18. Below is the concentration dependence of the reduced viscosity (at 20°C) of the first fraction of the copolymer obtained from acrylonitrile and vinyl chloride with a ratio of components, respectively, 40:60 wt. % dissolved in dimethylformamide. Graphically find the intrinsic viscosity of the solution and calculate the molecular weight of the polymer:
Solution concentration С, kg/m3 1.25 2.5 4.5 6.5 8.5
Reduced viscosity, n/s 0.1235 0.1300 0.1405 0.1517 0.1640
Constants: a=1.35 and K= 4.94*10-8.

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