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Characterization of branched polydisperse polymers. Influence of solvents on the branching parameters
Author(s) -
Dobkowski Zbigniew
Publication year - 1985
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1985.070300131
Subject(s) - branching (polymer chemistry) , polymer , radius of gyration , macromolecule , gyration , exponent , polymer chemistry , linear polymer , thermodynamics , chemistry , materials science , organic chemistry , physics , mathematics , geometry , biochemistry , linguistics , philosophy
The influence of solvents on the branching degrees G (the ratio of intrinsic viscosities) and g (the ratio of radii of gyration), and on the branching exponent b in equation G = g b has been estimated using the recently reported equations for branched polymers. The following relations have been found: G < ḡ 0 , ḡ x , = ḡ x 0 , and b > b 0 , where subscripts 0 and x denote the unperturbed (or theta) conditions and the type of average value for polydisperse polymers, respectively. Hence the expansion coefficients of branched and linear macromolecules are related by α η,br < α η,lin and α s br = α s ,lin .