Structure of isotactic polypropylene in composites with natural fibres in various processing method
[ 1 ] Instytut Technologii i Inżynierii Chemicznej, Wydział Technologii Chemicznej, Politechnika Poznańska | [ P ] employee
2005
Journal year: 2005 | Journal volume: vol. 13 | Journal number: no. 5 (53)
scientific article
english
- natural fibres
- polypropylene
- composites
- polymorphism
- structure
- processing
- pressure
EN The structure of composite polypropylene/natural fibres was investigated. The kind of processing techniques (injection and press methods) and kind of natural fibres (flax and hemp), as well as the form of lignocellulosic materials (long and cut fibres), influenced the supermolecular structure of the isotactic polypropylene matrix in composite systems. In the case of composites prepared by the injection method, a hexagonal form (β) of iPP besides the monoclinic ( α) was created. The amount of the β phase in composites with flax fibres was higher compared to composites with hemp fibres. The content of this polymorph form was increased with fibre loading. The processing of some polypropylene without fibres by injection caused the generation of hexagonal form, but significantly less (~100%) in comparison to the composite materials. In samples prepared by press moulding, when pressure was applied, polypropylene crystallised in the monoclinic form only.
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