I\'m having a little trouble figuring this problem out... The density and associ

Question

I'm having a little trouble figuring this problem out...

The density and associated percent crystallinity for two poly(ethylene terephthalate) materials are shown,

(a) Compute the densities of totally crystalline and totally amorphous poly(ethylene terephthalate). (b) Determine the percent crystallinity of a specimen having a density of 1.382 g/cm3.

Explanation / Answer

Y - 74.3 = 663.1 (X - 1.408) .......At total crystalline ....Y = 100 ...=> 100 - 74.3 = 663.1 (X - 1.408) ...=> X = 1.4468 = Density .................At total amorphous .......Y = 0 ....=> - 74.3 = 663.1 (X - 1.408) .....=> X = 1.296 g/cm3 ...............b) X = 1.382 .....=> Y - 74.3 = 663.1 (1.382 - 1.408).....=> Y = 57.06 %

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