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J. Matuszewska-Czerwik


Fractionation of polymers.

Part I. Fractionation of a styrene-methyl methacrylate

copolymer by the me­thod of separation between two liquid phases


Polimery 1980, No 2, 55



DOI: dx.doi.org/10.14314/polimery.1980.055

Summary

A method for fractionation of a styrene-methyl metha­crylate copolymer by separation between two liquid phases in two systems: 1) chloroform (solvent), ethyl alcohol+ethylene glycol (non-solvent), and 2) chloroform (solvent) acetonitrile+ethylene glycol (non-solvent), has been elabo­rated. The integral and differential curves of molecular weight distribution have been calculated for copolymers of initial monomer composition as 5:1 and 1:5 in the function of Intrinsic viscosity determined in chloroform and in toluene and in the function of Mn. The presence of two maxima in the differential curve for 1 : 5 styrene-methyl methacrylate copolymer fractionated in the system (2) has been stated.


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