Characteristics of composite materials based on PTFE and wollastonite from rice straw

The effect of wollastonite on the properties of polymer composite materials (PCMs) based on polytetrafluoroethylene (PTFE) was investigated. New composite formulations were developed with wollastonite content ranging from 0.1 to 2 wt. %. It was found that the incorporation of wollastonite enhances the mechanical properties of PCMs, resulting in a 35% increase in tensile strength and a 47% improvement in elongation at break. Moreover, the wear resistance of the composites increased by 67-fold compared to pristine PTFE. The investigations were further supported and correlated with thermodynamic and structural analyses. The supramolecular structure of PTFE changes from a ribbon-like to a spherulite-like morphology upon the addition of wollastonite. IR-spectroscopy confirmed the formation of secondary structures derived from oxidized functional groups. Thermodynamic studies revealed that increasing the wollastonite concentration in PCMs led to higher crystallinity and melting enthalpy values.

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