Processing, structure and properties of composites based on natural fillers and strereoregular polyolefins : environmentally benign concept

• Main Author: Berková, Kristýna
• Language: English
• Published: Université Blaise Pascal - Clermont-Ferrand II 2013
• Subjects: [CHIM:OTHE] Chemical Sciences/Other; [CHIM:OTHE] Chimie/Autre; Wood polymer composites; Natural fillers composites; Melt viscoelasticity
• Online Access: http://tel.archives-ouvertes.fr/tel-01037987; http://tel.archives-ouvertes.fr/docs/01/03/79/87/PDF/MONTAGOVA_BERKOVA_2013CLF22386.pdf

This doctoral thesis is focused on composites based on polypropylene and wood flour. Firstly, the experimental work deals with preparation of composites based on wood flour with various concentrations and isotactic polypropylene with various melt flow indexes. In terms of this study, one polypropylene, which can have also practical use, was chosen. Further, this polypropylene is investigated with various types and concentrations of wood flour. Also, the attention is devoted to the modification of polypropylene by a specific β-nucleating agent. The differences are compared and described between the composites with neat and nucleated polypropylene. Further, the work is focused on solvent extraction of wood flour. The effect of extraction and solvent of wood flour is also examined in composites with neat and nucleated polypropylene. On prepared composites, the rheological, structural and thermal properties are studied. These properties differ depending on specific type of wood flour, its concentration and specific type of polypropylene.