Calculation of Percent Crystallinity Thermal Properties

Calculation of Percent Crystallinity Thermal Properties -...

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Calculation of Percent Crystallinity Thermal Properties EMA 4666C By assuming that PET (100% crystallinity) has H f = 26.9 kJ/mol, then we can calculate H f in the unit of energy per weight by using the M.W. of PET repeating unit 192 g/mol H f (100%crystallinity) = 26.9/192 * 10 3 = 140.1 mJ/mg Result from group IA, IB (unit for H c , H f : mJ/mg) Sample H c H f H f - H c % crystallinity Amorphous 1 st heat Amorphous 2 nd heat 29.9 N/A 38.2 36.5 8.3# 36.5 8.3/140.1 * 100 = 5.9 36.5/140.1 * 100 = 26.1 Annealed N/A 37.5 37.5 37.5/140.1 * 100 = 26.8 Base bottle 9.3 42.2 32.9# 32.9/140.1 * 100 = 23.5 Mid section bottle N/A 37.8 37.8 37.8/140.1 * 100 = 27.0 Top bottle 25.9 36.3 10.4# 10.4/140.1 * 100 = 7.4 Result from group IIA, IIB (unit for H c , H f : mJ/mg) Sample H c H f H f - H c % crystallinity
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Unformatted text preview: Amorphous 1 st heat Amorphous 2 nd heat 22.4 N/A 32.5 33.1 10.1# 33.1 10.1/140.1 * 100 = 7.2 33.1/140.1 * 100 = 23.6 Annealed N/A 40.7 40.7 40.7/140.1 * 100 = 29.1 Base bottle## N/A 44.3 44.3 44.3/140.1 * 100 = 31.6 Mid section bottle N/A 41.5 41.5 41.5/140.1 * 100 = 29.6 Top bottle 22.4 31.5 9.1# 9.1/140.1 * 100 = 6.5 Remarks: # There is crystallization occurring in the DSC for these samples. Therefore, we must subtract part of crystallinity occurred in the DSC before calculating the original crystallinity in the samples. ## The sample was not taken from the very base of the bottle. Therefore, the % crystallinity is very close to the mid-section....
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This note was uploaded on 07/17/2011 for the course EMA 4666c taught by Professor Brennan during the Spring '08 term at University of Florida.

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Calculation of Percent Crystallinity Thermal Properties -...

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