Problem set 2 - 20 pts 3 Equilibrium osmotic pressure heads(h measured at 22 o C for a series of solutions of a polystyrene sample in toluene are

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Problem Set #2 POLYMERIC MATERIALS Due date 2/8/11 20 pts 1) A mixture of several fractions of poly(ethylene) were blended to modify the molding characteristics of the blend. Calculate the number average molecular weight given that these fractions were combined. Fraction Weight fraction DPn 1 0.1 5000 2 0.2 10,000 3 0.5 15,000 4 0.1 20,000 5 0.1 30,000 10 pts 2.) This polystyrene has a number average molecular weight of 100,000 and a polydispersity of 5. What is the weight average molecular weight?
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Unformatted text preview: 20 pts 3) Equilibrium osmotic pressure heads (h) measured at 22 o C for a series of solutions of a polystyrene sample in toluene are tabulated below:’ Polystyrene concentration (g/dm 3 ) h (mm toluene) 2.6 5.85 5.2 12.93 8.7 24.37 11.8 36.34 15.1 50.99 Assuming that the densities of toluene and polystyrene at 22 C are respectively 0.867 g/cc and 1.05 g/cc, calculate number average molecular weight for the sample of polystyrene and an estimate of polystyrene-toluene interaction parameter....
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This note was uploaded on 02/14/2011 for the course ORGANIC CH 341 taught by Professor Idk during the Spring '11 term at Wisconsin.

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