Molecular viscosity average, definition

This equation can be rearranged to incorporate the definition of the viscosity average molecular weight [2] ... 

We first consider below the commonly used nomenclature for solution viscosity and then describe in later sections the definition and significance of viscosity average molecular weight (Mv) and the method of its determination from solution viscosity. 

Definition of terms relating to individual macromolecules, their assemblies, and dilute solution.This document includes the recommended definitions for molecular weight, molecular weight averages, distribution functions, radius of gyration, end-to-end-distance vector, the Flory-Huggins-Staverman theory, solution viscosity, scattering of radiation by polymers and polymer solutions, fractionation, separation techniques, and so on. The document on dispersity is an important extension of this recommendation. 

Chi-oxa monomer in phosphate buffer (0.01 M, pH 10.6) was incubated in the presence of chitinase Bacillus sp., 1 wt % for the monomer) for 50 h at 25 °C. As the reaction progressed, precipitation of the product synthetic chitin started, which was isolated in a quantitative yield. The (1 4) structure was definitely determined by CP/MAS solid C NMR spectroscopy. The viscosity-average molecular weight (My) of synthetic chitin was determined as a value higher than 10 according to the Mark-Houwink-Sakurada equation, [r]] = KNP, However, later the molecular weight value was evaluated as less than that value. For the synthesis of chitin, a monomer oxazoline de-... 

To obtain a rate constant for a reaction, a measure for the extent of reaction must be obtained. Usually, the molecular weight at any instant, or a property related to it such as intrinsic viscosity, Mooney viscosity, or plasticity, has been plotted versus time. These techniques, however, are not sufficiently definitive since they depend not only on the average molecular weight but also on molecular weight distribution which may change during mechanochemical reactions (see Section D.2 of this chapter). Researchers at NRPRA defined an efficiency of mastication as the ratio of the number... 

---