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HW4 ENME382 S10 Section0201

HW4 ENME382 S10 Section0201 - 0.08 0.15 32,000–44,000...

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1 ENME 382 Section 0201 Homework#4 Due in class: Friday, March 5, 2010 1. Callister 4.3 Below, molecular weight data for a polytetrafluoroethylene material are tabulated. Compute (a) the number-average molecular weight, (b) the weight-average molecular weight, and (c) the degree of polymerization. Molecular Weight Range ( g/mol ) x i w i 10,000–20,000 0.03 0.01 20,000–30,000 0.09 0.04 30,000–40,000 0.15 0.11 40,000–50,000 0.25 0.23 50,000–60,000 0.22 0.24 60,000–70,000 0.14 0.18 70,000–80,000 0.08 0.12 80,000–90,000 0.04 0.07 2. Callister 4.4 4 Is it possible to have a poly(vinyl chloride) homopolymer with the following molecular weight data, and a degree of polymerization of 1120? Why or why not? Molecular Weight Range ( g/mol ) x i w i 8,000–20,000 0.02 0.05 20,000–32,000
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Unformatted text preview: 0.08 0.15 32,000–44,000 0.17 0.21 44,000–56,000 0.29 0.28 56,000–68,000 0.23 0.18 68,000–80,000 0.16 0.10 80,000–92,000 0.05 0.03 2 3. Callister 4.7 Make comparisons of thermoplastic and thermosetting polymers (a) on the basis of mechanical characteristics upon heating, and (b) according to possible molecular structures. 4. Callister 4.8 The number-average molecular weight of a poly(acrylonitrile-butadiene) alternating copolymer is 1,000,000 g/mol; determine the average number of acrylonitrile and butadiene repeat units per molecule. 5. a) What is a mer? b) What is the mer for PTFE (polytetrafluoroethylene)? c) What is the mer for polyvinylchloride (PVC)? d) What is the mer for polystyrene (PS)?...
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HW4 ENME382 S10 Section0201 - 0.08 0.15 32,000–44,000...

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