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Unsaturated polyester/polyurethane interpenetrating polymer networks (UP/PU IPNs) were prepared by varying the UP/PU weight ratios. Atomic force microscopy was applied to investigate the surface topographic images of IPNs with various UP/PU ratios: 100/0, 80/20, 70/30, and 50/50. The surface of pure UP was very flat. With increasing PU content, the surface appeared heterogeneous with a roughness of...
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