Interrelation between melt processing conditions, formulation and properties of polypropylene / short flax and hemp fiber composites

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ConferenceANTEC 2011, May 1-5, 2011, Boston, Massachusetts, USA
Pages# of pages: 6
AbstractThis work investigates the effect of extrusion parameters and formulation on the properties of polypropylene / short flax fiber 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. Concerning the composite formulation, the effect of flax content, presence of coupling agent and of a reactive additive on composite properties are analyzed. Composites obtained with hemp fibers in the same extrusion process are also considered for comparison purposes. The materials were characterized in terms of morphological characteristics, rheological, thermal and mechanical properties. The variation of extrusion parameters shows that polypropylene / flax fibers composites have a large process window that can be considered as an advantage of PP/flax compounding. Tensile strength increased up to 50% with flax fibers content when coupling agent and reactive agent are used. Due to its high flexibility, flax fibers are less oriented in the flow direction and the part performance will be more homogeneous. Furthermore, these composites show a good recyclability by keeping the integrality of their mechanical properties after five reprocessing cycles.
Publication date
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedNo
NRC number53910
NPARC number18474011
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Record identifiere9fc1d1f-5dc8-4aeb-8323-ee127604d5cc
Record created2011-08-23
Record modified2016-05-09
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