scholarly journals Synthesis of Novel Heterocyclic Imine Type UV Absorbers for Application on Cotton Based Textile Materials

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
Nuket Ocal ◽  
Acelya Aker ◽  
Hikmet Nil Ergindemir ◽  
Agamirze Hamitbeyli
Keyword(s):  
Schiff Bases ◽  
Uv Protection ◽  
Biologically Active ◽  
Uv Absorption ◽  
Protection Factor ◽  
Absorption Properties ◽  
Textile Materials ◽  
Uv Absorbers

Novel Schiff bases with the potential to exhibit biologically active and UV absorption properties were synthesized. Their application on cotton based textile materials was performed and the UV protection factor (UPF) values and the antibacterial features of the treated fabrics were measured.

scholarly journals DESIGN OF TEXTILE UV-SHIELDS BY VAT DYES MODIFICATION

2019 ◽  
Vol 2019 ◽  
pp. 59-62
Author(s):  
Viktoriia VLASENKO ◽  
Svitlana ARABULI ◽  
Valentyna KUCHERENKO ◽  
Arsenii ARABULI ◽  
Petro SMERTENKO ◽  
...  
Keyword(s):  
Uv Radiation ◽  
Protective Factor ◽  
Effective Means ◽  
Uv Protection ◽  
Negative Effects ◽  
Vat Dyes ◽  
Textile Materials ◽  
Pressure Discharge ◽  
Uv Absorbers ◽  
Woven Structures

The problem of human being protecting against UV radiation is becoming more and more significant from year to year and requires urgent solutions. Just UVB causes 50-90% of skin cancer and especially affects children, adolescents and older people. Textile screens are the simplest and most effective means to protect against the negative effects of UV radiation (UVR). Usually, white cotton and linen fabrics are used for summer clothes. However, these materials have a low ultraviolet protective factor (UPF ~ 5). Known developments that relate to the modification of textile materials to protect against UV radiation, suggest the use of dense woven structures; modification with some metals oxides; the use of UV absorbers that are derivats of harmful chemicals (for example, o-hydroxybenzophenones). But these methods do not always provide the sufficiently level of UV protection. In our paper, the effectiveness of vat dyes using to create textile screens for UV protection was investigated. In this study was investigated cotton fabrics dyed with some vat dyes: turquoise, blue, yellow. UVR transmittance studies were performed on optical spectrometer Solar SL40-2 (PSI-Line software). A high pressure discharge lamp DRT-125 was used. As studies have shown, the most effective is a cotton textile screen, dyed with vat blue.

Utilization of Longan Leaf Extract for Dyeing and UV Protection of Silk Fabric Using Pre-Mordanting Method

2014 ◽  
Vol 1030-1032 ◽  
pp. 438-441
Author(s):  
Rattanaphol Mongkholrattanasit ◽  
Charoon Klaichoi ◽  
Kongkiat Maha-In ◽  
Kittisak Ariyakuare ◽  
Sakorn Chonsakorn ◽  
...  
Keyword(s):  
Leaf Extract ◽  
Uv Protection ◽  
Natural Dye ◽  
Uv Absorption ◽  
Silk Fabric ◽  
Protection Factor ◽  
Dyeing Process ◽  
Metallic Salt ◽  
Potential Applications ◽  
Silk Fabrics

Natural dye extracted from the longan leaves was applied to a silk fabric by an exhaustion dyeing process. The dyeing was conducted with and without metallic salt mordants using pre-mordanting. It was observed that with an increase in the dye concentration, the ultraviolet (UV) protection factor (UPF) values ranged between good and very good for the silk fabric. In addition, a darker color, such as that provided by a CuSO4 and FeSO4 mordant, gave better protection because of higher UV absorption. The results confirmed that natural dyes from longan leaf extract with metal mordants have potential applications in fabric dyeing and in producing UV-protective silk fabrics.

scholarly journals ДОСЛІДЖЕННЯ ЕКРАНУЮЧИХ ВЛАСТИВОСТЕЙ ТЕКСТИЛЬНИХ МАТЕРІАЛІВ ЩОДО ДІЇ УЛЬТРАФІОЛЕТОВОГО ВИПРОМІНЮВАННЯ

2021 ◽  
Vol 152 (6) ◽  
pp. 19-28
Author(s):  
С. І. Арабулі ◽  
А. Т. Арабулі ◽  
В. С. Труба ◽  
Д. Р. Левицька
Keyword(s):  
Ultraviolet Radiation ◽  
Uv Radiation ◽  
Human Exposure ◽  
Structural Characteristics ◽  
Effective Means ◽  
Uv Protection ◽  
Aesthetic Perception ◽  
Protection Factor ◽  
Textile Materials ◽  
Shielding Properties

Study the possibility of using textile materials for shielding against the negative effects of ultraviolet radiation. Methodology. Theoretical and experimental researchs are based on the basic principles of textile materials science. The UV shielding ability of textiles was assessed by the UV protection factor (UPF). The UV  protection  factor  was  evaluated  on  a  UV-Vis  spectrophotometer  (Cary  50,  Varian,  Australia)  in accordance with AS / NZ 4399: 1996 in the wavelength range 280-400 nm. According to AS / NZ 4399: 1996, textiles are classified according to the value of the UV protection factor (UPF) as those that provide "excellent UV protection", "very good UV protection", "good UV protection", "does not protect against UV radiation." Results. The main sources of UV radiation are analyzed and the features of the conditions of human exposure when working indoors and outside are considered. It has been established that the degree of human exposure depends on the intensity of UV radiation, and can be reduced by using protective equipment. Flexible textile screens can be one of the effective means of protection against UV radiation. The advantages of textile screens are the possibility of their modification and the ability to create shielding products of various shapes. The level of protective properties of textile screens depends on many factors, namely: the chemical nature of the polymer of textile materials, structural characteristics, modification by certain substances, color, moisture, etc. The results of the study of the coefficient of protection against ultraviolet radiation of textile materials, depending on their color are presented. Scientific novelty. It is proved that the optical properties are not only important for the evaluation of appearance of the textile and garment aesthetic perception, they can control the shielding properties of the textile  to  the  action  of  UV  radiation.  It  was  found  that  dark  saturated  colors  of  textile  fabrics,  all  other conditions being equal, provide shielding properties at the level of "very good protection" compared to light unsaturated colors (the UPF level varies from 10 to 35 with increasing color saturation). Practical value. The possibility of using textile materials for UV protection has been confirmed.

scholarly journals Synthesis and Evaluation of Schiff Bases of 4-Amino-5-(chlorine substituted phenyl)-4H-1,2,4-triazole-3-thione as Antimicrobial Agents

2020 ◽  
Vol 41 (1) ◽  
pp. 26-35
Author(s):  
Kishor Devkota ◽  
Govinda Pathak ◽  
Bhushan Shakya
Keyword(s):  
Schiff Base ◽  
Schiff Bases ◽  
Antimicrobial Agents ◽  
Triazole Ring ◽  
Antimicrobial Activities ◽  
Biologically Active ◽  
Spectral Techniques ◽  
Schiff Base Derivatives ◽  
Bacteria And Fungi ◽  
Different Strains

Triazole ring system has attracted a continuously growing interest of synthetic organic chemists and those dealing with the medicinal compounds due to its versatile potential to interact with biological systems. Schiff bases are also considered as one of the most biologically active compounds.  The aim of the present study was to synthesize new Schiff bases bearing triazole nucleus and to assess their antimicrobial activities. Four new Schiff base derivatives of 1,2,4-triazole-3-thione were synthesized by combining two different pharmacophores viz. triazole nucleus and Schiff base moiety and were characterized by spectral techniques (UV, FT-IR, and NMR). The Schiff bases were evaluated for antibacterial (Staphylococcus aureus, Escherichia coli, and Klebsiella pneumoniae) and antifungal (Candida albicans) activities. The synthesized compounds exhibited good to moderate activities against different strains of bacteria and fungi tested.

Laccase-catalyzed enzymatic dyeing of cotton fabrics

2021 ◽  
pp. 004051752110069
Author(s):  
Rıza Atav ◽  
Bürhan Buğdaycı ◽  
Ömer Bozkurt ◽  
Aylin Yıldız ◽  
Elçin Güneş ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Uv Protection ◽  
Infrared Analysis ◽  
Synthetic Dyes ◽  
Protection Factor ◽  
Knitted Fabrics ◽  
Reactive Dyeing ◽  
Dyeing Process ◽  
Laccase Enzyme ◽  
Color Reproducibility

As some synthetic dyes are regarded to be toxic, mutagenic and carcinogenic, the search for eco-friendly alternatives for the synthesis of dyes and coloration has gained importance. For this reason, this study focused on finding new eco-friendly alternatives for coloring cotton. 100% cotton knitted fabrics were subjected to enzymatic coloration using a commercial laccase enzyme and various precursors. After determining the colors, the effect of pH on the enzymatic dyeing process was investigated. Then the optimization of reaction conditions was also realized statistically for the precursors giving the best results in terms of color. With the aim of obtaining further improvements in color-yield values obtained in enzymatic dyeings, the effect of the pretreatment process and the use of ultrasound were also investigated. Furthermore, the reaction pathways in enzymatic coloration were explained and results were confirmed by means of Fourier Transformed Infrared analysis. As a result of experimental studies, red and lilac colors could be successfully obtained on cotton for the first time in the literature. In this way, the theoretical basis of enzymatic dye synthesis and dyeing of cotton was clarified comprehensively. Furthermore, technical (color reproducibility; washing, rubbing, light and perspiration-fastness values; and UV protection factor), economical (chemical, energy and water consumption required for dyeing (including aftertreatments) of 1 kg fabric) and ecological aspects of enzymatic dyeings were compared with reactive dyeing. According to the experimental results it was found that biological treatment alone was enough for wastewater of enzymatic coloring, while chemical treatment will also be needed in reactive dyeing wastewater. Furthermore, color reproducibility, evenness and UV protection properties of dyed samples were comparable with that of reactive dyeings. However, in terms of the fastness levels achieved, the enzymatic coloring was far behind the reactive dyeing.

Facile fabrication of polyvinyl alcohol-based hydrophobic, fluorescent film via Hantzsch reaction for broadband UV protection

2021 ◽  
Author(s):  
Hongchen Liu ◽  
Hongying Yang ◽  
Kunkun Zhu ◽  
Fang Peng ◽  
Lei Guo ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Chemical Modification ◽  
Human Health ◽  
Uv Light ◽  
Uv Protection ◽  
Hantzsch Reaction ◽  
Uv Absorbers ◽  
Traditional Preparation ◽  
Facile Fabrication

Excessive exposure to ultraviolet (UV) light is harmful to human health. However, the traditional preparation of anti-UV films through doping UV absorbers is unstable. Chemical modification of polyvinyl alcohol (PVA)...

scholarly journals Structure of Schiff Bases Derived from Heptane-2,4,6-trione and Diamines as Obtained from UV Absorption and Circular Dichroism Spectra.

1982 ◽  
Vol 36a ◽  
pp. 167-171 ◽  
Author(s):  
Hans Peter Jensen ◽  
Harald Møllendal ◽  
Inge Mæland ◽  
Øyvind Vorren ◽  
Otto Bastiansen ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Schiff Bases ◽  
Uv Absorption ◽  
Circular Dichroism Spectra ◽  
Circular Dichroïsm
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