Features of Laser Synthesis of Porous PVDF-Based Ceramic-Polymer Composites

The paper examines the key features of the laser sintering method for compressed ceramic-polymer powder materials, enabling the fabrication of composite films with a high filler content and significant open porosity. The laser parameter limits for the formation of composite films for ceramic-polymer composites with different ceramic fractional compositions are determined. It is shown that at a wavelength of 10.6 μm, films with a thickness of 50 to 150 μm can be produced; a wavelength of 1.06 μm allows only thick layers of several hundred micrometers to be formed. During sintering with radiation at a wavelength of 1.06 μm, extrusion of a portion of the ceramic filler onto the pore surface is observed, while at a wavelength of 10.6 μm, this effect is almost absent. The processes of thermal-oxidative degradation of polyvinylidene fluoride under the action of laser radiation are studied. It is found that under nonequilibrium heating conditions, intermolecular and intramolecular dehydrofluorination processes and the decomposition of molecular chains occur simultaneously; the presence of a ceramic filler intensifies these processes.