Chemical composition distribution of a graft copolymer prepared from macromonomer: fractionation in demixing solvents

A graft copolymer prepared by radical copolymerization of poly(dimethylsiloxane) macromonomer with methyl methacrylate has been characterized by light scattering and osmometry. The number- and weight-average molecular weights of the whole copolymer, its backbone, and the graft part were determined....

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Bibliographic Details
Published in:Macromolecules 1989-03, Vol.22 (2), p.861-865
Main Authors: Stejskal, Jaroslav, Strakova, Dagmar, Kratochvil, Pavel, Smith, Steven D, McGrath, James E
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Inorganic and organomineral polymers
Physicochemistry of polymers
Properties and characterization
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Summary:A graft copolymer prepared by radical copolymerization of poly(dimethylsiloxane) macromonomer with methyl methacrylate has been characterized by light scattering and osmometry. The number- and weight-average molecular weights of the whole copolymer, its backbone, and the graft part were determined. Copolymer macromolecules contain five grafts on an average. The copolymer was fractionated in a demixing solvent pair dimethyl sulfoxide--tetrachloroethylene. Fractions differing up to 24 wt.% in methyl methacrylate unit content were obtained. The advantages of this novel method of fractionation are discussed. The integral distribution of chemical composition evaluated from the fractionation data agrees well with the theoretical prediction. 17 ref.--AA
ISSN:0024-9297
1520-5835
DOI:10.1021/ma00192a058