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This study aimed to synthesize a cationic waterborne polyurethane acrylate–modified epoxy acrylic resin (CWEA) from bisphenol A epoxy resin, acrylic acid, 2,4-toluene diisocyanate, polyethylene glycol 400 (PEG-400), 2-hydroxyethyl acrylate, and hydroquinone as inhibitors and N,N -dimethylbenzylamine as a catalyst. The changes in the NCO groups and...
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Context 1
... graph in figures 3~5 indicated the correlation between the NCO content and the time in the three stages during steps 2~4. The PEG was added to 2,4-TDI in stage 2 ( figure 3). The angular coefficient of curve demonstrated that the NCO groups of TDI fast reacted with the oxhydryl of PEG during the reaction. ...
Citations
Polyurethane (PU) covers a range of applications in wearable circuits, coating materials, foaming industries, surgical equipments, packing materials and replacement of plastic materials. As per broad applications spectrum, huge data on PU synthesis has been reported so far, with different types of polyols, isocyanates, organic acids, acrylates with different chain extenders, catalysts, emulsifiers and/or PI. In this review, for a comprehensive study of structure‐activity relationship, data from last 5 years has been compiled for photo‐curable PU categorized on the basis of solvent as well as acrylate components. In this review a range of parameters including tensile strength, hardness, flexibility, hydrophobicity/hydrophilicity, solvent resistance, storage/young's modulus, shape recovery, viscosity, curing kinetics and thermal stability has been compared against composition.
Four different systems of cast polyurethane elastomers were prepared through two‐step method by adjusting different isocyanates and amine chain extenders. The blocked polyurethane prepolymer synthesized by the reaction of methyl ethyl ketoxime (MEKO) and the prepolymer weakens the reactivity with the amine chain extender. The mechanical and thermal properties of cast polyurethane prepared by different combinations were analyzed through comparison. The microphase separation of hard and soft segments structure in different systems were observed by using atomic force microscope (AFM). Through dynamic mechanical analysis (DMA), the influence of various structures on the loss factor is discussed. Studying the dynamic endogenous heat of cast polyurethane (CPU) by changing the hard segment structure provides a novel idea for the construction of polyurethane with low‐damping structure.
Waterborne polyurathenes (WBPUs) possess flexible properties and are environmentally friendly, these properties of WBPUs have attracted growing interest in an extensive range of industrial applications. While wide work on WBPU synthesis has been reported, still some primary component roles in synthesis remain uncertain. WBPU can be formulated in minimal to no co-solvent coatings and adhesives forming films that form films. These are highly adherent to numerous materials that include polymeric fibres and glass. These eco-friendly WBPUs do not contaminate the soil or generate wastewater as well as are non-flammable and safe. Generally, WBPUs are water insoluble and hydrophobic and for dispersion of WBPUs in water, these need to be modified. This chapter summarizes various modified WBPUs composites along with their properties and applications.
