Problem set 3

# Problem set 3 - Problem Set #3 POLYMERIC MATERIALS Due date...

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Problem Set #3 POLYMERIC MATERIALS Due date 2/15/11 20 pts 1) Rayleigh ratios (R θ ) were obtained at 25 o C for a series of solutions of a polystyrene sample in benzene, with the detector situated at various angles ( θ ) to the incident beam of unpolarized monochromatic light of wavelength 546.1nm. The results are tabulated below: Under the conditions of these measurements the Rayleigh ratio and refractive index of benzene are 46.5 X 10 -4 m -1 and 1.502 respectively, and the refractive index increment for the polystyrene solutions is 1.08 X 10 -4 dm 3 g -1 . Using a Zimm plot, determine: (a) the weight average molar mass of the polystyrene sample (b) the radius of gyration ( s 2 1/2 ) of polystyrene molecules in benzene at 25 o C. (c) the second virial coefficient (A 2 ) for the polystyrene-benzene interaction at 25 o C. 20 pts 2. The tables below give the mean flow times(t) in a suspended –level viscometer recorded for

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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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Problem set 3 - Problem Set #3 POLYMERIC MATERIALS Due date...

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