Huntley_Experiment 2

Huntley_Experiment 2 - Experiment 2 Differential Scanning...

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Unformatted text preview: Experiment 2, Differential Scanning Calorimetry (DSC) of Poly(Ethylene Terephthalate) Experiment 2, Differential Scanning Calorimetry (DSC) of Poly(Ethylene Terephthalate) Author: Michelle Huntley Group 2 Section 2, T 11:00 AM- 2:00 PM Partner: Grant Robertson 2/8/2011 Abstract: The following lab report discusses laboratory experiment 2 of CH 340 at Clemson University. The experiment deals with the method of differential scanning Huntley Page 1 2/8/2011 Experiment 2, Differential Scanning Calorimetry (DSC) of Poly(Ethylene Terephthalate) calorimetry of a beverage bottle in order to analyze the enthalpy of fusion and the concept of recrystallization. The sample was prepared by the students and two runs of the experiment were held, one original sample and one sample after a quenching period. The quenched sample showed a glass transition region on the DSC output as well a recrystallization exotherm and a melt endotherm, while the original sample only showed the melt endotherm. Additionally, an indium sample was used to calibrate the calorimeter. Huntley Page 2 2/8/2011 Experiment 2, Differential Scanning Calorimetry (DSC) of Poly(Ethylene Terephthalate) I. Introduction Laboratory experiment two of CH 340 at Clemson University focuses on the polymer poly(ethylene terephthalate), (PET). PET is produced using a two-step condensation reaction consisting of a transesterification to form a diol ester and low molecular weight oligomers, which consist of only a few monomer units, followed by a melt polycondensation step. PET exists in a partially crystalline form to make plastic soda bottles. This experiment required analysis of the fraction of crystallinity of the PET. A differential scanning calorimeter was used in this experiment to evaluate the melting temperature and enthalpy of fusion of the PET sample twice. Initially, an indium sample was used to find the calibration factor for the metling temperature and enthalpy of fusion of the PET samples. Two samples of the PET were run in the differential scanning calorimeter, a quenched and an unquenched sample. Diethylene glycol monomers are incorporated into the PET as copolymers which then lowers the temperature of fusion. Additionally, the diethylene glycol lowers the crystalline fraction of the PET. This relationship can be shown below in Equation 1. Using the temperature of fusion of the PET sample, the weight percent of diethylene glycol (DEG) can be determined....
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Huntley_Experiment 2 - Experiment 2 Differential Scanning...

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