Mark-Houwink equation

Mark-Houwink equation

[′märk ′hau̇‚wiŋk i‚kwā·zhən]
(physical chemistry)
The relationship between intrinsic viscosity and molecular weight for homogeneous linear polymers.
References in periodicals archive ?
The approximate molecular weight of all grades of synthesized PAM was calculated from intrinsic viscosity, [eta]], using the Mark-Houwink equation, [[eta]] = [KM.sup.[alpha]] .
Synthesized PAM molecular weight also has been determined by intrinsic viscosity measurement with the help of Mark-Houwink equation. Viscosity-average molecular weights of PAMs are shown in Table 1.
From the intrinsic viscosity, the molecular weight was determined employing the Mark-Houwink equation:
The Mark-Houwink equation for the linear polymers in the GPC solvent relates intrinsic viscosity to the viscosity average molecular weight ([M.sub.v]).
The solvent used for PEN was a 50/50 (v/v) mixture of phenol (>99%, Aldrich) and 1,2,4-trichlorobenzene (>99%, Aldrich); the viscosity measurements were made at 30[degrees]C, and the Mark-Houwink equation employed to calculate the number average molecular weight was derived from the data of Po et al.
(b) From the Mark-Houwink equation [[eta]] = 2.10 X [10.sup.-4] [M.sub.n.sup.0.82] [15].
CVh is the hydroxyl content of recycled PET, which is calculated from the Berkowitz equation, [M.sub.n] = 2,000,000/(CV + CVh) where CV is the carboxyl content; in this study it was measured to be equal to 52 eq./ton, [M.sub.n] for Post Consumer PET flakes was calculated as 33,630 g/mole according to the Mark-Houwink equation.
Some dilute solution properties of these polymers, such as the interaction with organic solvents (7), the Mark-Houwink equations in CH[Cl.sub.3] and DMF (8), and a [Theta]-solvent composition (9), were previously determined.