Assume you have 3 PET samples. The densities and percent crystallinities for 2 o

Question

Assume you have 3 PET samples. The densities and percent crystallinities for 2 of the samples PET 1 and PET 2 are below. Use this information to determine the percent crystallinity for a 3rd PET sample, PET3. PET 3 has a density of 1.382 g/cm3. a. PET 1: Density: 1.408 g/cm^3 Crystallinity: 74.3% PET 2: Density: 1.343 g/cm^3 Crystallinity: 31.2% Percent crystallinity may also be determined using outputs from DSC Explain how DSC works. Explain how you can determine percent crystallinity from DSC Using this article: notes/app thermal crystallini plastics pdf and the information below Determine the percent crystallinity in another PET sample delta Hm = 70 J/g delta Hc = 5 J/g

Explanation / Answer

Answer of (4)

Now we are determining the percentage crystallinity of PET3 with s =1.382 g/cm3 as per below equation,

% crystallinity of PET3 = {c (s - a)} / {s (c - a)} * 100

= {1.408 (1.382 - 1.343)} / {1.382 (1.408 - 1.343)} * 100

= (0.0549 / 0.0898)*100

  = 61.13%

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