Study of the influence of the technological mode of ultrasonic pressing with low-frequency modulation on the sructure of polytetrafluoroethylene modified with boron nintiride

Subject of research: the work presents a study of the influence of the technological mode of pressing a polymer composite material (PCM) using ultrasonic influence with a frequency of f = 17 kHz and low-frequency modulation with a frequency of f = 100 Hz on the processes of formation of the structure of polytetrafluoroethylene with hexagonal boron nitride 5 wt. %. Purpose of research: to study the influence of the technological mode of ultrasonic pressing with low-frequency modulation on the structural parameters of a polymer composite material. Object of research: is a synthesized polymer composite material based on polytetrafluoroethylene of the PN-20 trademark, with a density of 2.16 g/cm3 and a particle size of 20 microns, a filler of graphite-like hexagonal boron nitride containing 5 wt. %. Methods of research: the research methodology consisted of comparing three technological modes for manufacturing samples of a polymer composite material in order to identify patterns of influence on the parameters of the supramolecular structure. The first mode is the traditional technology of pressing the material (WITHOUT US). The second mode consisted of exposure to ultrasonic vibrations f = 17 kHz without low-frequency modulation (US). The third mode is ultrasonic vibrations of 17 kHz with simultaneously superimposed low-frequency modulation of 100 Hz (US+100). Main results of research: the influence of technological pressing modes on the structure of a polymer composite material based on polytetrafluoroethylene with the addition of hexagonal boron nitride 5 wt. %, it is shown that ultrasonic exposure at a frequency of 17 kHz with low-frequency modulation of 100 Hz leads to improved interaction of filler particles with the polymer matrix and the formation of a more uniform structure.