scholarly journals Selected performance indices for assessment of polypropylene susceptibility to dyeing by pigments of different UV resistance

Polimery ◽  
2021 ◽  
Vol 66 (1) ◽  
pp. 44-51
Author(s):  
Marek Bieliński ◽  
Artur Kościuszko ◽  
Katarzyna Smolińska
Keyword(s):  
Injection Molding ◽  
Uv Radiation ◽  
Radiation Resistance ◽  
Color Change ◽  
Uv Resistance ◽  
Performance Indices ◽  
Polymer Medium

This study presents an assessment of the effects of usage time for polypropylene (PP) experimental samples including those dyed with pigments of different UV resistance. A standard double cavity mold was used to create the samples by injection molding. Selected indices were analyzed in terms of color change (UV resistance of pigments), and UV radiation resistance of a PP polymer medium. The experiment revealed a significant impact of the accepted usage time and the type of dye concentrates on the indices characterizing the sample color change (CIELab) and a change in the structure and state of the PP medium surface.

scholarly journals Enhanced thermal stability, hydrophobicity, UV radiation resistance, and antibacterial properties of wool fabric treated with p-aminobenzenesulphonic acid

RSC Advances ◽  
2020 ◽  
Vol 10 (30) ◽  
pp. 17515-17523
Author(s):  
Mohammad Mahbubul Hassan
Keyword(s):  
Thermal Stability ◽  
Uv Radiation ◽  
Radiation Resistance ◽  
Antibacterial Properties ◽  
Wool Fabric ◽  
Uv Resistance

The treatment with para-aminobenzenesulphonic acid produced a multifunctional wool fabric with enhanced hydrophobicity, thermal stability, UV resistance, and antibacterial properties.

scholarly journals Influence of UV Radiation on the Color Change of the Surface of Steamed Maple Wood with Saturated Water Steam

Polymers ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 217
Author(s):  
Ladislav Dzurenda ◽  
Michal Dudiak ◽  
Eva Výbohová
Keyword(s):  
Uv Radiation ◽  
Color Change ◽  
Color Space ◽  
Color Stability ◽  
Color Difference ◽  
Saturated Steam ◽  
Water Steam ◽  
Saturated Water ◽  
Red Color ◽  
Uv Lamp

The wood of maple (Acer Pseudopatanus L.) was steamed with a saturated steam-air mixture at a temperature of t = 95 °C or saturated steam at t = 115 °C and t = 135 °C, in order to give a pale pink-brown, pale brown, and brown-red color. Subsequently, samples of unsteamed and steamed maple wood were irradiated with a UV lamp in a Xenotest Q-SUN Xe-3-H after drying, in order to test the color stability of steamed maple wood. The color change of the wood surface was evaluated by means of measured values on the coordinates of the color space CIE L* a* b*. The results show that the surface of unsteamed maple wood changes color markedly under the influence of UV radiation than the surface of steamed maple wood. The greater the darkening and browning color of the maple wood by steaming, the smaller the changes in the values at the coordinates L*, a*, b* of the steamed maple wood caused by UV radiation. The positive effect of steaming on UV resistance is evidenced by the decrease in the overall color difference ∆E*. While the value of the total color diffusion of unsteamed maple wood induced by UV radiation is ∆E* = 18.5, for maple wood steamed with a saturated steam-air mixture at temperature t = 95 °C the ∆E* decreases to 12.6, for steamed maple wood with saturated water steam with temperature t = 115 °C the ∆E* decreases to 10.4, and for saturated water steam with temperature t = 135 °C the ∆E* decreases to 7.2. Differential ATR-FTIR spectra declare the effect of UV radiation on unsteamed and steamed maple wood and confirm the higher color stability of steamed maple wood.

scholarly journals Performance of ZnO nanoparticles for fire retardant and UV protection of pine wood

BioResources ◽  
2018 ◽  
Vol 13 (3) ◽  
pp. 6963-6969
Author(s):  
Higor Rogerio Favarim ◽  
Lucas Oliveira Leite
Keyword(s):  
Uv Radiation ◽  
Zno Nanoparticles ◽  
Sol Gel ◽  
Fire Retardant ◽  
Zinc Nitrate ◽  
Uv Resistance ◽  
Pine Wood ◽  
Open Flame ◽  
Fire Retardance ◽  
Uv Lamp

The aim of this paper was to investigate the influence of zinc oxide (ZnO) nanoparticles on the resistance of pine wood to fire and ultraviolet (UV) radiation. The ZnO nanoparticles were prepared from aqueous zinc nitrate via a proteic sol-gel method. Dried samples were impregnated using immersion in an aqueous solution of ZnO nanoparticles in the amount of 1 wt.% wood. Samples were exposed to an open flame to test the fire retardance, and a high-pressure UV lamp was used to test the UV resistance. The results showed an improvement in the fire retardance and UV radiation resistance after the impregnation of ZnO nanoparticles.

Superoxide Dismutase and Media Dependence of Far-UV Radiation Resistance in Thiol-treated Cells

1990 ◽  
Vol 58 (3) ◽  
pp. 449-461 ◽  
Author(s):  
H.G. Claycamp ◽  
M.L. McCormick ◽  
C.M. DeRose ◽  
J.H. Elwell ◽  
L.W. Oberley
Keyword(s):  
Superoxide Dismutase ◽  
Uv Radiation ◽  
Radiation Resistance

scholarly journals Analysis of the Mechanical Properties Change of PA6/MMT Nanocomposite System after Ageing

2017 ◽  
Vol 756 ◽  
pp. 52-59 ◽  
Author(s):  
Ľudmila Dulebová ◽  
František Greškovič ◽  
Janusz W. Sikora ◽  
Volodymyr Krasinskyi
Keyword(s):  
Mechanical Properties ◽  
Injection Molding ◽  
Tensile Test ◽  
Polymer Nanocomposites ◽  
Uv Radiation ◽  
Environmental Degradation ◽  
Impact Resistance ◽  
Charpy Impact ◽  
Cloisite 30B ◽  
Nanocomposite System

The paper deals with the influence of environmental degradation on the change of the mechanical properties of polymer nanocomposites. The tested material was polyamide (PA) filled with nanoclay fillers Cloisite 30B, Cloisite 93A and Cloisite Na + in a volume of 2, 4 and 6 wt%. Test samples were produced by injection molding and were subjected to 540 hours and 1080 hours of UV radiation. The change of mechanical properties of PA6/MMT nanocomposite systems after the ageing in the UV chamber was studied by tensile test and Charpy impact resistance test. Article also compares structure of PA6/MMT nanocomposite.

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