Viscosity Chain Linkage in Polyvinyl Alcohol

Intrinsic Viscosity Chain Linkage in Polyvinyl Alcohol 

While the basic chemical structure of a synthetic polymer is usually well understood, many physical properties depend on such characteristics as chain length, degree of chain branching, and molar mass, which are not easy to specify exactly in terms of a molecular formula. Moreover the macromolecules in a given sample are seldom uniform in chain length or molar mass (which for a linear polymer is proportional to chain length) thus the nature of the distribution of molar masses is another important characteristic. 

A polymer whose molecules are all of the same molar mass is said to be monodls-perse a polymer in which the molar masses vary from molecule to molecule is said to be polydisperse. Specimens that are approximately monodisperse can be prepared in some cases by fractionating a polydisperse polymer this fractionation is frequently done on the basis of solubility in various solvent mixtures. 

A characteristic of interest in connection with PVOH and PVAc is the consistency of orientation of monomer units along the chain. In the formula given above, it is assumed 

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Exp. 27 Intrinsic Viscosity Chain Linkage in Polyvinyl Alcohol 319... 

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