01670nas a2200241   4500008004100000022001400041245011000055210006900165260007700234300001400311490000800325520077800333653001601111653002301127653002401150653002001174653002401194100002501218700002201243700001701265700002301282856012301305       2008                        eng d  a1022-135200aIntrinsic viscosity of aqueous solutions of carboxymethyl guar in the presence and in the absence of salt0 aIntrinsic viscosity of aqueous solutions of carboxymethyl guar i  aPO BOX 10 11 61, D-69451 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcOCT  a2087-20930 v2093 a<p>Intrinsic viscosities were determined for solutions of CMG in pure water and 0.9 wt.-% aqueous NaCl. To avoid the 0/0-type extrapolation typical for Huggins plots, a new procedure was used. For CMG and pure water, this requires only two adjustable parameters: the specific hydrodynamic volume of the polymer in the limit of infinite dilution and a hydrodynamic interaction parameter. The intrinsic viscosity of CMG (no salt) at room temperature is 6 050 mL . g(-1); approximately half as large as that of Na-PSS of comparable molar mass. The ratio of the intrinsic viscosities with and without salt is approximate to 7 for CMG, as compared to &gt;100 for Na-PSS. The reasons 1:5 5 for the different behaviors of the two types of polyelectrolytes are being discussed.</p>10aBiopolymers10aCarboxymethyl guar10aintrinsic viscosity10apolyelectrolyte10asalt-free solutions1 aBadiger, Manohar, V.1 aGupta, Nivika, R.1 aEckelt, John1 aWolf, Bernhard, A.  uhttp://library.ncl.res.in/content/intrinsic-viscosity-aqueous-solutions-carboxymethyl-guar-presence-and-absence-salt-001674nas a2200169   4500008004100000022001400041245009600055210006900151260011000220300001600330490000600346520095900352100002001311700002501331700002301356856012501379       2015                        eng d  a2046-206900aPolyelectrolytes in dilute solution: viscometric access to coil dimensions and salt effects0 aPolyelectrolytes in dilute solution viscometric access to coil d  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAR  a27674-276810 v53 a<p>Copolymers of acrylamide (AM) and diallyldimethylammonium chloride (DADMAC), differing in molar masses M (52.3 to 227 kDa) and degrees of charging y (0.2 to 0.6), were studied with respect to their viscometric behavior in dilute aqueous solutions containing variable amounts of NaCl. Complementary measurements were performed on a Brookhaven 90 plus particle size analyzer. M dominates the intrinsic viscosities [eta]. For the viscometric interaction parameters B this is only true for large concentrations of extra salt. [eta] and B as a function of solvent salinity follow Boltzmann laws. Coil dimensions, determined either via dynamic light scattering or viscometry, agree well. For low salt contents of the solvent the radii decrease with rising polymer concentration, whereas they increase for high salt concentrations; at a characteristic salinity of the solvent they become independent. Zeta potentials grow from +20 to +40 mV as y goes up.</p>1 aSuresha, P., R.1 aBadiger, Manohar, V.1 aWolf, Bernhard, A.  uhttp://library.ncl.res.in/content/polyelectrolytes-dilute-solution-viscometric-access-coil-dimensions-and-salt-effects-0