Problem

For each of the following pairs of polymers, plot and label schematic stress–strain curves...

For each of the following pairs of polymers, plot and label schematic stress–strain curves on the same graph [i.e., make separate plots for parts (a) to (c)].

(a) Isotactic and linear polypropylene having a weight-average molecular weight of 120,000 g/mol; atactic and linear polypropylene having a weight-average molecular weight of 100,000 g/mol


(b) Branched poly(vinyl chloride) having a degree of polymerization of 2000; heavily crosslinked poly(vinyl chloride) having a degree of polymerization of 2000


(c) Poly(styrene–butadiene) random copolymer having a number-average molecular weight of 100,000 g/mol and 10% of the available sites crosslinked and tested at 20°C; poly(styrene–butadiene) random copolymer having a numberaverage molecular weight of 120,000 g/mol and 15% of the available sites crosslinked and tested at –85°C. Hint: poly(styrene–butadiene) copolymers may exhibit elastomeric behavior.

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