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Accurate description of intrinsic viscosity changes under polymer degradation: Narrow schulz distributions
Author(s) -
Shyichuk A. V.
Publication year - 1995
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.1995.070581306
Subject(s) - dispersity , exponent , viscosity , intrinsic viscosity , molar mass distribution , thermodynamics , polymer , chemistry , materials science , polymer chemistry , analytical chemistry (journal) , physics , chromatography , organic chemistry , philosophy , linguistics
For the Shulz distributions with weight—polydispersity from 1.4 to 2.0, the following equation is correct: ln [η] = ln [η] 0 − a {ln P 0 + DD − ln[ P F − P 0 ) × exp(−1.2 × DD )]}. Here, P 0 and P F are viscosity–polydispersities of the initial molecular weight distribution (MWD) and the Flory distribution, respectively; a is the Mark–Houwink exponent; and DD = ln( M n 0 / M n ). For more narrow MWDs, the complicated equation is required: ln [η] = ln[η] 0 − a {ln P 0 + DD − ln[ P F − ( P F − P 0 × exp(−0.9 × DD − 0.28 × DD 2 )]}. The inaccuracy of these equations is less than 1.5%. © 1995 John Wiley & Sons, Inc.