(Solution) - For each of the following pairs of polymers plot and -(2025 Original AI-Free Solution)

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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), (b), and (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 cross linked 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 cross linked and tested at 20°C; poly(styrene-butadiene) random copolymer having a number-average molecular weight of 120,000 g/mol and 15% of the available sites cross linked and tested at -85°C.