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Unformatted text preview: ( % ) ) 2.144 51.3 2.215 74.2 (a ) Compute the densities of totally crystalline and totally amorphous polytetrafluoroethylene. (b ) Determine the percent crystallinity of a specimen having a density of 2.26 g/cm 3 . Chapter 15 Q4: Briefly explain how each of the following influences the tensile or yield strength of a semicrystalline polymer and why: (a) Molecular weight (b) Degree of crystallinity (c) Deformation by drawing (d) Annealing of an undeformed material ....
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- Spring '08