Huggins’ constant

The formation mechanism of structure of the crosslinked copolymer in the presence of solvents described on the basis of the Flory-Huggins theory of polymer solutions has been considered by Dusek [1,2]. In accordance with the proposed thermodynamic model [3], the main factors affecting phase separation in the course of heterophase crosslinking polymerization are the thermodynamic quality of the solvent determined by Huggins constant x for the polymer-solvent system and the quantity of the crosslinking agent introduced (polyvinyl comonomers). The theory makes it possible to determine the critical degree of copolymerization at which phase separation takes place. The study of this phenomenon is complex also because the comonomers act as diluents. [Pg.4]

The intrinsic viscosity [ti] and Huggins constant Kjj were calculated according to Huggins equation (11). [Pg.681]

Sam- ple Nr Method for obtaining Polysaccharide yield g/L culture medium, g Polyuronides DE, PUAC, % % Molecular mass Intrinsic viscosity dlxg" Huggins constant Kh... [Pg.683]

The values of Huggins constant were close and indicated that there was an increased tendency towards aggregation for the dissolved macromolecules. [Pg.683]

Sam- ple Nr Kind of initial material for pectin extraction Extraction time min Yield of pectin, g per 200 g fresh material AUAC, % DE, % Molecul mass Mv Huggins constant Kh Intrinsic viscosity [ft] dl.g- Gel. strengtl TB... [Pg.943]

K is the Huggins constant which varies with the thermodynamical quality of the solvent ( salinity and temperature)... [Pg.121]

We have recently performed systematical measurements of the intrinsic viscosity of acrylamide-acrylic acid copolymers for large ranges of r and a, in the presence of CaCl2(26). Our results show that the empirical relation (14) can be extended to the case of divalent cations by using the value of 7 given in relation (15). It should then possible to predict the variation of intrinsic viscosity at infinite dilution, but at finite concentration the formation of aggregates makes difficult the determination of the Huggins constant. [Pg.123]

Figure2. Effect of calcium on intrinsic viscosity and Huggins constant of HPAM.

For each sample, the Flory Huggins constants (k, Eq. 5.25) were also determined (by viscosity measurements) as function of sonication time and are given in Tab. 5.17. [Pg.194]

From the slope and the intercept of the r ed versus c plot, calculate the Huggins constant, k. ... [Pg.138]

The Huggins constant k characterizes the first effects of interaction on the zero-shear viscosity ... [Pg.40]

Figure 11. Extension of the Gel Layer ((pgei) and Huggins Constant (x) of Phthalates in the Polymer, PVC-PVA.

T. Sakai, Huggins constant k for flexible chain polymers, J. Polym. Sci. PartA-2 6, 1535—1549 (1968). [Pg.67]

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