Thermal-Properties - EMA 4161C POLYMER PROCESSING THERMAL...

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EMA 4161C POLYMER PROCESSING THERMAL PROPERTIES LABORATORY PURPOSE: Receive training on the differential scanning calorimeter (DSC) and utilize DSC to measure the thermal response of poly(ethylene terephthalate) (PETP). The thermal characteristics of a polymer including Tg, Tm, enthalpy of fusion, and crystallinity will be measured using the DSC. LAB. PREPARATION: Questions to ponder: 1. How does a DSC work and what can it measure these properties? 2. What thermal transitions might you expect to see in the DSC traces from the PETP samples? 3. Hypothesize about the crystallinity of the PETP samples taken from the different locations as it relates to the way the bottle was processed (review from the experiment 1), and the effect on thermal properties, i.e., the DSC traces. 4. Discuss anything else which may pertain to this lab. MATERIALS: Empty 2L clear soft drink PETP bottle Amorphous PETP Film Annealed PETP Film Aluminum pans and covers Liquid nitrogen EQUIPMENT: Differential Scanning Calorimeter-Seiko Model DSC220C Auto cooling controller/dewar Digital Scale Razor blade or scissors Thermal protective gloves (cryogenic) Safety glasses PROCEDURE: Five PETP samples (amorphous PETP film, annealed PETP film, neck of PETP bottle, mid-section of PETP bottle, and base of PETP bottle) will be characterized using the DSC to measure degree of crystallinity, Tg, Tm, and enthalpy of fusion (
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Thermal-Properties - EMA 4161C POLYMER PROCESSING THERMAL...

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