By Werner-Michael Kulicke
This laboratory guide deals transparent guidance and counsel for the sensible daily software of viscosimetry, in addition to delivering a accomplished significant other for the translation of viscosimetric info from uncomplicated to complicated polymer solutions.
Read or Download Viscosimetry of Polymers and Polyelectrolytes (Springer Laboratory) PDF
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Additional resources for Viscosimetry of Polymers and Polyelectrolytes (Springer Laboratory)
Sample text
7) only the determination of the running time is necessary. 37) In addition, for the evaluation of the relative viscosity q, (Eq. 9), only the determination of the running times of the pure solvent and the sample solution is necessary. '„,iu,„ln equals the density of the pure solvent p^j,™,, because of the very small polymer concentration q,: 1 •» " Ptolulion ' 'solution 'solution /}, = — = = 1» •» ' / \ . 38) 'uilvrnt For the determination of the intrinsic viscosity | q] of the particular polymer-solvent system, the specific viscosity q,p can be evaluated from the relative viscosity q, via Eq.
1). In a real polymer solvent system the state of an ideally dilute solution is never reached, even very dilute solutions have a finite amount of polymer. The second term in Eq. 1) captures these interactions between the single polymer coils in a not ideally dilute solution. When Eqs. 7) are inserted in Eq.
Aging effects in polymer solutions. Quotient of the time dependent viscosity of a polymer solution. r/„ and the viscosity of a freshly prepared solution, t o as a function of the time t. The viscosity can increase with time as shown for polyl vinyl alcohol) (PVA), or decrease as shown for poly(acrylamide) (PAAm) in aqueous solution. Changing the solvent to dimethylsuffoxide (DM50) or ethylene glycol (EG) can prevent the aging. Data from (30] 40 t/(d) agree that association and reformation of the polymer molecules via hydrogen bonds or the formation of microgels in the form of small crystalline regions induce this aging phenomenon.
