Water-oil Repellent Research Articles

Self-healing cellulose nanocrystals/fluorinated polyacrylate with double dynamic interactions of coumarin groups and multiple hydrogen bonds

In this work, self-healing cellulose nanocrystals/fluorinated polyacrylate with dual dynamic networks of photoreversible crosslinking network and high-density hydrogen bonds was prepared by Pickering emulsion polymerization. The main work was to study the effects of 7-(2-methacryloyloxy)-4-methylcoumarin (CMA) and 2-ureido-4[1H]-pyrimidinone methyl methacrylate (UPyMA) monomer dosage on emulsion polymerization and latex film properties. The monomer conversion increased first and then decreased as the CMA and UPyMA monomer dosage increased, while a reverse trend was noted for the particle size and particle size distribution. Incorporating UPyMA allowed the rapid formation of hydrogen bonds at the crosslinking sites, which increased the interaction force between the healing surfaces. Besides, reversible photocrosslinking reaction of coumarin groups provided another support for self-healing performance. Moreover, the influence of self-healing temperature, self-healing time and UV irradiation on the self-healing ability was also systematically investigated The tensile strength of the prepared cellulose nanocrystals/fluorinated polyacrylate latex film exhibited a self-healing efficiency of 91.4 % under 365 nm UV irradiation and 80 °C for 12 h. The latex film had excellent thermal stability as was shown by TG and DTG analyses. The outstanding self-healing capability of latex film was attributed to the reversible photodimerization of coumarin groups and multiple hydrogen bonds. In addition, the water-oil repellent and mechanical properties of the latex films were improved as the CMA and UPyMA monomer dosage increased.

Preparation of light‐responsive block copolymer modified cellulose nanocrystal@polydopamine particle and its application in fluorinated polyacrylate film

AbstractLight‐responsive cellulose nanocrystal@polydopamine (CNC@PDA) modified fluorinated polyacrylate was synthesized by Pickering emulsion polymerization with light‐responsive block copolymer modified CNC@PDA as stabilizer. The epoxy groups in poly(acrylic acid‐co‐acrylamide)‐b‐poly(glycidyl methacrylate)‐b‐poly(hexafluorobutyl acrylate‐co‐coumarin) amphiphilic triblock copolymer reacted with the hydroxyl and amino groups on the surface of CNC@PDA to form the modified CNC@PDA. The successful preparation of modified CNC@PDA was confirmed by means of FT‐IR, XRD, TG, UV–Vis, surface tension measurement, and X‐ray photoelectron spectroscopy (XPS) techniques. The results showed that the modified CNC@PDA had light‐responsive and amphiphilic properties, and could be used as stabilizer to form stable Pickering emulsion. And the influence of modified CNC@PDA dosage on emulsion polymerization and film performance was systematically studied. The latex particle size decreased initially with increasing modified CNC@PDA dosage, from 0.6 to 1.0 wt%, and then increased. The mechanical, self‐healing, and water–oil repellent properties of film were enhanced initially with increasing modified CNC@PDA dosage, from 0.6 to 1.0 wt%, and then declined. Atomic force microscope confirmed that the latex film had a rough surface. Moreover, the latex film comprising 1.0 wt% modified CNC@PDA presented not only high tensile strength (4.92 MPa), large elongation at break (657.70%), and superior oil/water repellency but also excellent self‐healing property.

Thermo-physiological comfort properties of various shirt fabrics treated with conventional and nano sized water-oil repellent and wrinkle resistant agents

The extreme temperatures and humidity are quite disturbing climatic conditions and clothing is the only protective material in these cases. During the interactions of the human body, clothing, and the environment, to maintain thermal equilibrium, thermo physiological comfort is crucially important. In general, the thermo physiological comfort features of a fabric include thermal conductivity, thermal flow, thermal absorbtivity, thermal resistance, thickness, water vapor permeability and air permeability. In this study, 21 different kinds of woven shirt fabrics produced from fibers in various blends have been treated with both classical and nano chemicals in four different concentrations to produce fabrics having different water-oil repellent and wrinkle resistant characteristics. The effects of the fiber type, treatment method, chemical type, and chemical concentration on the thermal, water vapor and air permeability properties of the fabrics treated with various finishing processes were investigated by statistical analysis. The results of thermal related properties, air permeability and water vapor permeability of the fabrics confirmed that using cotton, lyocell, and viscose shirt fabrics treated with transfer method could be advantageous, especially in hot climatic regions.

Synthesis of cellulose nanocrystals-armored fluorinated polyacrylate latexes via Pickering emulsion polymerization and their film properties

Cellulose nanocrystals-armored fluorinated polyacrylate latex particles with the core-shell spherical shape were prepared by a facile and efficient strategy based on Pickering emulsion polymerization using the modified cellulose nanocrystals, poly(2-(dimethylamino) ethyl methacrylate)-g-cellulose nanocrystal-g-poly(2,2,3,4,4,4-hexafluorobutyl acrylate) (PDMAEMA-g-CNC-g-PHFBA) as a sole Pickering stabilizer. The TEM result indicated that PDMAEMA-g-CNC-g-PHFBA effectively anchored on the outside of latex particles and improved the performance of emulsions, demonstrating the important role of the PDMAEMA-g-CNC-g-PHFBA in the Pickering stabilization process. The influences of the type of Pickering stabilizers and the PDMAEMA-g-CNC-g-PHFBA amount on the emulsion polymerization were investigated. The size of latex particles could be adjusted by PDMAEMA-g-CNC-g- PHFBA amount. XPS result showed that the fluorine-containing groups tended to enrich at the air-film interface of latex film during the heat process, leading to the decrease of surface free energy. The water-oil repellent and mechanical properties of the film could be improved as the content of PDMAEMA-g-CNC-g-PHFBA increased. In addition, thermal analysis showed an enhancement of the thermal properties of latex film upon increasing the PDMAEMA-g-CNC-g-PHFBA content.

IMPROVEMENT OF MULTIFUNCTIONAL AUTOMOTIVE TEXTILE

In order to improve multifunctional automotive textile, required functionalities that have been expected by the automotive industry were enhanced in this study. For this aim, flame retardant and water-oil repellent effects were achieved on 100 % polyester based automotive fabrics via pad-dry-cure system with performed finishing recipes. After functionalization of the fabrics, polyurethane based foams were laminated to the treated automotive textiles. In order to be able to compare the results of tests and to determine the effects of used chemicals on the functionalities of fabrics, chemical amounts of recipe were optimized and the results were discussed. Flame retardancy, water repellency and oil repellency tests were performed before and after abrasion tests. Color spectrums of treated fabrics were tested after chemical finishing applications. Morphological analyses of samples were tested by SEM and chemical structures of the fabrics were analyzed by FTIR-ATR. According to performance test results, multifunctional automotive textile including flame retardant and water-oil repellent effect was achieved successfully. During the burning test, it was determined that laminated textile structure was self-extinguished whereas 3M water repellency grades were at the highest value before abrasion tests.

Nanocrystalline cellulose/fluorinated polyacrylate latex via RAFT‐mediated surfactant‐free emulsion polymerization and its application as waterborne textile finishing agent

ABSTRACTA simple method for nanocrystalline cellulose (NCC)/fluorinated polyacrylate was developed by RAFT‐mediated surfactant‐free emulsion polymerization, in which the nanocomposites formed a core‐shell spherical morphology. The influence of the content of NCC‐g‐(PAA‐b‐PHFBA) (AA was acrylic acid, HFBA was hexafluorobutyl acrylate) on the properties of latex and film were systematically studied. The monomer conversion, the tensile strength, and water–oil repellency of film increased first and then decreased, the latex particle size decreased first and then decreased, when the content of NCC‐g‐(PAA‐b‐PHFBA) increased from 1 to 6 wt %. Elongation at break and thermal stability distinctly decreased when the content of NCC‐g‐(PAA‐b‐PHFBA) gradually increased. XPS showed that the fluorine‐containing groups well concentrated at the film–air interfaces during the annealing process. SEM analysis revealed that the treated fiber had a rugged surface, and the treated fabric had an excellent water repellency. In addition, this green grafting method in water offered a new perspective for the fabrication of exceptional NCC‐based nanocomposites with NCC as the core and also helped to promote the potential applicability of NCC in a range of multipurpose applications. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019 © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 1305–1314

Photopolymerization of maleimide perfluoropolyalkylethers without a photoinitiator

ABSTRACTPerfluoropolyalkylethers derived from hexafluoropropylene oxide were functionalized with maleimide groups. Irradiated by UV‐light, the new maleimide macromonomers demonstrated very fast polymerization kinetics with a curing time as fast as 8 s. The effect on photopolymerization of different features such as the molecular weight of the fluorinated chain and the chain length of the hydrogenated spacer were studied, as well as the influence of the type of photoinitiator and the presence of air. Thermal and surface properties of the UV‐cured polymers were examined and were typical to fluoropolymers in view of water–oil repellent coatings. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 699–707

Synthesis of Poly(methyl methacrylate-co-butyl acrylate)/Perfluorosilyl Methacrylate Core-Shell Nanoparticles: Novel Approach for Optimization of Coating Process.

In this study, the coating order of two monomers in the shell polymerization process of core-shell nanoparticles was altered to facilitate easy coating and optimize the properties of the coated surface to simplify the additional coating formulation process. To obtain a glass transition temperature suitable for coating, a core was synthesized by the copolymerization of an acryl monomer. A perfluoro monomer and silane monomer were additionally added to synthesize nanoparticles exhibiting both water–oil repellency and anchoring properties. In order to realize various surface properties, the nanoparticles underwent surface modification and cellulose fiber was introduced. Through the various data described in this text, the surface properties improved with the order of the introduction of the two monomers.

Investigating the effect of Water-oil repellency finish on baby clothes

In this paper, fuzzy logic method was used to model the effect of stain repellent treatment on plush knitted fabrics intended for baby clothes. In order to reduce the complexity of the models and increase the knowledge and comprehension of the underlying process, a fuzzy sensitivity variation criterion was used to select the most relevant parameters which are taken as inputs of the reduced fuzzy logic models. The outputs are the water-oil contact angles characterizing the stain repellent behavior of fabrics and the percentage of decrease of air permeability to control the change of hygienic comfort. Obtained results showed that the hydrophilic samples were transformed to water-oil repellent ones and some experimental conditions induce a high contact angle without affecting the air permeability.

Predicting stain repellency characteristics of knitted fabrics using fuzzy modeling and surface response methodology

The effect of a stain repellent treatment on the water-oil repellency characteristics of plush knitted fabrics is investigated. We compared the efficiency of two methods of modeling; a Multicriteria analysis was employed by means of surface response method and an artificial intelligence-based system approach is presented by fuzzy logic modeling in which the effects of the operating parameters and intrinsic features of fabrics are studied. These parameters were pre-selected according to their possible influence on the outputs which were the contact angle and the air permeability. An original fuzzy logic-based method was proposed to select the most relevant parameters. The results show that air permeability was influenced essentially by knitted structure’s parameters but the variation of treatment parameters has a great effect on the contact angle. Thus, it is believed that artificial intelligence system could efficiently be applied to the knit industry to understand, evaluate, and predict water-oil repellency parameters of plush knitted fabrics more than Multicriteria analysis.

Development of water-, oil-repellent and flame-retardant cotton fabrics by organic-inorganic hybrid materials

In this study, water-repellent, oil-repellent and flame-retardant cotton fabrics were developed by solgel technique. With this aim, nanosols were prepared using tetraethylorthosilicate and hexadecyltrimethoxysilane as precursors, guanidine dihydrogen phosphate as flame-retardant agent and Guard AFB as conventional water–oil-repellent agent, solvents and chelating agents. Then, to AC105, VA7110, PU1110 and FC9005 as polymeric additives, with/without FX8000 or urea and formaldehyde as cross-linking agents, were added some nanosols to improve washing fastness of the fabric samples. Cotton fabrics were treated with nanosols without polymeric additives by pad–dry–cure process, while they were coated with nanosols containing polymeric additives by knife-over-roll coating. Water–oil-repellent properties, flame-retardant properties, washing fastness, contact angle, whiteness, tear strength and add-on values of the coated fabric samples were determined. It was found that the cotton fabrics with good water–oil-repellence and flame-retardant properties with relatively durable properties could be produced using nanosols containing guanidine dihydrogen phosphate and urea, together with tetraethylorthosilicate and hexadecyltrimethoxysilane as precursors, and lower concentrations of Guard AFB as commercial water–oil-repellent agent. However, the fabric samples were still not sufficiently durable when washed. It was deduced that the durability of cotton fabric during washing is developed by means of treatment with nanosols containing polyvinyl acetate-based polymer.

Durable press finishing of cotton fabrics: An overview

Durable press (DP) or easy care finishing is almost always used for cotton fabrics or textiles with a high content of cellulosic fibers. This finish provides resistance against shrinkage and improved wet and dry wrinkle recovery to cellulosic textiles. Inhibition of easy movement of the cellulose chains by crosslinking with resins/polymers is the mechanism of a DP finish. Initially, derivatives of urea such as urea-formaldehyde and melamine-formaldehyde resins were used. Environmental concerns and the potential danger of formaldehyde led to the introduction of formaldehyde-free finishes. Among them, polycarboxylic acids such as 1,2,3,4-butanetetracarboxylic acids and citric acids are the most promising chemicals. To enhance the flexibility, tensile strength and whiteness of the easy care finished textiles, novel finishing agents have been recently considered; for example, ionic crosslinking, polyamino carboxylic acids and non-ionic polyurethane, as well as employing nano-materials as the catalyst or co-catalyst. The possible application of the easy care treatment with other functional finishes, mainly antimicrobial, flame retardancy and water–oil repellency, has been also been focused upon.

Prediction of various functional finishing treatments using artificial neural networks

In this study, in order to produce different water-oil repellent and wrinkle resistant fabrics, 21 different kinds of blended woven fabrics were treated (padded and transfered) with both classic and nano chemicals according to 4 different levels of concentrations. Afterwards, water, oil repellency and wrinkle angle recovery properties of the fabrics were measured. The purpose of this study is to predict these aforementioned functional properties of the fabrics before manufacturing based on the fabric blend, treatment method, used chemicals and chemical concentrations with the help of multi layer perceptron, one of the most popular network architecture. As a result of the study, it can be concluded that multi layer perceptron method can also be used for the classification problems successfully.

Fluorinated segmented polyurethane anionomers for water–oil repellent surface treatments of cellulosic substrates

AbstractThree model structures of linear segmented anionomeric polyurethanes based on perfluoropolyether dimethylol‐terminated oligomers, isophorone diisocyanate, and dimethylol propionic acid were synthesized and obtained in the form of aqueous dispersions. The structures differed from each other in the chemical nature of the chain extender (diol or diamine) and in the content of carboxylic acid. Dispersions and polymer films were characterized by dynamic light scattering, dynamic mechanical analysis, differential scanning calorimetry, and contact angle measurements. Diluted aqueous dispersions were also evaluated as protective sizing agents in paper treatment, both as bulk modifiers and as surface treatments. Paper sheets characterized by high water and oil repellence were obtained. The results showed that performance is mainly related to the ionic group content of the polymer and to its molecular architecture. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1364–1372, 2005

Syntheses and Applications of Aromatic Compounds Containing Fluoroalkyl Groups

The methods for the introduction of trifluoromethyl and other fluoroalkyl groups into aro-matic compounds have been described in detail. Furthermore, it has also been demonstrated that the various aromatic compounds containing fluoroalkyl groups are applicable to the water-oil repellent and optical usage.