Abstract
A facile method, focusing on emulsification, chain extension and dispersion process in preparing waterborne polyurethane, was developed to prepare emulsion with rod-like nanoparticles. The facile method involves a water addition procedure by in situ generated water to react with polyurethane prepolymer instead of the external water addition process. As a comparison, waterborne polyurethane was synthesized through the external water addition process. According to the characterization methods including FTIR, 1H-NMR, TEM and water swelling experiments, it is suggested there are two kinds of hydrogen bonds interactions in hard/soft domain of the novel polyurethane, and the phase separation of hard/soft domains increases significantly. The morphology of the two polyurethanes was quite different (nanorods and spherical particles, respectively), presenting a different surface property. In addition, the water swelling of the novel polyurethane indicates that it holds significant potential application as degradable material.
Highlights
Water has been devoted to organic reactions due to the unusual properties in pure form and as a solvent, and even the induction of unique reactivity and selectivity, reduction of harmful organic solvents, and environmentally friendly chemical processes [1,2,3,4]
This study investigated the bulk structures of the polyurethane chains and nanoparticles, and water swelling property of waterborne polyurethane (WPU) dispersion prepared through in situ WGP
The results suggest stronger hydrogen bonding interactions of sample PUD1 synthesized via the new path
Summary
Water has been devoted to organic reactions due to the unusual properties in pure form and as a solvent, and even the induction of unique reactivity and selectivity, reduction of harmful organic solvents, and environmentally friendly chemical processes [1,2,3,4]. One of the most important applications of water in organic reactions is the synthesis of waterborne polyurethane (WPU) dispersion, in which water plays a key role due to the aqueous synthetic environment [5,6]. The most widely used synthesis route of WPU is to add deionized water into WPU precursor to emulsify and disperse the hydrophilic WPU prepolymer, with the process of chain extension [7,8,9], which was called as external water addition synthesis process. Water, playing the role of chain extender, emulsifier and solvent, or maybe more, is one of the most important components to decide whether WPU can be obtained. Williams et al [10] reported that water acts as a plasticizer and significantly influences the mechanical performance due to the expected hydrophilic
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