Mark-Houwink-Sakurada constant

The Mark-Houwink-Sakurada constants for PMMA resin are o = 0.73 and K = 1. X 10 Table 3.3 contains solvent viscosity versus concentration data. Find the intrinsic viscosity using both the specific and relative viscosities and the viscosity average molecular weight. 

L.Dq/u.Rq dimensionless number Mark-Houwink-Sakurada constant Axial diffusion coefficient... 

Mark-Houwink-Sakurada constant Mass transfer coefficient around gel Fractional reduction in diffusivity within gel pores resulting from frictional effects Solute distribution coefficient Solvent viscosity nth central moment Peak skewness nth leading moment Viscosity average molecular weight Number of theoretical plates Dimensionless number... 

Benoit and co-workers [18] proposed that the hydrodynamic volume, Vr which is proportional to the product of [17] and M, where [17] is the intrinsic viscosity of the polymer in the SEC eluent, may be used as the universal calibration parameter (Fig. 18.3). For linear polymers, interpretation in terms of molecular weight is straightforward. If the Mark-Houwink-Sakurada constants K and a are known, log [t7]M can be written log M1+ + log K, and VT can be directly related to M. The size-average molecular weight, Mz, is defined by this process ... 

Table 13. List of the Mark-Houwink-Sakurada constants, [ j] = K MV of linear macromolecules...

B. Assume that the GPC curve of Polymer A is that of a polydisperse linear poly-chloroprene with Mark-Houwink-Sakurada constants in THF at 30°C of K = 4.18 x 10 5 dl/g and a - 0.83. Calculate the weight and number molecular weight averages, the polydispersity and the intrinsic viscosity of this polychloroprene. 

Table 4.3 Values of Mark-Houwink-Sakurada Constants K and a) for Some Polymer-Solvent Systems...

TABLE 17.4 The Mark-Houwink-Sakurada Constants for Various Polymers in Selected Solvents... 

Simha, R., On the relation between the Mark-Houwink-Sakurada constants. Journal of Polymer Science Part B, Polymer Physics, 37(15), pp. 1947-1948 (1999). 

Beer M. U., Wood P. J., Weisz J. 1999. A simple and rapid method for evaluation of Mark-Houwink-Sakurada constants of linear random coil polysaccharides using molecular weight and intrinsic viscosity determined by high performance size exclusion chromatography Application to guar galactomannan. Carbohvdr. Polymers. 39, 377-380. 

Evans, JM. Gel permeation chromatography A guide to data interpretation. Polym. Eng. Sci. 1973,13 (6), 401. Zhongde, X. Minghsi, S. Hadjichristidis, N. Eetters, L. Method for gel permeation chromatography calibration and the evaluation of Mark-Houwink-sakurada constants. J. Macromolecules 1981,14 (5), 1591 1594. 

Estimate the Mark-Houwink-Sakurada constants from the data in Rgure 3.15. 

McCarthy KJ, Burkhardt CW, Parazak DP. Mark-Houwink-Sakurada constants and dilute solution behavior of heterodis-perse poly(acrylamide-co-sodium acrylate) in 0.5 M and 1M NaCl. J Appl Polym Sei 1987 33 1699-1714. 

Table 2 shows the Mark-Houwink-Sakurada constants reported thus far for HA under physiological conditions. As can be seen in the table, the... 

Condition Ar atmosphere [21]/[BF3-OEt2] =40 solvent, CH2CI2 [21] =0.5mol " The weight average molecular weight Mw,sec-malls, polydispersity Mw,sEC-MALLs/ fn,SEC-MALLS, intrinsic viscosity [rj], and Mark-Houwink-Sakurada constant a ([ ] = KMw,sec-malls ) were determined by SEC in THF equipped with MALLS and viscosity detectors. 

---