Nanocomposite films with UV-Protective Properties Based on Polyethylene with Ultra-Disperse Silicon

Abstract

Translated by R. WalkdenPolymer film materials based on polyethylene containing between 0.5% and 1.0% by wt. nanocrystalline silicon (ncSi) with excellent strength properties have been produced. Specimens of ncSi with a mean core diameter of 7-10 nm were synthesised using plasma chemistry methods and laser-induced breakdown of monosilane. Spectral studies indicate an almost total (up to ~95%) absorption of UV radiation by films 85 microns thick in the 200-400 nm area with a 1.0% by wt. ncSi content in them. Using the method of full-profile modelling of X-ray diffraction patterns, and assuming that the crystallites are spherical in shape and have a log-normal distribution, the particle size distribution density functions in the initial powders and polymer films containing immobilised silicon nano-crystallites were derived. X-ray analysis results show that the distribution function for crystallite dimensions remains virtually unaltered with implantation of initial ncSi specimens in a polymer matrix, while the degree of crystallinity of the initial polymer increases (~10%).

Structure and properties of ultrathin poly-(3-hydroxybutirate) fibers modified by silicon and titanium dioxide particles

“…Research and development are actively taking place in the areas of synthesis, characterization, and analysis of nanosilicon, silicon carbide, and titanium dioxide, as well as synthesis and characterization of the physicochemical properties of hybrid photoactive silicon based structures, including organic and inor ganic emulsion materials, hydrogels, and UV protec tive and photoluminescent polymeric materials [15,20,[28][29][30]. The importance of this research is proven by the practical significance of the anticpated results.…”