Weekly topic: 8 wealth points for those who answer correctly, 2 wealth points for participation； Question 83
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Why does an increase in temperature cause the viscosity of polymers to decrease? Temperature reflects the intensity of the random thermal motion of molecules. Increased temperature? Increased thermal motion of molecules? Increased distance between molecules? More energy leads to the formation of more \"holes\" within the material? This makes the chain segments more mobile? Reduced intermolecular interactions? Decreased viscosity
Because increasing the temperature enhances the thermal motion of the polymer macromolecules and the distance between molecules, thereby reducing the viscosity of the melt.
As the interaction parameters between polymer molecules and solvent molecules increase, rising temperature enhances the solvating capacity of the solvent; the macromolecules can expand fully in the solvent, and the space available for molecular movement decreases, which results in an increase in viscosity. An increase in temperature and an enhancement of the solvent’s solvating power for macromolecules are equivalent; both lead to an increase in the viscosity of the system.
Because an increase in temperature can lead to increased thermal motion of the polymer macromolecules and greater distances between molecules.
The decrease in viscosity is due to an increase in the interaction parameters between polymer molecules and solvent molecules. As the temperature rises, the solvating capacity of the solvent increases, allowing the macromolecules to expand fully within the solvent; as a result, the space available for molecular movement decreases, and thus the viscosity increases. An increase in temperature and an enhancement of the solvent’s solvating power for macromolecules are equivalent; both lead to an increase in the viscosity of the system.
Raising the temperature increases the thermal motion of the polymer macromolecules and the distance between molecules, thereby reducing its viscosity.
Why does an increase in temperature cause the viscosity of polymers to decrease? Answer: Temperature reflects the intensity of the random thermal motion of molecules. As the temperature rises, molecular thermal motion intensifies, the distance between molecules increases, and the additional energy leads to the formation of more \"holes\" within the material, making the chain segments more mobile. The intermolecular interactions decrease, resulting in a lower viscosity.
The decrease in viscosity is due to an increase in the interaction parameters between polymer molecules and solvent molecules. As the temperature rises, the solvating capacity of the solvent increases, allowing the macromolecules to expand fully within the solvent; as a result, the space available for molecular movement decreases, and thus the viscosity increases. An increase in temperature and an enhancement of the solvent’s solvating power for macromolecules are equivalent; both lead to an increase in the viscosity of the system.
Temperature reflects the intensity of the random thermal motion of molecules. Increased temperature? Increased thermal motion of molecules? Greater distance between molecules? More energy leads to the formation of more \"holes\" within the material, allowing the chain segments to move more easily and reducing the intermolecular interactions? The viscosity decreases.
Temperature reflects the intensity of the random thermal motion of molecules. Increased temperature? Increased thermal motion of molecules? Greater distance between molecules? More energy leads to the formation of more \"holes\" within the material, allowing the chain segments to move more easily and reducing the intermolecular interactions? The viscosity decreases.
The decrease in viscosity is due to an increase in the interaction parameters between polymer molecules and solvent molecules. As the temperature rises, the solvating capacity of the solvent increases, allowing the macromolecules to expand fully within the solvent; as a result, the space available for molecular movement decreases, and thus the viscosity drops.