Respuesta :
The factors influencing the viscosity of a polymer solution are
- Size : The size represented (by a radius of gyration - average distance from the center of mass to outer coil edge ) increases as the repeating unit molar mass increased
- The viscosity is increased as more interactions will built in the solution
- The pure polymers do not dissolve in the solution but rather melt, transforming into a molten polymer state.
- The major interaction forces are intermolecular forces like H bond or dispersion forces. The stronger the forces between the individual chains, the lower the flow, and thus, the higher is viscosity.
The factors influencing viscosity of molten polymer
The pure molten polymers at low temperatures may form a polymer glass. Polymer glass –The polymer glass is a transition state between liquid and solid for a polymer, when the polymer chains are not completely crystallized.
- a) The viscosity of a polymer solution is higher as the repeated unit molar mass is higher.
- b) The viscosity of a molten polymer is lower as the strength of the intermolecular attraction forces (like H bond or dispersion forces) is enhanced.
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