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14.26 The density and associated percent crystallinity for two polypropylene materials are as follows: r (g/cm3)...

14.26 The density and associated percent crystallinity for two polypropylene materials are as follows:

r (g/cm3)                 Crystallinity (%)

    0.904                            62.8

    0.895                            54.4

(a) Compute the densities of totally crystalline and totally amorphous polypropylene.

(b) Determine the density of a specimen having 74.6% crystallinity.

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