The study of the technical properties of membranes high-styrene thermoplastic elastomer
In the prevention of gastric diseases flexible optical fiber harness with camera and lighting after its extraction from the stomach is subjected to disassembly and continuous sterilization. Protection flexible optical fiber tourniquet, disposable and transparent sheath reduces the duration of the disassembly and sterilization. As the material for the shell of the recommended developed by the Voronezh branch of the FSUE "NIISK" high-styrene block copolymers Styrotep-65. The aim of this work was the development of technologies for films, protective shells of TEC and estimation of their technical parameters. As a benchmark comparison was tested extruded film Styrotep-65. The orientation of the macromolecules of the polymer along the sleeve during extraction provided the anisotropy of the properties of the film along and across the sleeves. In the study of properties of solutions of thermoplastic elastomer is established that the increase in solution viscosity provides greater film thickness in a single dunking them in forms. We investigated the effect of the concentration of a solution Styrotep-65 in toluene and the speed of rotation of a spindle of a Brookfield viscometer PV-E on their viscosity. With increasing concentration of the polymer solution with 19,0 to 26.8 % of the mass. the level of viscosity was increased from 104 to 330 MPa·S. In the interval of increasing the rotational speed of the spindle from 2.0 to 10.0 rpm viscosity solutions is not dependent on the concentration increased due to manifestations of thixotropy. A further increase in the speed of rotation of the spindle 10 to 100 rpm did not affect the viscosity of the solutions. This is true for ideal fluids. Film cast on a horizontal surface of the cellophane from a 10 % toluene solution, was characterized by lower strength than extruded, but with a large elongation at break. Determined the impact of the multiplicity of dipping forms in solution and polymer solution concentration, layer thickness and nature of the substrate on the elastic strength properties of the films. Determined the impact of the multiplicity of dipping forms in solution and polymer solution concentration, layer thickness and nature of the substrate on the elastic strength properties of the films. Maximum strength and the highest elongation at rupture of membranes achieved at three times the dunking form in solution Styrotep-65 with a concentration of 19 % of the mass. The increase in the number of dives forms in the solution was reduced scatter of shell thickness. Under higher magnification, the diameter of the fixed forms of the manifestation of the anisotropy of the properties in the longitudinal and transverse cross section of the membranes due to the orientation of the macromolecules of the polymer along the transverse perimeter of the shell. Confirmed that the increase in the shell thickness leads to a decrease of the translucent ability, measured by a gloss FB-2 and Mono-Spectrum SF-56. Noticed a decrease in light transmission when the thicknesses of the membranes more than 0.15 mm. It is shown that with increase of the wavelength of light grew exponentially. The increase in the thickness of the shells Styrotep-65 from 0.14 to 0.19 mm resulted in a slight decrease in light transmission in the visible and infrared wavelength range from 450 to 750 nm. In the method for casting membranes, determined their optimal thickness based on elastic-strength indicators, identified the effect of the anisotropy properties of the membranes in the longitudinal and transverse cross-section.