scholarly journals INNOVATIVE UV BARRIER MATERIALS MADE OF ORGANIC COTTON DYED WITH NATURAL DYESTUFFS

2019 ◽  
Vol 2019 ◽  
pp. 96-99
Author(s):  
Jadwiga SÓJKA- LEDAKOWICZ ◽  
Joanna LEWARTOWSKA ◽  
Bogumił GAJDZICKI ◽  
Joanna OLCZYK ◽  
Anetta WALAWSKA
Keyword(s):  
Uv Radiation ◽  
Antimicrobial Properties ◽  
Barrier Properties ◽  
Protection Factor ◽  
Ultraviolet Protection Factor ◽  
Barrier Materials ◽  
Organic Cotton ◽  
Natural Dyestuffs ◽  
Uv Transmittance ◽  
Harmful Effects

The paper presents the results of research works on ecological materials that protect humans against the harmful effects of ultraviolet (UV) radiation, made of organic cotton, obtained through the application of selected natural dyes and a new reactive UV absorber with high molar absorption. These materials are intended for clothing, in particular for children and people with photosensitive skin. Instrumental evaluation of obtained colours and barrier properties of textile products for UV radiation were performed, expressed in the UPF (Ultraviolet Protection Factor) value, determined on the basis of measurements of UV transmittance by a textile product. Due to the application area of the new materials, the colour fastness to washing, perspiration, friction and artificial light. For selected newly developed organic cotton products containing in their structure a natural dye and a new UV organic absorber, specialized irritation tests according to OECD were carried out. In addition, the results of studies on antimicrobial properties are presented on the basis of the assessment of antibacterial activity against Gram (+) Staphylococcus aureus and Gram (-) Escherichiacoli.

scholarly journals Antimicrobial Activity and Barrier Properties against UV Radiation of Alkaline and Enzymatically Treated Linen Woven Fabrics Coated with Inorganic Hybrid Material

Molecules ◽  
2020 ◽  
Vol 25 (23) ◽  
pp. 5701
Author(s):  
Joanna Olczyk ◽  
Jadwiga Sójka-Ledakowicz ◽  
Anetta Walawska ◽  
Anna Antecka ◽  
Katarzyna Siwińska-Ciesielczyk ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Uv Radiation ◽  
New Technologies ◽  
Barrier Properties ◽  
Dip Coating ◽  
Sem Analysis ◽  
Woven Fabrics ◽  
Protection Factor ◽  
Ultraviolet Protection Factor ◽  
Harmful Effects

One of the directions of development in the textiles industry is the search for new technologies for producing modern multifunctional products. New solutions are sought to obtain materials that will protect humans against the harmful effects of the environment, including such factors as the activity of microorganisms and UV radiation. Products made of natural cellulose fibers are often used. In the case of this type of material, it is very important to perform appropriate pretreatment before subsequent technological processes. This treatment has the aim of removing impurities from the surface of the fibers, which results in the improvement of sorption properties and adhesion, leading directly to the better penetration of dyes and chemical modifiers into the structure of the materials. In this work, linen fabrics were subjected to a new, innovative treatment being a combination of bio-pretreatment using laccase from Cerrena unicolor and modification with CuO-SiO2 hybrid oxide microparticles by a dip-coating method. To compare the effect of alkaline or enzymatic pretreatment on the microstructure of the linen woven fabrics, SEM analysis was performed. The new textile products obtained after this combined process exhibit very good antimicrobial activity against Candida albicans, significant antibacterial activity against the Gram-negative Escherichia coli and the Gram-positive Staphylococcus aureus, as well as very good UV protection properties (ultraviolet protection factor (UPF) > 40). These innovative materials can be used especially for clothing or outdoor textiles for which resistance to microorganisms is required, as well as to protect people who are exposed to long-term, harmful effects of UV radiation.

scholarly journals The Eco-Modification of Textiles using Enzymatic Pretreatment and New Organic UV Absorbers

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Joanna Olczyk ◽  
Jadwiga Sójka-Ledakowicz ◽  
Marcin Kudzin ◽  
Anna Antecka
Keyword(s):  
Uv Radiation ◽  
Barrier Properties ◽  
Cellulose Fibers ◽  
Woven Fabrics ◽  
Protection Factor ◽  
Enzymatic Pretreatment ◽  
Ultraviolet Protection Factor ◽  
Barrier Materials ◽  
Natural Cellulose ◽  
Triazine Derivatives

AbstractTextile fabrics were subjected to bio-pretreatment using high-activity laccase from Cerrena unicolor for comparison to standard alkaline scouring and organic absorber of ultraviolet (UV) radiation based on 1,3,5-triazine derivatives. The basic aim of the study was the development of textiles made of natural cellulose fibers (mainly flax or its blends with cotton) to provide barrier properties against UV radiation. Controlled application of enzymatic pretreatment of woven fabrics made of natural cellulose fibers allows for an efficient removal of impurities from these fibers, resulting in the improvement of sorptive properties and good penetration of dyeing agents, UV organic absorbers and other chemical modifiers, into the textile structure. In this way, products with UV-protection properties (ultraviolet protection factor >40) are obtained. These innovative barrier materials can be used for outdoor textiles that protect professional people from harmful effects of UV radiation.

scholarly journals Chitin- and cellulose-based sustainable barrier materials: a review

2020 ◽  
Vol 3 (6) ◽  
pp. 919-936
Author(s):  
Zeyang Yu ◽  
Yue Ji ◽  
Violette Bourg ◽  
Mustafa Bilgen ◽  
J. Carson Meredith
Keyword(s):  
Mechanical Properties ◽  
High Surface ◽  
Multilayer Coating ◽  
High Surface Area ◽  
Antimicrobial Properties ◽  
Barrier Properties ◽  
Biological Properties ◽  
Packaging Materials ◽  
Barrier Materials ◽  
Biobased Materials

AbstractThe accumulation of synthetic plastics used in packaging applications in landfills and the environment is a serious problem. This challenge is driving research efforts to develop biodegradable, compostable, or recyclable barrier materials derived from renewable sources. Cellulose, chitin/chitosan, and their combinations are versatile biobased packaging materials because of their diverse biological properties (biocompatibility, biodegradability, antimicrobial properties, antioxidant activity, non-toxicity, and less immunogenic compared to protein), superior physical properties (high surface area, good barrier properties, and mechanical properties), and they can be assembled into different forms and shapes (powders, fibers, films, beads, sponges, gels, and solutions). They can be either assembled into packaging films or used as fillers to improve the properties of other biobased polymers. Methods such as preparation of composites, multilayer coating, and alignment control are used to further improve their barrier, mechanical properties, and ameliorate their moisture sensitivity. With the growing application of cellulose and chitin-based packaging materials, their biodegradability and recyclability are also discussed in this review paper. The future trends of these biobased materials in packaging applications and the possibility of gradually replacing petroleum-based plastics are analyzed in the “Conclusions” section.

Studies on Nano – UV Protective Finish on Apparel Fabrics for Health Protection

2011 ◽  
Vol 15 (3) ◽  
pp. 11-20 ◽  
Author(s):  
Dr. Hireni Mankodi ◽  
Dr. Bipin Agarwal
Keyword(s):  
Skin Cancer ◽  
Protective Clothing ◽  
Cell Function ◽  
Sun Exposure ◽  
Uv Protection ◽  
Protection Factor ◽  
Ultraviolet Protection Factor ◽  
Ultraviolet Protection ◽  
Harmful Effects ◽  
Made In

There is a growing demand in the marketplace for textile apparel that offers comfort and protection from the harmful effects of ultraviolet (UV) radiation. The UV rays of the sun when they come into contact with skin lead to all kinds of skin problems. The accumulated effects damage the skin’s DNA and cell function. In addition to skin cancer, excessive sun exposure also causes pre-malignant actinic keratoses, wrinkles, dark and unsightly blotches, leathery skin and prone to destabilizing the immune system. Research has shown that sun (UV) protective clothing is one of the most effective ways to protect against skin cancer. Such fabrics are specifically designed for sun protection by covering a maximum amount of skin and made from a fabric rated for its level of UV protection. Throwing on a sun protective shirt with an ultraviolet protection factor (UPF) of 30+ value is a proactive decision, which can simply help to live a healthier life. Hence, an attempt has been made in this study to visualize the effect of an application of titanium dioxide nano finish onto cotton and its blends with viscose and polyester to provide nano UV protection, without hampering the strength of the substrate.

Synthesis and Application of New Benzotriazole Derivatives as UV Absorbers for Polyester Fabrics

2011 ◽  
Vol 233-235 ◽  
pp. 219-224 ◽  
Author(s):  
Yan Yan Yang ◽  
Hong Qi Li ◽  
Xue Dan He ◽  
Bing Nan Mu ◽  
Yi Jun Chen ◽  
...  
Keyword(s):  
Uv Light ◽  
Protection Factor ◽  
Polyester Fabrics ◽  
Ultraviolet Protection Factor ◽  
Uv Absorbers ◽  
Ultraviolet Protection ◽  
Dyeing Method ◽  
Uv Transmittance ◽  
The Relationship ◽  
Benzotriazole Derivatives

2-(2′-Hydroxyphenyl)-5-amino-2H-benzotriazole was synthesized and subjected to acylamidation to yield three new ultraviolet (UV) absorbers. The largest absorption wavelength and the relationship between the concentration and the maximum absorbance of the UV absorbers were measured in dimethylsulfoxide. Then the four benzotriazole type UV absorbers were dispersed and applied onto polyester fabrics with the high temperature and pressure dyeing method. The stabilizing effect against UV light of the finished fabrics was studied by ultraviolet protection factor (UPF) and UV transmittance measurement.

scholarly journals Impact of Backbone Amide Substitution at the Meta- and Para-Positions on the Gas Barrier Properties of Polyimide

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2097
Author(s):  
Qian Wen ◽  
Ao Tang ◽  
Chengliang Chen ◽  
Yiwu Liu ◽  
Chunguang Xiao ◽  
...  
Keyword(s):  
Transmission Rate ◽  
Barrier Properties ◽  
Polyimide Film ◽  
Flexible Display ◽  
Gas Barrier ◽  
Positron Annihilation Lifetime ◽  
Barrier Materials ◽  
Oxygen Transmission Rate ◽  
Display Technology ◽  
Gas Barrier Properties

This study designed and synthesised a meta-amide-substituted dianiline monomer (m-DABA) as a stereoisomer of DABA, a previously investigated para-amide-substituted dianiline monomer. This new monomer was polymerised with pyromellitic dianhydride (PMDA) to prepare a polyimide film (m-DABPI) in a process similar to that employed in a previous study. The relationship between the substitution positions on the monomer and the gas barrier properties of the polyimide film was investigated via molecular simulation, wide-angle X-ray diffraction (WXRD), and positron annihilation lifetime spectroscopy (PALS) to gain deeper insights into the gas barrier mechanism. The results showed that compared with the para-substituted DABPI, the m-DABPI exhibited better gas barrier properties, with a water vapour transmission rate (WVTR) and an oxygen transmission rate (OTR) as low as 2.8 g·m−2·d−1 and 3.3 cm3·m−2·d−1, respectively. This was because the meta-linked polyimide molecular chains were more tightly packed, leading to a smaller free volume and lower molecular chain mobility. These properties are not conducive to the permeation of small molecules into the film; thus, the gas barrier properties were improved. The findings have significant implications for the structural design of high-barrier materials and could promote the development of flexible display technology.

scholarly journals Development of Advanced Textile Finishes Using Nano-Emulsions from Herbal Extracts for Organic Cotton Fabrics

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 939
Author(s):  
Prabhuraj D. Venkatraman ◽  
Usha Sayed ◽  
Sneha Parte ◽  
Swati Korgaonkar
Keyword(s):  
Antimicrobial Resistance ◽  
Antimicrobial Properties ◽  
Coconut Oil ◽  
Cotton Fabrics ◽  
Batch Processes ◽  
Herbal Extracts ◽  
Organic Cotton ◽  
Global Pandemic ◽  
Nano Emulsion ◽  
Sufficient Strength

The development of textile finishing with improved functional properties has been a growing interest among industry and scientists worldwide. The recent global pandemic also enhanced the awareness amongst many toward improved hygiene and the use of antimicrobial textiles. Generally, natural herbal components are known to possess antimicrobial properties which are green and eco-friendly. This research reports a novel and innovative method of developing and optimising nano-emulsions using two combinations of herbal extracts produced from Moringa oleifera, curry leaf, coconut oil (nano-emulsion 1) and other using Aegle marmelos with curry leaf and coconut oil (nano-emulsion 2). Nano-emulsions were optimised for their pH, thermal stability, and particle size, and percentage add-on. Organic cotton fabrics (20 and 60 gsm) were finished with nano-emulsions using continuous and batch processes and characterised for their surface morphology using scanning electron microscopy, energy dispersive X-ray (EDX) analysis and Fourier transform infrared spectroscopy (FTIR) analysis. The finished fabrics were evaluated for their Whiteness Index, assessed for antimicrobial resistance against Gram-positive (Staphylococcus aureus) and Gram-negative bacteria (Escherichia coli) using AATCC 100 and 147 methods. In addition, fabrics were assessed for their antifungal efficacy (AATCC 30), tensile strength and air permeability. Results suggested that finished organic fabrics with nano-emulsions had antimicrobial resistance, antifungal, wash fastness after 20 washing cycles, and sufficient strength. This novel finishing method suggests that organic cotton fabrics treated with nano-emulsions can be used as a durable antimicrobial textile for healthcare and hygiene textiles.

Simulation of sunscreen performance

2015 ◽  
Vol 87 (9-10) ◽  
pp. 937-951 ◽  
Author(s):  
Bernd Herzog ◽  
Uli Osterwalder
Keyword(s):  
Sun Protection ◽  
Simulation Algorithm ◽  
Uv Filters ◽  
Protection Factor ◽  
Stage Of Development ◽  
Screening Performance ◽  
Convenient Approach ◽  
Solar Uv ◽  
Harmful Effects

AbstractSunscreens are used to protect the human skin against harmful effects of solar UV radiation. The most important quantity characterizing sunscreen performance is the sun protection factor (SPF). At the stage of development of new sun protection formulations quick and inexpensive methods for estimation of the UV screening performance are highly desirable. The most convenient approach towards this goal is given by computational simulations. Models for the calculation of the SPF employ the same algorithm as used with in vitro SPF measurements, but replace the transmittance measurement by the calculation of the overall absorbance of the UV filters in an irregular sunscreen film. The simulations require a database with quantitative UV extinction spectra of the relevant UV filters as well as a mathematical description of the film irregularity. The simulation algorithm implies also the consideration of photodegradation properties of the UV filters in the sunscreen composition. Besides using such simulations for designing new sunscreen formulations, the calculations can also support the understanding of sunscreen performance in general.

scholarly journals Structure and Functions of Cocoons Constructed by Eri Silkworm

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2701
Author(s):  
Bin Zhou ◽  
Huiling Wang
Keyword(s):  
Ultraviolet Rays ◽  
Structure Property ◽  
Buffer Effect ◽  
Protection Factor ◽  
Secondary Fracture ◽  
Ultraviolet Protection Factor ◽  
Air Gaps ◽  
Performance Indexes ◽  
Before And After ◽  
And Function

Eri silkworm cocoons (E cocoons) are natural composite biopolymers formed by continuous twin silk filaments (fibroin) bonded by sericin. As a kind of wild species, E cocoons have characteristics different from those of Bombyx mori cocoons (B cocoons). E cocoons have an obvious multilayer (5–9 layers) structure with an eclosion hole at one end and several air gaps between the layers, which can be classified into three categories—cocoon coat, cocoon layer, and cocoon lining—with varying performance indexes. There is a significant secondary fracture phenomenon during the tensile process, which is attributed to the high modulus of the cocoon lining and its dense structure. Air gaps provide cocoons with distinct multistage moisture transmission processes, which form a good moisture buffer effect. Temperature change inside cocoons is evidently slower than that outside, which indicates that cocoons also have an obvious temperature damping capability. The eclosion hole does not have much effect on heat preservation of E cocoons. The high sericin content of the cocoon coat, as well as the excellent ultraviolet absorption and antimicrobial abilities of sericin, allows E cocoons to effectively prevent ultraviolet rays and microorganisms from invading pupae. The ultraviolet protection factor (UPF) of the E cocoon before and after degumming were found to be 17.8% and 9.7%, respectively, which were higher than those of the B cocoon (15.3% and 4.4%, respectively), indicating that sericin has a great impact on anti-UV performance. In the cocoon structure, the outer layer of the cocoon has 50% higher content than the inner layer, and the E cocoon shows stronger protection ability than the B cocoon. Understanding the relationship between the structure, property, and function of E cocoons will provide bioinspiration and methods for designing new composites.

scholarly journals UV Radiation Induced Cross-Linking of Whey Protein Isolate-Based Films

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Markus Schmid ◽  
Tobias Konrad Prinz ◽  
Kerstin Müller ◽  
Andreas Haas
Keyword(s):  
Whey Protein ◽  
Uv Radiation ◽  
Reference Sample ◽  
Barrier Properties ◽  
Protein Isolate ◽  
Cross Linking ◽  
Protein Films ◽  
Disordered Protein ◽  
Radiation Induced ◽  
The Cross

Casted whey protein films exposed to ultraviolet irradiation were analyzed for their cross-linking properties and mechanical and barrier performance. Expected mechanical and barrier improvements are discussed with regard to quantification of the cross-linking in the UV-treated whey protein films. Swelling tests were used to determine the degree of swelling, degree of cross-linking, and cross-linking density. When the UV radiation dosage was raised, a significant increase of the tensile strength as well as an increase in Young’s modulus was observed. No significant changes in water vapor and oxygen barrier properties between the UV-treated films and an untreated reference sample could be observed. The cross-linking density and the degree of cross-linking significantly increased due to UV radiation. Combined results indicate a disordered protein network in cast films showing locally free volume and therefore only minor mechanical and barrier improvements.

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