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Effect of phase separation on the water resistance of green waterborne polyurethanes was discussed for the first time. Phase separation was studied through the application of dynamic mechanical analysis. Water resistance was characterized by water absorption ratio and water contact angle. The results showed that the phase separation had stronger effect on water resistance compared with the content of hydrophilic segments of green waterborne polyurethanes; higher phase separation degree led to better water resistance even though the content of hydrophilic segments increased. And, fluorescence microscope images of fluorescent dye inside the green waterborne polyurethane films justified this viewpoint.
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Xiao et al. (2017) studied this question.
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