DOI: 10.1002/pol.1962.1205816603. The Newtonian melt viscosity of polyethylene: An index of long‐chain branching

The Newtonian melt viscosity of polyethylene: An index of long‐chain branching

10.1002/pol.1962.1205816603

Crossref journal-article

Wiley

Journal of Polymer Science (311)

Abstract

AbstractThe relationship at 190°C. between Newtonian melt viscosity η0 and the weight‐average molecular weight, M̄w for polyethylenes has been developed by use of melt viscosities obtained from capillary viscometry and molecular weights from intrinsic viscosity and bulk flow measurements in addition to the usual light‐scattering determinations. The same η0 vs. M̄w relationship is obeyed by whole and fractionated linear polyethylenes and also by ethylene–butene and ethylene–propylene copolymers. The Newtonian viscosity therefore seems virtually independent of molecular weight distribution and the influence of short (ethyl, methyl) chain branches. Low density polyethylenes have consistently lower Newtonian melt viscosities at given M̄w than their linear counterparts. At constant M̄w and temperature, therefore, η0 depends primarily on long‐chain branching. A viscosity index of long‐chain branching (v.b.i.) is defined by the ratio of Newtonian viscosities of a linear and a branched polyethylene of the same M̄w. The v.b.i. correlates well with an intrinsic viscosity branching index provided long branch incidence is high. The correlation breaks down otherwise, because the intrinsic viscosity is also sensitive to molecular weight distribution and the presence of short‐chain branches. The v.b.i. is therefore more useful as a long branching index. It is a comparative index, however, and not an absolute evaluation of the number of long branches per molecule. The η0 vs. M̄w relationship of linear polyethylenes does not obey the often reported 3.5 power law for linear polymers, but is well fitted by a 4.2 power factor. The present work indicates the necessity of using polyethylenes which have been stabilized against the effects of thermally induced changes if meaningful values of Newtonian viscosity are to be obtained.

Bibliography

Schreiber, H. P., & Bagley, E. B. (1962). The Newtonian melt viscosity of polyethylene: An index of longâchain branching. Journal of Polymer Science, 58(166), 29â48. Portico.

Authors 2

H. P. Schreiber (first)
E. B. Bagley (additional)

References 34 Referenced 61

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Marshall D. I. paper presented 130th Meeting American Chemical Society AtlanticCity N. J. September 1956.
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{'key': 'e_1_2_1_24_2', 'first-page': '218', 'volume': '60', 'author': 'Duch E.', 'year': '1956', 'journal-title': 'Z. Elektrochem.'} / Z. Elektrochem. by Duch E. (1956)
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Dates

Type	When
Created	22 years, 4 months ago (April 16, 2003, 10:02 a.m.)
Deposited	1 year, 10 months ago (Oct. 19, 2023, 9:55 a.m.)
Indexed	1 year, 9 months ago (Nov. 22, 2023, 9:20 p.m.)
Issued	63 years, 4 months ago (April 1, 1962)
Published	63 years, 4 months ago (April 1, 1962)
Published Online	22 years, 5 months ago (March 10, 2003)
Published Print	63 years, 4 months ago (April 1, 1962)

Funders 0

None

BibTeX

@article{Schreiber_1962, title={The Newtonian melt viscosity of polyethylene: An index of long‐chain branching}, volume={58}, ISSN={1542-6238}, url={http://dx.doi.org/10.1002/pol.1962.1205816603}, DOI={10.1002/pol.1962.1205816603}, number={166}, journal={Journal of Polymer Science}, publisher={Wiley}, author={Schreiber, H. P. and Bagley, E. B.}, year={1962}, month=apr, pages={29–48} }

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