H4 F10 - ENMA 300 ENME 382 Homework 4 Due: Thursday,...

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Unformatted text preview: ENMA 300 ENME 382 Homework 4 Due: Thursday, October 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 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 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 1 3. Callister 4.8 The number-average molecular weight of a poly(acrylonitrile-butadiene) alternating copolymer is...
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This note was uploaded on 08/02/2011 for the course ENMA 300 taught by Professor Alsheikhly during the Spring '11 term at University of Maryland Baltimore.

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H4 F10 - ENMA 300 ENME 382 Homework 4 Due: Thursday,...

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