence of PP-g-MA and CaO. The tensile strength was continuously increased from 32.5 MPa up to 44.4 MPa when triticale content increases from 10 at 40 %vol. for the composites formulated with PP-g-MA and CaO. The same trend was observed concerning the flexural properties. The reactive additive (CaO) provides superior strength and modulus and upgrades the triticale from regular filler to reinforcement categories. The recycling behavior and the flammability of composites are also disclosed. The results demonstrate that triticale straw is a good reinforcement with a great potential in thermoplastic composites field if the processing procedure and formulation are appropriate.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute (IMI-IMI)
Peer reviewedYes
NPARC number21271455
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Record identifierc09e7d05-a85f-4547-8708-ee71e4ae1714
Record created2014-03-24
Record modified2016-05-09
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