Prediction of melt state poly(alpha-olefin) rheological properties : the unsuspected role of the average molecular weight per backbone bond

Fetters, L. J.; Lohse, D. J.; Garcia-Franco, C. A.; Richter, D.; Brant, N. P. M.

doi:10.1021/ma025659z

Journal Article

Prediction of melt state poly(alpha-olefin) rheological properties : the unsuspected role of the average molecular weight per backbone bond

Fetters, L. J. ; Lohse, D. J. ; Garcia-Franco, C. A. ; Brant, N. P. M. ; Richter, D.FZJ*

2002
Soc. Washington, DC

Macromolecules 35, 10096 - 10101 (2002) [10.1021/ma025659z]

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Please use a persistent id in citations: http://hdl.handle.net/2128/1278 doi:10.1021/ma025659z

Abstract: It has previously been shown that the entanglement molecular weight (M-e) and the plateau modulus (G(N)(0)) of flexible polymers can be correlated to the unperturbed chain dimension, <R-2>(0)/M, chain density (rho) via the use of the packing length (rho), which is defined as the volume of a chain divided by its mean square end to end distance. For polyolefins and co-polyolefins where <R-2>(0)/M remains unmeasured a method is presented herein where knowledge of the average molecular weight per backbone bond (m(b)) allows G(N)(0) and thus M-e to be estimated. This is particularly valuable for the case of polyolefin copolymers where the melt chain dimensions (and thus the packing length) are unknown.

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