Results 251 to 260 of about 10,906 (271)
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Hybrids of colloidal silica and waterborne polyurethane
Journal of Colloid and Interface Science, 2006Waterborne polyurethane (WPU) was synthesized and followed by adding colloidal silica to prepare WPU-silica hybrids. The silica content in the hybrid thin films was varied from 0 to 50 wt%. The experimental results revealed that the viscosity of these hybrid solutions increased with increasing silica content and resulted in the aggregation of silica ...
Chien-Hsin Yang +3 more
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Applications of Waterborne Polyurethanes Foams
2021Polyurethane foams are one of the versatile commercial materials ranging from solvent-based polyurethane foams to waterborne polyurethane foams (WPU). Waterborne polyurethanes are eco-friendly and exhibit excellent mechanical characteristics such as strength, flexibility, ease of moulding into required shapes, durability, lightweight and resistance to ...
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Waterborne polyurethanes: Spectroscopy and stability of emulsions
Journal of Applied Polymer Science, 2006AbstractWe prepared waterborne polyurethanes based on isophorone diisocyanate, dimethylolpropionic acid, polyhexane neopentyl adipate glycol, or polyethylene–butylene adipate glycol through self‐emulsion (a prepolymerization process). Their IR and NMR spectroscopic properties were investigated, and the peaks of these spectra were assigned.
Yingmei Xu +4 more
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Modification of waterborne polyurethanes by acrylate incorporations
Journal of Applied Polymer Science, 1995AbstractWaterborne polyurethanes (PUs) were hydrophobically modified using various types of acrylate monomers. PUs having hydroxy ethylacrylate (HEA) terminal groups were first obtained following a prepolymer mixing process. These PU base polymers were then chain extended with acrylate monomers via a radical polymerization mechanism.
Byung Kyu Kim, Jong Cheol Lee
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Improved Water Resistance of Waterborne Polyurethane
Advanced Materials Research, 2010The introduction of hydrophilic groups, such as -COOH, -SO3, -OH, -O-, into the polyurethane resin, so that waterborne polyurethane products in the water resistance, solvent resistance, weather and other aspects of performance are worse than solvent borne systems. In our work, to improve the water resistance of the films for waterborne polyurethane, we
Hong Zhu +4 more
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Properties and Characterization Techniques for Waterborne Polyurethanes
2021Polyurethanes are a class of polymeric materials possessing a broad range of properties and characteristics both chemical and physical when compared with monolithic materials. Due to a wide availability of monolithic materials commercially and due to the fact that the properties of those materials could be altered suitably, combination of polyurethanes
D. Balaji +3 more
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A Solventless Waterborne Polyurethane Emulsifying Investigation
2007 1st International Conference on Bioinformatics and Biomedical Engineering, 2007A solventless waterborne polyurethane emulsion is synthesized by prepolymerization. The effecting factors including the ratio of isocyanate content to hydroxyl group's (-NCO/-OH), the reaction temperature and the carboxyl group content (- COOH %) on target prepared emulsion's viscosity; particle diameter and the water absorption are experimentally ...
Quanguo He +3 more
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RETRACTED ARTICLE: Pyrolysis study of waterborne polyurethane [PDF]
Journal of Wuhan University of Technology-Mater. Sci. Ed., 2010 The thermal degradation of synthetic waterborne polyurethane (PU) based on toluenediisocyanate (TDI) was investigated by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) and thermogravimetry (TG). The degradation profiles of cast films obtained from dispersions were evaluated.
Huanqin Chen +3 more
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Oil modified and waterborne polyurethane resin
Journal of Coatings Technology, 2002Air-dried water-dispersed polyurethane resins were produced from poly(propylene-ethylene) copolymer triol, monoglyceride, toluene diisocyanate, and tartaric acid. Monoglyceride and poly(propylene-ethylene) copolymer triol were employed at different ratios, with the monoglyceride ranging between 50–70% of the total polyol used, and the isocyanate ...
Yasir Idlibi +2 more
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Study on Synthesis of Environmental Waterborne Polyurethane
Advanced Materials Research, 2012A MDI-based waterborne polyurethane emulsion(PU) was synthesized by the reaction of polyester glycol(PBA), di-methylol propionic acid(DMPA) with 4,4`-diphenylmethane diisocyanate (MDI) instead of toluene di-isocyanatotoluene(TDI) because of its low toxicity, low saturated vapor pressure. The factors influencing the properties of waterborne polyurethane
Hong Lu Xie +3 more
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