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HSM micrographs for PU at different temperatures: (A)—PU at 25 °C; (B)—PU at 25 °C—back cooled product; (C)—PU at 245 °C—melting starts; (D)—PU at 250 °C—partially melted; (E)—PU at 255 °C—partially melted; (F)—PU at 260 °C—melted. The magnification in the photographs was 59.7×.
