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20. Determine the molecular weight of ethylcellulose in toluene using the viscometric method data:
 
Concentration of solution C, kg / m 3 2.0 4.0 6.0 8.0 10.0
The reduced viscosity of the polymer solution
η beats / C
0.16 0.19 0.21 0.24 0.26
 
Constants: K = 1,18⋅10 -4, α = 0,67.
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Questions and problems from the manual:
"Laboratory Workshop on Colloid Chemistry" Nekrasov AP, Veretenchenko BA, Kharkov NTU "KhPI", 2004
"Characteristic properties of disperse systems" Nekrasov AP, Kharkov, 1996
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