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6.3 A polymer sample is initially heated above its melting point, then rapidly quenched below its glass transition temperature. About 10 mg is then placed in a pan and a DSC experiment is conducted. A temperature ramp is used at 10 °C/min so that the polymer passes through its Tg and Tm values (curve 1). It is then cooled very slowly, allowing annealing to occur. A second heating cycle (from the same starting temperature also at 10 °C/min to above the Tm) will reveal a different DSC curve (curve 2). The sample is then treated the same as after the first cycle-cooled very slowly to anneal. A third run is conducted, starting below Tg and ending above Tm, but at a temperature ramp rate of 50 °C/min (curve 3). A. Qualitatively, draw three thermogram curves as label each as 1, 2 or 3. Label Tg & Tm B. Explain differences in the curves in the three DSC thermograms; compare the integrated areas of the melting peaks in each thermogram.

6.3 A polymer sample is initially heated above its melting point, then rapidly quenched below its glass transition temperature. About 10 mg is then placed in a pan and a DSC experiment is conducted. A temperature ramp is used at 10 °C/min so that the polymer passes through its Tg and Tm values (curve 1). It is then cooled very slowly, allowing annealing to occur. A second heating cycle (from the same starting temperature also at 10 °C/min to above the Tm) will reveal a different DSC curve (curve 2). The sample is then treated the same as after the first cycle-cooled very slowly to anneal. A third run is conducted, starting below Tg and ending above Tm, but at a temperature ramp rate of 50 °C/min (curve 3). A. Qualitatively, draw three thermogram curves as label each as 1, 2 or 3. Label Tg & Tm B. Explain differences in the curves in the three DSC thermograms; compare the integrated areas of the melting peaks in each thermogram.

Introduction to Chemical Engineering Thermodynamics
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
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6.3 A polymer sample is initially heated above its melting point, then rapidly quenched below its glass transition temperature. About 10 mg is then placed in a pan and a DSC experiment is conducted. A temperature ramp is used at 10 °C/min so that the polymer passes through its Tg and Tm values (curve 1). It is then cooled very slowly, allowing annealing to occur. A second heating cycle (from the same starting temperature also at 10 °C/min to above the Tm) will reveal a different DSC curve (curve 2). The sample is then treated the same as after the first cycle- cooled very slowly to anneal. A third run is conducted, starting below Tg and ending above Tm, but at a temperature ramp rate of 50 °C/min (curve 3). A. Qualitatively, draw three thermogram curves as label each as 1, 2 or 3. Label Tg & Tm B. Explain differences in the curves in the three DSC thermograms; compare the integrated areas of the melting peaks in each thermogram.
Transcribed Image Text:6.3 A polymer sample is initially heated above its melting point, then rapidly quenched below its glass transition temperature. About 10 mg is then placed in a pan and a DSC experiment is conducted. A temperature ramp is used at 10 °C/min so that the polymer passes through its Tg and Tm values (curve 1). It is then cooled very slowly, allowing annealing to occur. A second heating cycle (from the same starting temperature also at 10 °C/min to above the Tm) will reveal a different DSC curve (curve 2). The sample is then treated the same as after the first cycle- cooled very slowly to anneal. A third run is conducted, starting below Tg and ending above Tm, but at a temperature ramp rate of 50 °C/min (curve 3). A. Qualitatively, draw three thermogram curves as label each as 1, 2 or 3. Label Tg & Tm B. Explain differences in the curves in the three DSC thermograms; compare the integrated areas of the melting peaks in each thermogram.
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