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Flax fibre reinforced polypropylene in the melt mixing process
2000 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Polypropylene plaques reinforced with different amounts (20-50%) and lengths (1,5-10mm) of flax fibres were prepared in a batch melt mixing, one step process. A mixing time of 10 minutes, rotor speed of 40 rpm and temperature of mixing of 195°C was found to optimise the strength of the compression moulded composite. Dispersion and wetting of fibre bundles as well as fibre degradation affected the mechanical properties and were functions of the processing variables. In order to improve the interfacial adhesion between the hydrophobic and apolar polypropylene and the hydrophilic and polar flax fibres maleic anhydride grafted PP (MAPP) was used as compatibilizer. The MAPPs were characterised by Fourier transform infrared spectroscopy (FTIR) and viscosity measurements. The influence of different degrees of functionalisation as well as mixing time of the MAPP was investigated by means of mechanical testing and scanning electron microscopy (SEM). It was shown that MAPPs with lower degrees of maleic anhydride and higher molecular weight can increase the composite strength with almost 50% while MAPPs with higher amounts of grafted MA and lower molecular weight had almost no effect on the strength. An explanation involving a chain entanglement argument was delivered.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Flax fibre, PP, MAPP, melt mixing, polypropylene
Keyword [sv]
URN: urn:nbn:se:ltu:diva-42858ISRN: LTU-EX--00/087--SELocal ID: 0d1a48a8-e161-4cf0-bba5-f475a25e34a7OAI: diva2:1016084
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering programmes 1997-2000, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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