Interrelation between extrusion process, formulation and properties of polypropylene/flax fibers composites

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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
Pages17771794; # of pages: 18
SubjectCast film; Composite formulations; Extrusion parameter; Extrusion process; Extrusion temperatures; Feeding zones; Fiber length distributions; Flax fiber; Flow direction; High flexibility; Injection molded part; Injection molding process; Morphological characteristic; Process window; Processability; Reactive agent; Recyclability; Reprocessing cycles; Thermal and mechanical properties; Twin screw extrusion; Coupling agents; Fibers; Flax; Hemp fibers; Linen; Mechanical properties; Polypropylenes; Screws; Thermoplastics; Yarn; Extrusion
AbstractThis work investigates the effect of extrusion parameters and formulation on the properties of polypropylene / short flax fibers composites. The parameters that were varied during the twin-screw extrusion process were screw configuration, screw rate, extrusion temperature and flow rate. The effect of the location of the feeding zone of flax fibers is also considered. Regarding the composite formulation, the effect of flax and hemp content, presence of coupling agent and of a reactive additive on composite properties were analyzed. Composites obtained with hemp fibers in the same extrusion process were also considered for comparison purposes. The materials were characterized in terms of morphological characteristics, fiber length distribution, rheological, thermal and mechanical properties. The variation of extrusion parameters showed that polypropylene / flax fibers composites have a large process window that can be considered as an advantage of PP/flax compounds. Tensile strength evaluated on injection molded parts increased up to 50% with flax fibers content when coupling and reactive agents are used. Due to their high flexibility, flax fibers are less oriented in the flow direction and the mechanical properties will be more isotropic. Furthermore, these composites showed a good recyclability using an injection molding process by keeping the integrity of their mechanical properties after five reprocessing cycles. The processability of these materials using a cast film line and the mechanical properties of obtained sheets are also presented.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute (IMI-IMI)
Peer reviewedYes
NPARC number21271228
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Record identifiereccda865-5231-4f18-84b3-22f630fab27f
Record created2014-03-24
Record modified2016-05-09
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