Effect of phase separation on water resistance of green waterborne polyurethanes: Unexpected stronger impact compared to hydrophilic segments

Xiao, Yao; Bao, Lixia; Fu, Xiaowei; Wu, Bo; Kong, Weibo; Zhou, Changlin; Lei, Jingxin

doi:10.1002/adv.21818

Cited by 20 publications

(15 citation statements)

References 42 publications

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“…The high enough water vapor pressure caused the water vapor molecules to further diffuse from the HNTSs to the outside of film, significantly increasing the WVP of composite film. [ 40 ] However, When the introduced HNTSs were broken, the relatively “free” passage for the water vapor molecules diffusion was partially blocked. Thence the WVP of composite film was not further enhanced and even weaken.…”

Section: Resultsmentioning

confidence: 99%

“…The reason may be that excessive HNTSs were agglomerated in the prepolymer, which reduced film formation water resistance. [ 40 ]…”

Section: Resultsmentioning

confidence: 99%

“…The 30 mm × 30 mm square SFPU/HNTSs composite membrane was soaked in water for 24 hr, the change was measured before and after. Calculate the water absorption of films according to the following formula [ 40 ] :

W = \frac{M_{0} - M_{1}}{M_{1}} \times 100 %

where W was the water resistance, M 0 was the quality of composite film after immersing, and M 1 was the quality of composite film before immersing.…”

Section: Performance Tests Of Sfpu/hntss Composite Filmmentioning

confidence: 99%

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Water vapor permeability and self‐cleaning properties of solvent‐free polyurethane improved by hollow nano‐TiO₂ spheres

Guo

Lyu

Gao

et al. 2020

J of Applied Polymer Sci

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In the synthetic leather industry, solvent-free polyurethane film (SFPU) was poor in water vapor permeability (WVP) and washability. In this study, we introduced the hollow nano-TiO 2 spheres (HNTSs) with high photocatalytic performance and permeability performance as well as large surface area into the SFPU film to endued its superior water vapor permeability property, selfcleaning performance and water resistance. First of all, HNTSs were prepared via the controllable chemical route using HF for internal corrosion of solid nano-TiO 2 spheres, and then introduced into hydroxyl prepolymer to prepare solvent-free polyurethane/HNTSs composite film. The results of SEM, FT-IR and UV analyses indicated HNTSs were successfully dispersed evenly into SFPU. Application experiment results showed that the addition of HNTSs with hollow structure had an important effect on the WVP, photocatalytic performance, mechanical property, the water vapor transmission rate, self-cleaning performance as well as tensile strength were increased by 111.98%, more than 100%, and 36.368%, respectively.

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Section: Resultsmentioning

confidence: 99%

“…The reason may be that excessive HNTSs were agglomerated in the prepolymer, which reduced film formation water resistance. [ 40 ]…”

Section: Resultsmentioning

confidence: 99%

W = \frac{M_{0} - M_{1}}{M_{1}} \times 100 %

where W was the water resistance, M 0 was the quality of composite film after immersing, and M 1 was the quality of composite film before immersing.…”

Section: Performance Tests Of Sfpu/hntss Composite Filmmentioning

confidence: 99%

See 1 more Smart Citation

Water vapor permeability and self‐cleaning properties of solvent‐free polyurethane improved by hollow nano‐TiO₂ spheres

Guo

Lyu

Gao

et al. 2020

J of Applied Polymer Sci

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“…These microcapsules ensure high encapsulation efficiency and long‐term release for the core materials. Moreover, as fabricated from IPDI and pentaerythrotol, the shell is a polyurethane material, which owns good mechanical strength and water resistance resulting in excellent protection for the core materials …”

Section: Resultsmentioning

confidence: 99%

Preparation of monosultap‐polyurethane microcapsules in an inverse emulsion through interfacial polymerization

Wang

Xiao

2019

J of Applied Polymer Sci

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In this study, we prepared monosultap microcapsules in an inverse emulsion through interfacial polymerization for the first time. The microcapsules are spherical pellets with intact and smooth shell and have a narrow particle size distribution with an average size of about 2.35 μm. More importantly, our microcapsules have excellent thermal stability with a starting decomposition temperature of 233.1 C, high encapsulation efficiency of 81.9% as well as long-term slow release of monosultap under different conditions. In addition, the shell of the microcapsules can degrade completely in the natural condition, avoiding the pollution to the environment. It can be believed that our microcapsules will show good service performance if employed in agricultural industry.

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“…Due to its outstanding structure designability, waterborne polyurethane (WPU) has been widely applied in several industrial fields [1][2][3][4][5], like coating, sizing agent, and smart surface material, etc. [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Waterborne Poly(Urethane-Acrylate) Nanoemulsions Based on Cationic Polymerizable Macrosurfactants with Different Hydrophobic Side Chain Length

et al. 2019

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In situ surfactant-free emulsion polymerization can help avoid the utilization of harmful co-solvents and surfactants in the preparation of waterborne poly(urethane-acrylate) (WPUA) nanoemulsion, but the solid content is extremely limited, which will affect the drying rate and film-forming properties. The utilization of polymerizable macrosurfactants can overcome the above problems. However, the research on cationic polymerizable macrosurfactants is extremely scarce. In this work, cationic dimethylaminoethyl methacrylate-b-alkyl methacrylates block copolymers (PDM-b-PRMA) with terminal double bonds and different hydrophobic side chain (HSC) lengths were fabricated via catalytic chain transfer polymerization (CCTP). HSC length of PDM-b-PRMA played an important role in the phase inversion, morphology, rheological behavior of WPUA nanoemulsions, as well as the comprehensive performance of WPUA/PDM-b-PRMA films. Polymerizable PDM-b-PBMA macrosurfactant had smaller molecular weight, lower surface tension and colloidal size than the random copolymer (PDM-co-PBMA) by traditional free radical polymerization. It was easy for PDM-b-PRMA to orientedly assemble at the oil/water interface and provide better emulsifying ability when the carbon number of HSC was four. Compared with WPUA/PDM-co-PBMA, WPUA/PDM-b-PBMA had a smaller particle size, stability and better film-forming properties. This work elucidated the mechanisms of HSC length in the fabrication of cationic PDM-b-PRMA and provides a novel strategy to prepare cationic WPUA of high performance.2 of 17 have [17] developed a poly(urethane-acrylate) (PUA) with enhanced ionic conductivity and excellent mechanical properties.PUA comprised the advantages of both polyurethane and acrylic polymers, and has been widely used in coatings, adhesives, and surface treatments [17,18]. Up to date, researchers have developed the focus of PUA research into waterborne poly(urethane-acrylate) (WPUA) to reduce the utilization of organic solvents, including anionic, cationic, and nonionic WPUA [19,20]. Heretofore, anionic WPUA has been extensively investigated [21][22][23][24][25]. Fei et al. [26] have used pentaerythritol triacrylate and hydroxyethyl acrylate as cross-linker to fabricate WPUA microemulsions, which was able to increase the mechanical properties and water resistance of cellulose fiber-based paper. Hou et al. [27] have prepared a waterborne anionic alkoxysilane-terminated polyurethane dispersion, which exhibited mechanical properties and excellent freeze-thaw stability.Compared with anionic WPUA, cationic WPUA displays better adhesion to anionic substrates such as cellulose fiber paper, glass and leather, etc. [28][29][30]. However, investigations on cationic WPUA are relatively rare to date [31,32]. Sheng et al. [33] have obtained WPUA with long-chain hydrophobic alkyl structure by radical polymerization of stearyl acrylate with double bond end-capped WPU, which has been used for water repellents. Heretofore, several approaches have been adopted to prepare WPUA, such as phys...

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Effect of phase separation on water resistance of green waterborne polyurethanes: Unexpected stronger impact compared to hydrophilic segments

Cited by 20 publications

References 42 publications

Water vapor permeability and self‐cleaning properties of solvent‐free polyurethane improved by hollow nano‐TiO₂ spheres

Water vapor permeability and self‐cleaning properties of solvent‐free polyurethane improved by hollow nano‐TiO₂ spheres

Preparation of monosultap‐polyurethane microcapsules in an inverse emulsion through interfacial polymerization

Optimization of Waterborne Poly(Urethane-Acrylate) Nanoemulsions Based on Cationic Polymerizable Macrosurfactants with Different Hydrophobic Side Chain Length

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Effect of phase separation on water resistance of green waterborne polyurethanes: Unexpected stronger impact compared to hydrophilic segments

Cited by 20 publications

References 42 publications

Water vapor permeability and self‐cleaning properties of solvent‐free polyurethane improved by hollow nano‐TiO2 spheres

Water vapor permeability and self‐cleaning properties of solvent‐free polyurethane improved by hollow nano‐TiO2 spheres

Preparation of monosultap‐polyurethane microcapsules in an inverse emulsion through interfacial polymerization

Optimization of Waterborne Poly(Urethane-Acrylate) Nanoemulsions Based on Cationic Polymerizable Macrosurfactants with Different Hydrophobic Side Chain Length

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Water vapor permeability and self‐cleaning properties of solvent‐free polyurethane improved by hollow nano‐TiO₂ spheres

Water vapor permeability and self‐cleaning properties of solvent‐free polyurethane improved by hollow nano‐TiO₂ spheres