Synthesis and characterization of waterborne polyurethane emulsions based on poly(butylene itaconate) ester

Xu, Jingkun; Li, Tong; Zhao, Wenpeng; Pan, Li; Wu, Yumin

doi:10.1080/15685551.2016.1152541

Cited by 15 publications

(8 citation statements)

References 26 publications

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“…Figure 15 shows the water swelling values. The swelling values of the films after 48 h are consistent with the increased content of hydrophilic chain extender (DMBA), in agreement with the behavior that was reported by Xu et al for dimethylol propionic acid (DMPA) [35]. Although the DMBA content seems to be the determining factor in the water absorption of the films, the increasing content of Priplast 3294 (hydrophobic polyol soft segment) also has a notable influence in decreasing water swelling, as can be noted in contour plot from Figure 16 (right).…”

Section: Synthesis and Characterization Of Wpudsupporting

confidence: 91%

Biobased Waterborne Polyurethane-Urea/SWCNT Nanocomposites for Hydrophobic and Electrically Conductive Textile Coatings

Lacruz

Salvador²,

Blanco

et al. 2021

Polymers

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Waterborne polyurethane-urea dispersions (WPUD), which are based on 100% bio-based semi-crystalline polyester polyol and isophorone diisocyanate, have been successfully synthesized and doped with single-walled carbon nanotubes (SWCNT) to obtain a finishing agent that provides textiles with multifunctional properties. The chemical structure of WPUD has been characterized by Fourier-transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). The thermal properties have been evaluated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical thermal analysis (DMTA). Mechanical properties have been studied by tensile stress–strain analysis. Moreover, the particle size, particle size distribution (PSD), and stability of developed waterborne dispersions have been assessed by dynamic light scattering (DLS), Z-potential, and accelerated aging tests (analytical centrifugation). Subsequently, selected fabrics have been face-coated by the WPUD using knife coating method and their properties have been assessed by measuring water contact angle (WCA), water column, fabric stiffness, and air permeability. The electrical conductivity of textiles coated with SWCNT-doped WPUD has been evaluated by EN 1149 standard. Finally, the surface morphologies of uncoated and coated fabrics have been studied by scanning electron microscopy (SEM). All of the synthesized polyurethane-ureas provide the coated substrates with remarkable water-repellency and water column, being therefore a more sustainable alternative to waterproof coatings based on fluoropolymers, such as PTFE. The additivation of the polymeric matrices with SWCNT has led to textile coatings with excellent electrical conductivity, maintaining water column properties, giving rise to multifunctional coatings that are highly demanded in protective workwear and technical textiles.

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Section: Synthesis and Characterization Of Wpudsupporting

confidence: 91%

Biobased Waterborne Polyurethane-Urea/SWCNT Nanocomposites for Hydrophobic and Electrically Conductive Textile Coatings

Lacruz

Salvador²,

Blanco

et al. 2021

Polymers

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“…Figure 15 shows the water swelling values. The swelling values of the films after 48 h were consistent with the increased content of hydrophilic chain extender (DMBA), in agreement with the behavior that was reported by Xu et al for waterborne polyurethane emulsions using dimethylol propionic acid (DMPA) as an internal emulsifier [15]. Contour plots from the ternary mixture experimental designs clearly confirm the relationship between DMBA content and water swelling in Figure 16.…”

Section: 13 X For Peer Reviewsupporting

confidence: 89%

Biobased Waterborne Polyurethane-Ureas Modified with POSS-OH for Fluorine-Free Hydrophobic Textile Coatings

Lacruz

Salvador²,

Blanco

et al. 2021

Polymers

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Waterborne polyurethane-urea dispersions (WPUD), which are based on fully biobased amorphous polyester polyol and isophorone diisocyanate (IPDI), have been successfully synthesized obtaining a finishing agent that provides textiles with an enhanced hydrophobicity and water column. Grafting of trans-cyclohexanediol isobutyl POSS (POSS-OH) to the biobased polymer backbone has also been investigated for the first time and its properties compared to a standard chain extender, 1,3-propanediol (PDO). The chemical structure of WPUD has been characterized by Fourier-transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR). The thermal properties have been evaluated by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Mechanical properties have been studied by tensile stress–strain analysis. Moreover, the particle size, particle size distribution (PSD), and stability of developed waterborne dispersions have been assessed by dynamic light scattering (DLS), Z-potential, storage aging tests, and accelerated aging tests by analytical centrifuge (LUM). Subsequently, selected fabrics have been face-coated by the WPUD using the knife coating method and their properties have been assessed by measuring the water contact angle (WCA), oil contact angle (OCA), water column, fabric stiffness, air permeability, and water vapor resistance (breathability). Finally, the surface morphology and elemental composition of uncoated and coated fabrics have been studied by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), respectively. All of the synthesized polyurethane-ureas provided the coated substrates with a remarkable hydrophobicity and water column, resulting in a more sustainable alternative to waterproof coatings based on fluoropolymers, such as PTFE. Grafting POSS-OH to the polymeric backbone has led to textile coatings with enhanced hydrophobicity, maintaining thermal, mechanical, and water column properties, giving rise to multifunctional coatings that are highly demanded in protective workwear and technical textiles.

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“…The characteristic peaks at 3310 and 1529 cm −1 are assigned to the −NH stretching and bending vibrations, respectively, while at 1725 cm −1 rises the −C=O stretching vibration of the urethane bond, and at 2953 and 1234 cm −1 are the aliphatic C−H and −COO− stretching vibrations. 62,63 As confirmed by the wettability study presented in the next paragraphs, the −NH and −COO− polar groups tend to attract each other and form hydrophilic microdomains allowing the water molecules to diffuse readily through them, 64 rendering the foams water-absorbing.…”

Section: ■ Results and Discussionmentioning

confidence: 75%

Expanded Graphite-Polyurethane Foams for Water–Oil Filtration

Vásquez

Campagnolo

Athanassiou

et al. 2019

ACS Appl. Mater. Interfaces

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Herein, expanded graphite is successfully combined with waterborne polyurethane to develop porous foams with underwater oleophobic properties for the separation of surfactant-free, oil-in-water mixtures and emulsions. To obtain foams with different pore sizes and therefore with different performances in the oil−water filtration process, two solvent-free fabrication processes are adopted. In the first one, the expanded graphite granules are mixed with the waterborne polyurethane (PUEGr), and in the second method, calcium carbonate is introduced to the two-component mixture (PUEGr_t). In both cases, the obtained foams exhibit hydrophilicity and oleophilicity in air and oleophobicity underwater, and they have porous interconnected networks, while their pore size distribution differs significantly. The foams can be used as 3D filters, able to separate, through gravity, surfactant-free, oil-in-water mixtures (10% w/w oil in water) with high oil rejection efficiencies and flow rates that depend on the type of foam. In particular, in the gravitydriven filtration process using 100 mL of the feed liquid, the PUEGr foams have an oil rejection efficiency of 96.85% and flow rate of 9988 L m −2 h −1 , while for the PUEGr_t foams the efficiency is higher (99.99%) and the flow rate is lower (8547 L m −2 h −1 ) due to their smaller pore size. Although the PUEGr_t foams have slower separation performance, they are more efficient for the separation of surfactant-free emulsions (1% w/w oil in water) reaching an oil rejection efficiency of 98.28%, higher than the 95.66% of the PUEGr foams of the same thickness. The foams can be used for several filtration cycles, as well as in harsh conditions without deteriorating their performance. The nature of raw materials, the simple solvent-free preparation method, the effective gravity-driven filtration even in harsh conditions, and their reusability suggest that the herein engineered foams have great potential for practical applications in oil−water separation through highly energy-efficient filtration.

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Synthesis and characterization of waterborne polyurethane emulsions based on poly(butylene itaconate) ester

Cited by 15 publications

References 26 publications

Biobased Waterborne Polyurethane-Urea/SWCNT Nanocomposites for Hydrophobic and Electrically Conductive Textile Coatings

Biobased Waterborne Polyurethane-Urea/SWCNT Nanocomposites for Hydrophobic and Electrically Conductive Textile Coatings

Biobased Waterborne Polyurethane-Ureas Modified with POSS-OH for Fluorine-Free Hydrophobic Textile Coatings

Expanded Graphite-Polyurethane Foams for Water–Oil Filtration

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