B. Below is an image of typical data for the thermal analysis of a polymer sample on differential scanning calorimeter (DSC). • • • Why is the "cooling crystallization" offset from the melting point (278 °C)? What is the approximate glass transition temperature? Estimate from the "temperature rise" curve. Is melting an endothermic or exothermic process? Why might it be important not to take the temperature of the sample too high when heating? Endothermic energy Molding temperature: 300°C Mold temperature: 130°C Exothermic energy Temperature rise Cooling Melting point (Tm): 278°C Cooling crystallization 50 100 150 200 Temperature (C) 250 300 340

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