Premium
Viscosity–temperature relationships for linear and 12‐arm star polystyrenes in dilute solution
Author(s) -
Liouni Maria,
Touloupis Costas,
Hadjichristidis Nikos,
Mays Jimmy W.
Publication year - 1989
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.1989.070370920
Subject(s) - cyclohexane , polystyrene , branching (polymer chemistry) , solvent , benzene , toluene , polymer chemistry , polymer , thermodynamics , star (game theory) , viscosity , theta solvent , materials science , star polymer , chemistry , solvent effects , organic chemistry , copolymer , composite material , physics , mathematics , mathematical analysis
The actual viscosities (cP) of dilute solutions of linear and 12‐arm star polystyrenes were measured in benzene, a good solvent, and cyclohexane, a poor to moderate solvent, as a function of temperature. The equations of Moore, previously established for solutions of linear polymers, were also found to be valid for star polystyrenes. A branching parameter b was defined which is essentially the same as g ′ = [η] br /[η] 1 . The values of b found in benzene are close to the value of g ′ for 12‐arm star polystyrene in toluene, another thermodynamically good solvent. It thus appears that Moore's relationships have at least limited utility in studying branching in polymers.