Water-based, heat-assisted preparation of water-repellent cotton fabrics using graft copolymers

Grozea, Claudia M.; Huang, Shuaishuai; Liu, Guojun

doi:10.1039/c5ra27056a

Cited by 22 publications

(17 citation statements)

References 49 publications

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“…To attach EL, we used graft ( g ) copolymers P1‐ g ‐EL consisting of a P1 backbone and EL side‐chains (Scheme c). P1 was used because the randomly distributed methyl methacrylate (MMA) and 2‐hydroxyethyl methacrylate (HEMA) units crosslinked at 170 °C through trans ‐esterification to eliminate methanol and ethylene glycol, yielding a crosslinked coating around the fibers (Scheme b). P1 was prepared by free radical polymerization and consisted, on average, of 63 MMA units and 39 HEMA units.…”

Section: Methodsmentioning

confidence: 99%

Universal Janus Filters for the Rapid Separation of Oil from Emulsions Stabilized by Ionic or Nonionic Surfactants

2017

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Existing Janus filters cannot separate oil from emulsions stabilized by nonionic surfactants. Reported herein are universal Janus filters that separate oil from emulsions stabilized by not only ionic but also nonionic surfactants. To prepare such a filter, poly(dimethyl siloxane) (PDMS) is grafted onto one side of a fabric. The other side is then grafted with a copolymer polysoap bearing pendant oligo(ethylene glycol) monolaurate (EL) chains. Upon contact with an emulsion, the grafted polysoap competes with free surfactants, ionic or nonionic, for adsorption onto the emulsified droplets, drawing them to the surfaces of the fabric fibers, and causes them to coalesce locally. The coalesced oil then migrates to the PDMS‐coated side of the fabric and selectively permeates it. These novel filters possess enhanced versatility and showcase a new application for polysoaps.

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Section: Methodsmentioning

confidence: 99%

Universal Janus Filters for the Rapid Separation of Oil from Emulsions Stabilized by Ionic or Nonionic Surfactants

2017

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“…The HM blocks can undergo heat‐assisted transesterification reactions between the ester groups of the HM blocks and the hydroxyl groups on the cotton fabric, consequently BP1 blocks are firmly anchored on cotton fabrics via covalent bonds. [ 30 ] The functionalized cotton fabric is denoted as BP1@CF. As shown in SEM image (Figure S9, Supporting Information), the surface of the pristine fabrics is smooth.…”

Section: Figurementioning

confidence: 99%

Durable Antibacterial Cotton Fabrics Based on Natural Borneol‐Derived Anti‐MRSA Agents

Yang

Zhan

Huang

et al. 2020

Adv Healthcare Materials

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“…In addition, harmful reagents like ammonia and acids are often used to promote the reactions or enhance the dispersibility of nanoparticles in these waterborne systems, which make these systems not totally green. Moreover, some of the reported waterborne superhydrophobic coatings are only applicable to rough substrates like fabrics …”

Section: Introductionmentioning

confidence: 99%

Waterborne Nonfluorinated Superhydrophobic Coatings with Exceptional Mechanical Durability Based on Natural Nanorods

Zhang

Gao

et al. 2017

Adv Materials Inter

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Thousands of superhydrophobic materials including coatings, 3D porous sponges, and particles have been prepared in the past two decades. [3] Superhydrophobic coatings have wide potential applications in many fields, e.g., self-cleaning surfaces, oil/water separation, anticorrosion, water collection, and directional water transport, etc. [4] However, it is still very challenging to move superhydrophobic coatings toward real-world applications. [5] The practical applications of superhydrophobic coatings are hindered by some issues, such as harmful volatile organic compounds (VOCs) as solvents, fluorinated chemicals, low mechanical durability, complicated methods, and expensive building blocks, etc.Superhydrophobic coatings are in most cases prepared by the combination of rough surface microstructure and materials of low surface energy. [2b] Various chemical and physical methods are frequently used to construct the surface microstructures like micro-/nanopillars, nanocones, microfibers, and nanofilaments, [4a,6] whereas the abundant natural nanomaterials are often ignored. On the other hand, VOCs like alkanes, alcohols, and arenes are frequently used as solvents to dissolve or disperse the materials of low surface energy. The VOCs make it unfavorable or even impossible for large scale production and applications of superhydrophobic coatings because of environmental pollution, safety risks, and high costs. Compared with VOCs, water is a green solvent, but is seldom used as the solvent for preparation of superhydrophobic coatings. This is because materials of low surface energy often cannot dissolve or disperse very well in water. Waterborne superhydrophobic coatings are receiving growing attention recently aiming at practical applications, and there are a few documented waterborne superhydrophobic coatings. [7] Lin and co-workers found that lyophobic nanoparticles, fluorinated alkyl silane, and fluorocarbon surfactant can form a stable dispersion in water, suitable for preparing superamphiphobic coatings. [8] However, most of the reported waterborne superhydrophobic coatings are only partly waterborne, and VOCs are still used in some of the steps. In addition, harmful reagents like ammonia and acids are often used to promote the reactions or enhance the dispersibility of nanoparticles in these Practical applications of superhydrophobic coatings are hindered by some issues, such as harmful chemicals, low mechanical durability, complicated methods, and expensive building blocks, etc. This study reports preparation of waterborne nonfluorinated superhydrophobic coatings with exceptional mechanical durability based on natural nanorods, palygorskite (PAL). A poly urethane (PU) aqueous solution and the homogeneous methyl polysiloxane modified PAL (PAL@MPOS) suspension composed of methyltrimethoxysilane and the PAL nanorods in water are layerbylayer spraycoated onto glass slides for two times with PU as the adhesive layer. The PAL@MPOS suspensions and the superhydrophobic PU/PAL@MPOS coatings are studied using var ious...

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Water-based, heat-assisted preparation of water-repellent cotton fabrics using graft copolymers

Abstract: A simple, practical, environmentally-friendly method to prepare repellent coated cotton fabrics.

Cited by 22 publications

References 49 publications

Universal Janus Filters for the Rapid Separation of Oil from Emulsions Stabilized by Ionic or Nonionic Surfactants

Universal Janus Filters for the Rapid Separation of Oil from Emulsions Stabilized by Ionic or Nonionic Surfactants

Durable Antibacterial Cotton Fabrics Based on Natural Borneol‐Derived Anti‐MRSA Agents

Waterborne Nonfluorinated Superhydrophobic Coatings with Exceptional Mechanical Durability Based on Natural Nanorods

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