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Cellulose molecular weights determined by viscometry
Author(s) -
Evans Robert,
Wallis Adrian F. A.
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.1989.070370822
Subject(s) - viscometer , intrinsic viscosity , cellulose , degree of polymerization , tetrahydrofuran , viscosity , polymerization , polymer chemistry , degree (music) , materials science , chemistry , thermodynamics , analytical chemistry (journal) , chromatography , organic chemistry , physics , polymer , solvent , acoustics
The equation suggested in the standard method SCAN C15:62 for the estimation of the degree of polymerization (DP) of a cellulose sample from its intrinsic viscosity ([η]) in cupriethylenediamine hydroxide (cuene) solution, P 0.905 = 0.75 [η]/mL g −1 , where P is an indeterminate average DP, is incorrect. Although differences between the experimental results from several laboratories need to be resolved, a tentative replacement ( P V = 1.65 [η]) is suggested, based upon the pooled data and a conversion from the intrinsic viscosity of cellulose tricarbanilate (CTC) in tetrahydrofuran (THF) to that of cellulose in cuene. The treatment of statistical errors in Mark–Houwink–Sakurada parameters, and the nonlinearity of the log[η]−log P v correlation are discussed.