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Estimation of the inherent friction factor per main‐chain friction unit of liquid low‐molecular‐weight unsaturated polyesters
Author(s) -
Kaštánek Alois,
Balcr Miroslav,
Bohdanecký Miloslav,
Lešek František,
Kitzler Jaroslav
Publication year - 1986
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.1986.070310603
Subject(s) - chain (unit) , polyester , friction factor , materials science , polymer , thermodynamics , viscosity , unit (ring theory) , polymer chemistry , composite material , mathematics , physics , astronomy , reynolds number , turbulence , mathematics education
The temperature dependence (at 323–443 K) of the zero‐shear viscosity η of about 30 nonfractionated samples of an unsaturated polyester (300 < M n < 1500) was analyzed and the parameters of the Vogel equation describing the η( T ) dependence were estimated. Their dependence on the molecular weight is discussed. The inherent friction factor per main‐chain friction unit, ξ o , has been evaluated for 15 < Z n < 70 (where Z n is the number‐average number of main‐chain friction units) and compared with the values available for other polymers.