Question: The density and associated percent crystallinity for two poly(ethylene terephthalate) materials are as follows: (g/cm3) ____________ crystallinity (%) 1.408 .............................. 74.3 1.343 .............................. 31.2

The density and associated percent crystallinity for two poly(ethylene terephthalate) materials are as follows:

ρ (g/cm3) ____________ crystallinity (%)

1.408 .............................. 74.3

1.343 .............................. 31.2

(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?

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