Comparative Study of Properties of New Packing Materials Based on Polyvinyl Chloride with Various Additives

2020 ◽  
Vol 24 (6) ◽  
pp. 30-35
Author(s):  
V.S. Sibirtsev ◽  
K.V. Danilova ◽  
M.V. Uspenskaya ◽  
A.Yu. Ivanov ◽  
S.M. Shishlyannikov ◽  
...  
Keyword(s):  
Polyvinyl Chloride ◽  
Lactobacillus Acidophilus ◽  
Polymer Materials ◽  
Vital Activity ◽  
Elastic Light Scattering ◽  
Scattering Intensity ◽  
New Methods ◽  
Light Scattering Intensity ◽  
Before And After ◽  
Medium Resistance

New methods is described for assessing the resistance of packaging and other materials to destruction caused by the action of various factors (such as mechanical stress, moisture, and the vital activity of microorganisms etc.). This method include comparing the strength of samples of the studied materials (SSM), determined before and after 9-day incubation of SSM in liquid nutrient medium (NM) with and without test microorganisms (TM) by day-to-day replacement of 40 vol. % NM on steril medium. Resistance to various types of degradation of a number of new polymer materials based on polyvinyl chloride (PVC) with the addition of 0 to 30 mass. % starch, pectin, polyhydroxybutyrate and bentonite was investigated by the method described. The effect of SSM on the growth and metabolic activity in liquid NM of Lactobacillus acidophilus was also studied (according to the dynamics of changes in the elastic light scattering intensity, pH, and electrical conductivity of NM during the first 9 hours of its incubation in the presence of SSM and TM). As a result, it was shown that if it is necessary to increase the overall degradability of such materials (including biodegradability), it is better to use from 5 to 10 mass. % starch as additives to their PVC base. If it is necessary to increase the biodegradability of such materials, it is better to use from 5 to 10 mass. % polyhydroxybutyrate as additives to their PVC base. Аnd if it is necessary to increase the biostability of constructed PVC-materials, it is better to use from 5 to 15 mass .% bentonite as additives to their PVC base.

Light Scattering Intensity Fluctuations in Microdroplets Containing Inclusions.

1997 ◽  
Author(s):  
Gorden Videen ◽  
Paul Pellegrino ◽  
Dat Ngo ◽  
John S. Videen ◽  
Ronald G. Pinnick
Keyword(s):  
Light Scattering ◽  
Scattering Intensity ◽  
Light Scattering Intensity ◽  
Intensity Fluctuations

scholarly journals Effect of Temperature on the Tribological Properties of Selected Thermoplastic Materials Cooperating with Aluminium Alloy

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7318
Author(s):  
Anita Ptak ◽  
Paula Taciak ◽  
Wojciech Wieleba
Keyword(s):  
Aluminium Alloy ◽  
Contact Pressure ◽  
Tribological Properties ◽  
Polymer Materials ◽  
Effect Of Temperature ◽  
Test Results ◽  
Friction Process ◽  
Before And After ◽  
Pin On Disc ◽  
Two Parameters

This article concerns the tribological properties of three selected polymer materials: polyamide PA6, polyethylene PE-HD and polyetheretherketone composite PEEK/BG during sliding against aluminium alloy EN AW-2017A in the presence of hydraulic oil HLP 68. The tests were carried out under contact pressure p of 3.5–11 MPa at ambient temperature T ranging from −20 °C to +20 °C. The dependence of kinetic friction coefficient μk on the two parameters was determined through tribological tests carried out using a pin-on-disc tribometer. A five-level central composite rotatable design (CCRD) was adopted for the experiment. All the test results were statistically analysed. The microhardness of the surface of the polymeric material was measured before and after the friction process. The surface was also examined under SEM. Temperature and contact pressure have been found to have a significant effect on the tribological properties of the tested sliding pairs. Relative to the applied friction conditions, the surfaces after friction showed rather heavy signs of wear.

Some Effects on Light Scattering Intensity and Red Blood Cell Size Distribution Histograms Due to Sphering

1988 ◽  
Vol 25 (6) ◽  
pp. 673-679 ◽  
Author(s):  
P C Bartels ◽  
P W Helleman ◽  
A F M Roijers ◽  
J B J Soons
Keyword(s):  
Light Scattering ◽  
Blood Cell ◽  
Size Distribution ◽  
Red Blood Cell ◽  
Signal To Noise Ratio ◽  
Quantitative Information ◽  
Cell Size Distribution ◽  
Scattering Intensity ◽  
Distribution Ranges ◽  
Light Scattering Intensity

At present most haematology blood cell analysers routinely provide red blood cell (RBC) size distribution histograms. Sophisticated improvements of the instruments have re-awakened interest in the study of size histograms. The quantitative information derived from the histograms may be applied more fruitfully if insight is available, with respect to some essential principles of sizing technology and methods for treatment of RBCs before measurement. In this study the consequences of sphering RBCs are investigated in relation to the generation of size distribution histograms by means of methods based on light scattering intensity (LSI). Sphering of RBCs results in considerably narrower histograms than unsphered RBCs. The overall signal to noise ratio increases and there is a broader gap between large platelets and microcytic RBCs. Narrower size distribution ranges will enable closer modes to be separated. Compared to unsphered RBCs, microcytic sphered RBCs yield increased LSI whereas macrocytic sphered RBCs yield decreased LSI.

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