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Relationships between molecular weight, solution viscosity, and melt index for narrow distribution, high pressure polyethylene whole polymers. Fast M̄ n determinations
Author(s) -
Mortimer George A.,
Daues Greg W.,
Hamner William F.
Publication year - 1964
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.1964.070080223
Subject(s) - branching (polymer chemistry) , polyethylene , polymer , molar mass distribution , viscosity , polymer chemistry , materials science , thermodynamics , polymerization , intrinsic viscosity , long chain , chain (unit) , degree of polymerization , chemistry , polymer science , composite material , physics , astronomy
Melt and solution viscosity properties of laboratory‐prepared batch polymerized high pressure polyethylene have been found to correlate well with molecular weight. These polymers have narrow and nearly constant molecular weight distributions and contain essentially no long‐chain branches. Short‐chain branching was found to have little or no effect on the relationships. Polyethylene made in the same reactor having long‐chain branches had melt and solution viscosity properties which deviated seriously from these relationships. The deviations serve as a semiquantitative measure of long‐chain branching. When long‐chain branching is absent, the correlations serve as rapid methods of determining M̄ n for narrow‐distribution polymers.