Phase inversion and its effect on the properties of polyester polyurethane cationomers |
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Authors: | Fu-Hu Su Show-An Chen Wu Chung Chan |
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Affiliation: | (1) Chemical Engineering Department, National Tsing-Hua University, 30043 Hsinchu, Taiwan;(2) Civil Engineering Department, Chung-Hua Polytechnic Institute, 30067 Hsinchu, Taiwan |
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Abstract: | Polyester polyurethane cationomers are prepared using polyester polyol of molecular weight 2000 as soft segments, N-methyl diethanolamine as chain extender, glycolic acid as quaternization agent, methyl ethyl ketone as solvent, and 4,4'-diphenylenemethylene diisocyanate (MDI) as diisocyanate. Properties of the films cast from solutions and emulsions are studied by infrared spectroscopy, dynamic mechanical analysis, thermogravimetric analysis, differential scanning calorimetry, and tensile-elongation testing. Ionization can cause phase separation and produces increased cohesion in the hard domains. The dispersion process can be divided into three stages involving a separation of hard segment aggregates due to adsorption of water on their surface, water entering into hard segment microionic lattics, and finally a rearrangement of agglomerates to form microspheres. The dispersion can disrupt the order in the hard domains and an increased phase separation. |
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Keywords: | Polyurethane ionomer 4 4'-diphenylene methylene diisocyanate Phase inversion Properties Polyester Segment |
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