In this section
@article{Lopez:2016:10.1021/acs.macromol.6b02261,
author = {Lopez, CG and Colby, RH and Graham, P and Cabral, JT},
doi = {10.1021/acs.macromol.6b02261},
journal = {Macromolecules},
pages = {332--338},
title = {Viscosity and Scaling of Semiflexible Polyelectrolyte NaCMC in Aqueous Salt Solutions},
url = {http://dx.doi.org/10.1021/acs.macromol.6b02261},
volume = {50},
year = {2016}
}
TY - JOUR
AB - We investigate the viscosity dependence on concentration and molecular weight of semiflexible polyelectrolyte sodium carboxymethylcellulose (NaCMC) in aqueous salt-free and NaCl solutions. Combining new measurements and extensive literature data, we establish relevant power laws and crossovers over a wide range of degree of polymerization (N) as well as polymer (c) and salt (cs) concentrations. In salt-free solution, the overlap concentration shows the expected c ∝ N–2 dependence, and the entanglement crossover scales as ce ∝ N–0.6±0.3, in strong disagreement with scaling theory for which ce ∝ c is expected, but matching the behavior found for flexible polyelectrolytes. A second crossover, to a steep concentration dependence for specific viscosity (ηsp ∝ c3.5±0.2), commonly assigned to the concentrated regime, is shown to follow c ∝ N–0.6±0.2 (with c/ce 6) which thus suggests instead a dynamic crossover, possibly related to entanglement. The scaling of c and ce in 0.01 and 0.1 M NaCl shows neutral polymer in good solvent behavior, characteristic of highly screened polyelectrolyte solutions. This unified scaling picture enables the estimation of viscosity of ubiquitous NaCMC solutions as a function of N, c, and cs and establishes the behavior expected for a range of semiflexible polyelectrolyte solutions.
AU - Lopez,CG
AU - Colby,RH
AU - Graham,P
AU - Cabral,JT
DO - 10.1021/acs.macromol.6b02261
EP - 338
PY - 2016///
SN - 0024-9297
SP - 332
TI - Viscosity and Scaling of Semiflexible Polyelectrolyte NaCMC in Aqueous Salt Solutions
T2 - Macromolecules
UR - http://dx.doi.org/10.1021/acs.macromol.6b02261
UR - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000391898000032&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR - http://hdl.handle.net/10044/1/49931
VL - 50
ER -