Reconciliation of the Molecular Weight Dependence of Diffusion and Viscosity in Entangled Polymers

by: Timothy P Lodge

Physical Review Letters, Vol. 83, No. 16. (18 October 1999), 3218.

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Abstract

New measurements of chain self-diffusion ( D ) in highly entangled hydrogenated polybutadiene solutions and melts indicate that D â¼ M -2.3Â±0.1 ; where M is the molecular weight. Although these results contradict the widespread belief that in melts D â¼ M -2.0 ; we demonstrate that in fact the literature data for seven different polymers are consistent with D â¼ M -2.28Â±0.05 . This result largely removes a recalcitrant discrepancy between the M exponents for D and the viscosity. Important implications for theoretical approaches are also noted.

@article{lodge99, abstract = {New measurements of chain self-diffusion ( D ) in highly entangled hydrogenated polybutadiene solutions and melts indicate that D \^{a}¼ M -2.3\^{A}±0.1 ; where M is the molecular weight. Although these results contradict the widespread belief that in melts D \^{a}¼ M -2.0 ; we demonstrate that in fact the literature data for seven different polymers are consistent with D \^{a}¼ M -2.28\^{A}±0.05 . This result largely removes a recalcitrant discrepancy between the M exponents for D and the viscosity. Important implications for theoretical approaches are also noted.}, author = {Lodge, Timothy P. }, citeulike-article-id = {808583}, doi = {10.1103/PhysRevLett.83.3218}, journal = {Physical Review Letters}, keywords = {diffusivity, experimental, polymer}, month = {October}, number = {16}, pages = {3218+}, posted-at = {2008-06-04 21:00:55}, priority = {2}, publisher = {American Physical Society}, title = {Reconciliation of the Molecular Weight Dependence of Diffusion and Viscosity in Entangled Polymers}, url = {http://dx.doi.org/10.1103/PhysRevLett.83.3218}, volume = {83}, year = {1999} }

RIS record

TY - JOUR ID - lodge99 L3 - citeulike-article-id:808583 TI - Reconciliation of the Molecular Weight Dependence of Diffusion and Viscosity in Entangled Polymers JF - Physical Review Letters VL - 83 IS - 16 SP - 3218 PB - American Physical Society N2 - New measurements of chain self-diffusion ( D ) in highly entangled hydrogenated polybutadiene solutions and melts indicate that D â¼ M -2.3Â±0.1 ; where M is the molecular weight. Although these results contradict the widespread belief that in melts D â¼ M -2.0 ; we demonstrate that in fact the literature data for seven different polymers are consistent with D â¼ M -2.28Â±0.05 . This result largely removes a recalcitrant discrepancy between the M exponents for D and the viscosity. Important implications for theoretical approaches are also noted. KW - diffusivity KW - experimental KW - polymer AU - Lodge, Timothy PY - 1999/10/18/ UR - http://dx.doi.org/10.1103/PhysRevLett.83.3218 ER -

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