Synthesis and characterization of novel fluoroalkyl-terminated hyperbranched polyurethane latex

Xu, Wenji; Zhao, Weihong; Hao, Lifen; Wang, Sha; Pei, Mengmeng; Wang, Xuechuan

doi:10.1016/j.apsusc.2017.12.148

Cited by 40 publications

(17 citation statements)

References 28 publications

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“…The Si wafers were purchased from Shanghai Songjiang Silicon Material Co., Ltd., Shanghai, China and were used in fine morphology detection. Before use, those samples were rinsed and disposed on the basis of our previous works [18,19].…”

Section: Methodsmentioning

confidence: 99%

Preparation, Characterization and Performance Properties of Polydodecylmethylsilsesquioxane Nanoparticles

Deng

Jiang

2020

Coatings

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A series of polydodecylmethylsilsesquioxane (PDMSQ) nanocomposite latexes were prepared via emulsion polymerization of methyltriethoxysilane (MTES) and dodecyltrimethoxysilane (DTMS) and sodium hydroxide as the catalyst, and sodium dodecyl benzene sulfonate/Tween 80 as the mixed emulsifiers. Effects of the emulsifier doses, the reaction temperature, the catalyst concentration and the oil/water ratio on the particle size and distribution of the PDMSQ nanoparticles were discussed. Particle size and micromorphology, structure, thermal stability, crystallinity and hydrophobicity of PDMSQ nanoparticles (PDMSQ NPs) were investigated by dynamic laser scattering (DLS), Fourier transform infrared spectroscopy (FTIR), silicon-nuclear magnetic resonance (28Si-NMR), X-ray photoelectron spectroscope (XPS), scanning electron microscope (SEM), transmission electron microscope (TEM), atomic force microscope (AFM), thermo gravimetric analysis (TGA), X-ray diffraction (XRD) and contact angle tester. Results showed that a series of PDMSQ NPs could be obtained with an average particle size of less than 80 nm and narrow distribution as well as spherical structure under the optimal process conditions. PDMSQ NPs exhibited excellent thermal stability and were mainly amorphous but also contained some crystal structures. Importantly, the static water contact angles (WCAs) on its latex films were larger than 150° and the WCAs hysteresis were less than 10°, thus those PDMSQ nanocomposite latexes show potential in the field of superhydrophobic coatings.

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Section: Methodsmentioning

confidence: 99%

Preparation, Characterization and Performance Properties of Polydodecylmethylsilsesquioxane Nanoparticles

Deng

Jiang

2020

Coatings

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“…e initial degradation temperature (5% mass loss temperature, T d ), the maximum degradation temperature (which corresponds to the depolymerization of polyurethane, T max ), the maximum thermal weight loss rate (V max ), different decomposition stage (T stage ), and the char residue at 800°C of flame retardants and SPUF composites are listed in Table 3. It can be seen that the SPUF without flame retardant has two degradation processes at 215∼450°C and 450∼600°C, respectively [37]; the first degradation step was mainly due to the depolymerization of polyurethane chains to form isocyanate, polyol, primary or secondary amine, olefin, and carbon dioxide; after this degradation process, the residue mass is about 20%, the maximum mass loss temperature of SPUF is 388°C, and only 13.1% char residue remains at 800°C. ermal decomposition of APP/SPUF shows three processes, and its T d is 110°C.…”

Section: Ermal Propertiesmentioning

confidence: 99%

Synergistic Flame Retardant Effects of Expandable Graphite and Ammonium Polyphosphate in Water-Blow Polyurethane Foam

Yao

Zhang

Zhang³

et al. 2019

Advances in Materials Science and Engineering

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In this research, expandable graphite (EG) and ammonium polyphosphate (APP) were incorporated into water-blow semirigid polyurethane foam (SPUF) as flame retardants. The synergistic flame retardant effects of EG with APP in SPUF had been studied by thermogravimetric analysis (TGA), limiting oxygen index (LOI), horizontal burning test, polarizing microscope, and scanning electron microscopy (SEM). The results indicated that APP and EG used together in SPUF could effectively improve the flame retardancy of SPUF. When the EG to APP ratio reached 2 : 1 under the total content of flame retardants was kept constant as 20%, the LOI value was increased by about 51% compared to pure SPUF, 2.9% to SPUF/EG and 16.3% to SPUF/APP. Besides, the residual char was increased up to 27.7% displayed by TG test results. SEM shows that burned residues of EG/APP/SPUF present more compact char and worm-like structure. Furthermore, EG shows negative effect on the mechanical property of SPUF with 21.7% decrease in compression modulus, but the mechanical property can be improved by the addition of appropriate content of APP.

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“…[3][4][5][6][7][8] The effect of film composition on water absorption has been studied extensively. Indeed, raising film hydrophobicity by increasing the concentration of fluorinated monomers [9][10][11][12][13][14][15][16] has been shown effective in reducing water absorption, but fluorinated latexes are limited by high financial cost 10,11,13 and difficulty in synthesis due to chemical incompatibility between fluorinated molecules and water. 12,15 Raising film hydrophilicity has the opposite effect, as increasing concentration of polar functional groups, such as carboxylic acid, 8,17 hydroxyl 8,[18][19][20] and sulfonic acid, 21 raises water absorption.…”

Section: Introductionmentioning

confidence: 99%

Coupled effect of water absorption and ion transport in hydrated latex anti-corrosion coatings

et al. 2022

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Water-based anti-corrosion coatings, which are environmentally-friendly replacements for organic solvent-based coatings, do not perform well enough for use in the most challenging corrosion environments. The high water absorption capacity of water-based latex films may reduce barrier performance by contributing to corrosive reactant/product transport. We seek to understand the coupled effects of water absorption and ion transport in hydrated latex films, and to propose mechanisms explaining these effects. Water absorption and ion transport in films immersed in deionized (DI) water were monitored by mass gain and electrical conductivity measurements, respectively. Despite very similar polymer compositions between films, large differences in water absorption and ion transport rates were observed and explained by percolating networks at latex particle boundaries which facilitate transport. A semi-continuum model with three-component diffusion and convection-like elastic relaxation supported the assumptions of the physical mechanisms governing water absorption and ion transport. The evidence of the coupled processes of water absorption and ion transport in hydrated latex films revealed in this study are useful for designing water-based coatings that provide high levels of corrosion resistance.

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Synthesis and characterization of novel fluoroalkyl-terminated hyperbranched polyurethane latex

Cited by 40 publications

References 28 publications

Preparation, Characterization and Performance Properties of Polydodecylmethylsilsesquioxane Nanoparticles

Preparation, Characterization and Performance Properties of Polydodecylmethylsilsesquioxane Nanoparticles

Synergistic Flame Retardant Effects of Expandable Graphite and Ammonium Polyphosphate in Water-Blow Polyurethane Foam

Coupled effect of water absorption and ion transport in hydrated latex anti-corrosion coatings

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