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Sedimentation analysis of 1,4‐ cis ‐polybutadiene in a theta solvent, diethyl ketone at 10.3°C
Author(s) -
Abe Mitsuo,
Murakami Yuriko,
Fujita Hiroshi
Publication year - 1965
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.1965.070090717
Subject(s) - polybutadiene , dispersity , ketone , viscosity , limiting , solvent , intrinsic viscosity , polymer , polymer chemistry , sedimentation coefficient , thermodynamics , materials science , chemistry , analytical chemistry (journal) , organic chemistry , physics , copolymer , mechanical engineering , engineering , enzyme
A sedimentation and viscosity study of 1,4‐ cis ‐polybutadiene (having 95% 1,4‐ cis units) in a θ‐solvent diethyl ketone (DEK) at 10.3°C. is reported. The limiting sedimentation coefficient s o and the limiting viscosity number [η]θ of the monodisperse sample of this polymer in the given θ‐solvent as functions of its molecular weight M are derived from data on polydisperse fractions by application of the method described by Homma et al. The results are: s o = 0.530 × 10 −15 M 1/2 (in sec.) and [η]θ = 1.60 × 10 −3 M 1/2 (in dl./g.). Substitution of the experimental data into the well‐known Mandelkern‐Flory equation yields 1.74 × 10 6 for the familiar parameter Φ 1/3 P −1 , which is about 30% lower than the usually accepted value (2.5 × 10 6 ).