Keyword: «ir spectroscopy»

Adhesives with permanent tack are widely used in medicine. Due to its high strength and fast curing, the adhesive provides long-term fixation of medical devices, so it is commonly used for skin fixing of medical devices such as dressings. Currently, among the polymer bases for adhesive systems, polyisobutylene, polysiloxane, urethane and acrylic polymers or mixtures thereof are most often used. However, in this work, the properties of adhesive adhesives of permanent tack for medical purposes based on natural rubber were studied. As fillers used: apple pectin, pine rosin and beeswax. In this work, the determination of the strength during delamination was carried out, microphotographs of a sample of a permanent adhesive adhesive and its components were taken using a scanning electron microscope on a scale of: 150; 500; 1000; 3000; 5000, IR spectroscopy was also performed.

After heat treatment, the ratio of hydroxyl and carboxyl groups, according to IR spectra, both in samples of natural nanodiamonds and in nanodiamonds obtained by detonation synthesis, decreases. An increase in the amount of carboxyl groups on the surface of nanodiamonds after heat treatment in air indicates the oxidation of functional groups under experimental conditions. In the IR spectra of nanodiamonds after heat treatment, the bands in the absorption region of the diamond lattice become more distinguishable, which is explained by the partial purification of the diamond crystalline core from the graphite-like shell. In the IR spectra of natural nanodiamonds after heat treatment, bands appear in the absorption region of nitrogen defects of types A and B, which makes it possible to attribute the sample under study to type I-AB.

This study presents the results of investigating the effect of moisture on the dielectric properties of epoxy materials. Measurements were carried out using gravimetric and dielcometric methods with an LCR meter at 12 kHz. A strong correlation was established between changes in dielectric permittivity and moisture content, confirming the applicability of the method for quantitative in situ moisture monitoring. Additionally, FTIR spectroscopy revealed signs of hydrolytic modification and plasticization of the epoxy network. The dielcometric method demonstrated high sensitivity to structural variations and proved to be a promising tool for diagnosing critical polymer components under operating conditions.