3D printing can be a promising approach for depositing polymers onto textiles. Printable materials with good mechanical flexibility; can be used for wearable thermoelectric devices that convert body heat energy into electricity. In this research, first, polypropylene filament was produced. The produced polypropylene filament was printed on polypropylene fabric with different parameters of printing speed, the number of layers, layer thickness, deposition angle, and extruder temperature. A peeling test evaluated the adhesion strength of polymer layers printed on polypropylene fabric. The results showed that a single layer printed with the average printing speed (50 mm/min), the highest extruder temperature (194°C), the medium layer thickness (0.3 mm), and the deposition angle Equal to a Zero degree had a higher peeling force. The cross‐sectional morphology of the printed layer on the fabric; was also investigated by Field emission scanning electron microscopy (FE‐SEM). To achieve thermoelectric properties, multi‐walled carbon nanotubes/copper oxide nanoparticles/polypropylene nanocomposite filament were produced and printed on the fabric by a 3D printer using FDM technology. The mechanical properties of the filaments; were investigated, and filaments were characterized by FE‐SEM, X‐ray diffraction, thermogravimetric analysis, and differential scanning calorimeter. Then the electrical conductivity and Seebeck coefficient of nanocomposite filaments and printed layer on the fabric were measured. The electrical conductivity of the masterbatch, the nanocomposite filament, and the printed layer; was 1.667 × 5−10 s/cm, 2.586 × 6−10 s/cm, and 3.42 × 7−10 s/cm, respectively. Also, the Seebeck coefficient of masterbatch, the filament, and the polymer layer printed on the fabric; were 489, 430, and 220 μv/k, respectively.

Phosphorus-containing groups were grafted on organoclay using cold plasma technique, accompanied by polymerization of ethylene glycol methacrylate phosphate monomers. The obtained compound as a new flame retardant (FR) was added to isotactic polypropylene (iPP) to produce pigmented iPP nanocomposite using twin-screw micro extruder. Characterization was carried out for the best dispersion and chemical structure using scanning electron microscope, X-ray diffraction, transmission electron microscopy, and Fourier transform infrared spectroscopy. Flammability and burning behavior of iPP nanocomposite were characterized by limiting oxygen index and mass loos cone calorimeter. Thermal properties were investigated by thermogravimetry and differential thermogravimetry. C

No abstract

Coating pastes need to have very specific rheological properties because of the methods in which they are applied. Composition of the paste can be formulated in such a manner to achieve the desired rheological behaviour. In this research work rheological measurements of paste with nine various plasticizer content using DOP and DOA, and PVC-E with three k-values (69, 70, 75) were studied. The results indicate that pastes are characterized by a non-Newtonian pseudoplastic flow under the studied conditions. The power-law index ( n) values of the pastes show that the flow properties of pastes change to Newtonian flow above 50 phr plasticizer content. It was also found that the consistency index (k) of the pastes were decreased with increasing plasticizer content. Statistical analysis carried out show very good correlation between the studied parameters.

No abstract