Funct. Mater. 2025; 32 (4): 578-585.
Investigation of properties and structure of polymer coatings based on epoxy polymer and trimethoprim
1Kherson State Maritime Academy, 20 Ushakov Ave., Kherson, 73009, Ukraine
2E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine, 11 Kazymyr Malevich St., Kyiv, 03150, Ukraine
The properties and structure of composites based on epoxy polymer and the synthetic antibiotic trimethoprim were investigated. It was found that the dispersed filler trimethoprim C14H18N4O3 exhibited an amorphous structure in the volume of the epoxy polymer, partially post-curing the polymer matrix. The introduction of trimethoprim into the epoxy matrix at a content of q = 10-15 wt.%. makes it possible to obtain new polymeric materials with improved mechanical properties, in particular: the flexural elastic modulus increases from E = 2.90 GPa to E = 3.67 GPa; the impact strength increases from W = 7.0 kJ/m2 to W = 12.8 kJ/m2; the flexural strength increases from σb = 48.0 MPa to σb = 87.7 MPa compared to the original epoxy composite. The change in the morphology of the epoxy polymer upon the introduction of an active filler was studied by optical microscopy. Based on the analysis of infrared spectra in the wavenumber range ν = 900-4000 cm-1, structural changes in the studied materials were determined, indicating the chemical interaction of the antibiotic with the epoxy polymer. X-ray diffraction analysis showed that the initial dispersed filler trimethoprim has a crystalline structure, and the epoxy polymer filled with trimethoprim has an amorphous structure. This may indicate the dissolution of the filler in the volume of the epoxy polymer.
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