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Huggins' constant and unperturbed parameter of dilute polymer solutions
Author(s) -
Chee K. K.
Publication year - 1982
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.1982.070270524
Subject(s) - intrinsic viscosity , polystyrene , polymer , constant (computer programming) , vinyl acetate , degree of polymerization , polymer chemistry , thermodynamics , viscosity , materials science , polymerization , chemistry , physics , copolymer , composite material , computer science , programming language
A novel method developed to evaluate the unperturbed parameter K θ from the viscometric data of dilute polymer solutions can be considerably simplified by making the reasonable assumption that the Huggins' constant under theta conditions, k H θ , is equal to ½ for a number‐average degree of polymerization of over about 2000. Two linear equations are derived pertaining to the present analysis, one to deal with the experimental data, and the other specially to estimate the intrinsic viscosity [η]θ which corresponds to κ H θ . All calculations were done by the linear least‐squares method. The K θ was computed by the Mark–Houwink–Sakurada equation. It is shown that reliable results on K θ can be obtained for polystyrene and poly(vinyl acetate).