What is K value of a polymer?
K – Value is a measure of degree of polymerization or number of monomers in PVC chain or molecular weight. Since the % of PVC in films and sheets is predominant, its K value plays a very important role. K – Value has effect on properties of PVC resin, processing as well as properties of product.
What is K value in viscosity?
K value (viscosity), is an empirical parameter closely related to intrinsic viscosity, often defined in slightly different ways in different industries to express viscosity based estimate of statistical molecular mass of polymeric material used particularly for PVC.
What does K value mean in statistics?
› k is the constant dependent on the hypothesized distribution of the sample mean, the sample size and the amount of confidence desired. › n is the number of observations in the sample. › Note that (standard deviation / √n) is the standard error of the mean and is. a measure of how good our estimate of the mean is.
What is K value formula?
K-value is defined as the equilibrium ratio of vapor to the liquid mole fraction of a component in a mixture [10]:(1) K i = y i x i where Ki, yi, and xi are respectively, the K-value of component i, vapor phase mole fraction of component i, and liquid phase mole fraction of component i.
What is K in chemistry temperature?
K is the symbol given to the equilibrium constant for a chemical reaction. The value of the equilibrium constant, K, for a given reaction is dependent on temperature.
What is K value in vapor liquid equilibrium?
DEFINITION. K values, also known as equilibrium ratios or distribution coefficients are ratios of the mole fraction in one phase to that in a different phase, and are functions of temperature and pressure (and composition as well in non-ideal systems).
What are the k-values assigned to PvP polymer grades?
The K-values assigned to various grades of PVP polymer representa function of the average molecular weight, the degree of polymerization and the intrinsic viscosity. The K-values are derivedfrom viscosity measurements and are calculated according toFikentscher’s formula: logη75K0 2 rel=1 + 1.5K+K
What is the k value of PvP?
The K value of PVP is actually the characteristic value related to the relative viscosity of PVP aqueous solution, and the viscosity is the physical quantity related to the molecular weight of polymer, so the K value can be used to characterize the average molecular weight of PVP.
What is the k value (viscosity)?
K value (viscosity), is an empirical parameter closely related to intrinsic viscosity, often defined in slightly different ways in different industries to express viscosity based estimate of statistical molecular mass of polymeric material used particularly for PVC. The most commonly used K value in Europe is the Fikentscher K value…
What is polymer molecular weight?
Polymer molecular weight is defined as a distribution rather than a specific number because polymerization occurs in such a way to produce different chain lengths. Weight average molecular weight (MW) and number average molecular weight ( MN) are two ways we can characterize the polymer molecular weight.