Mark-Houwink Parameters for Aqueous-Soluble Polymers and Biopolymers at Various Temperatures

Martin Alberto Masuelli^1,

¹Laboratorio de Membranas, Instituto de Física Aplicada, CONICET, Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis, Chacabuco, San Luis, Argentina

Cite this paper:
Martin Alberto Masuelli. Mark-Houwink Parameters for Aqueous-Soluble Polymers and Biopolymers at Various Temperatures. Journal of Polymer and Biopolymer Physics Chemistry. 2014; 2(2):37-43. doi: 10.12691/jpbpc-2-2-2

Abstract

The intrinsic viscosity measurements used to calculate the Mark-Houwink (M-H) parameters are generally performed for different molecular weights at a constant temperature, with the standard value of this temperature being 25°C, or else 37°C in the case of mammalian proteins, or else under theta conditions for polymers and biopolymers. In the polymer industry, polysaccharides and proteins must circulate through pipes during transport processes where pumps have a very high-energy expenditure and where temperatures must be greatly increased, and at this point calculation of the Mark-Houwink parameters becomes important. The M-H parameters are calculated at standardized temperatures and in many cases, these are not useful because of the errors they carry, and it then becomes very difficult to calculate the molecular weight. It is therefore necessary to know the change in molecular weight as evidence of a change in the product obtained, as this may create a need to halt the production process, transport, or extrusion. The basic criterion is that the molecular weight does not change with temperature, or at least within one discrete range of temperatures, but that there is hydrodynamic change (intrinsic viscosity). The method is simple and requires iterative mathematical processing and measurement of intrinsic viscosity at different temperatures.

Keywords:
intrinsic viscosity macromolecules Mark-Houwink parameters temperature

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