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Preparation and optimization of biocomposite material for pultrusion processing
Sousedík, Jan ; Figalla, Silvestr (referee) ; Menčík, Přemysl (advisor)
This thesis focused on the synthesis and subsequent use of polyester resin from renewable natural resources as a matrix for a biocomposite with flax fibre reinforcement. The synthesized bio-based resin was characterized by mass spectrometry (MS) and Fourier-transform infrared spectroscopy (FTIR). The pultrusion was method chosen for the preparation of the composite materials. The optimalisation of the individual components of the composite was carried out as part of the thesis. Two types of composite material were prepared, a composite with fibres surface modified by acetylation and a reference composite with unmodified fibres. The resulting composites were subjected to mechanical properties tests, namely three-point flexural test, tensile test, short beam shear test (SBS), Charpy impact test and dynamic mechanical analysis (DMA). The thermal properties were investigated by differential scanning calorimetry (DSC), heat distortion temperature test (HDT) and thermogravimetric analysis (TGA). In addition, the reinforcement adhesion was monitored by scanning electron microscopy (SEM). Determination of the water absorption of the composites was also carried out. Based on the results of the analyses, a positive effect of the surface treatment of fibres by acetylation on the mechanical properties of the composites was demonstrated.
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