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The project/research was financed in the framework of the project Lublin University of Technology-Regional Excellence Initiative, funded by the Polish Ministry of Science and Higher Education (Contract No. 030/RID/2018/19).
The present work investigated the water absorption of thermoplastic matrix composites and their effect on tribolo-
gical behaviour. Four thermoplastic composites were researched based on Polyamide 6 and Polyamide 66 matrix
reinforced with glass fibres. The composites fabricated using the injection moulding technique were immersed in
distilled water at room temperature for a water absorption test for 14 days. Dry sliding wear was conducted using
a ball-on-disc trbiotester. The coefficient of friction (COF) and the wear rate (K) was determined. The sliding trace
was analyzed using a scanning electron microscope (SEM) to reveal the sliding wear mechanism of composites.
Studies have shown that polyamide PA6 based composites are less prone to absorb water than PA66 matrix. In
addition, the composites richer in fibreglass exhibit lower water absorption. Tribological results indicated that
polymer composites showed higher COF and K after water absorption testing. Mean COF and K were in the range
of 0.071÷0.321 and 2.51∙10-6÷1.81∙10-4 mm3N -1 m-1, respectively. Wear traces SEM analysis revealed that untreated
samples are characterized by less intense abrasive and adhesive wear mode than the hydrated polymers. Besides,
the degradation process took place primarily at the polymer matrix-fibreglass interfaces.