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
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
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:B. Below is an image of typical data for the thermal analysis of a polymer sample on a
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
250
300
340
Temperature (C)
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