What are the factors affecting the molecular weight of a polymer?

What are the factors affecting the molecular weight of a polymer? Low Molecular Weight polymers have lower properties due to lack of chain entanglement and higher molecular mobility. Shorter chains have more end groups which increase free volume and molecular mobility which makes it easier for the polymer chains to respond to stresses.

What are the factors affecting a polymers properties? The processing conditions which can affect the properties of the polymer include the temperature and pressure used during the polymerization, the solvent in which the polymer is polymerized, the types of monomer units used, the concentration of monomers in the reaction, the reagent which is used to initiate the

How does molecular weight affect properties of polymers? The lower the molecular weight, lower the transition temperature, viscosity, and the mechanical properties. Due to increased entanglement of chains with increased molecular weight, the polymer gets higher viscosity in molten state, which makes the processing of polymer difficult.

What does molecular weight depend on? The weight average molecular weight depends not only on the number of molecules present, but also on the weight of each molecule.

What are the factors affecting the molecular weight of a polymer? – Additional Questions

How do you increase the molecular weight of a polymer?

Cross-linking can be thought of as reducing the number of chain ends and, effectively, increasing the molecular weight of a polymer system [61]. In general, cross-linking will increase the strength of material [62].

Does temperature affect molecular weight?

In a number of cases the molecular size parameters have been found to depend on the solution temperature. When observed, the temperature dependence can change molecular weight values by as much as 50%.

Does molecular weight change with temperature and pressure?

1 Answer. Well, molar mass is a constant and independent of temperature and pressure.

How is diffusion affect by molecular weight?

Mass of the molecules diffusing: Heavier molecules move more slowly; therefore, they diffuse more slowly.

What is the relationship between molecular weight and rate of molecular movement?

Graham’s law states that the rate of diffusion or of effusion of a gas is inversely proportional to the square root of its molecular weight.

How do you determine the molecular weight of a molecule?

Sample Molecular Weight Calculation

Using the periodic table of the elements to find atomic weights, we find that hydrogen has an atomic weight of 1, and oxygen’s is 16. In order to calculate the molecular weight of one water molecule, we add the contributions from each atom; that is, 2(1) + 1(16) = 18 grams/mole.

How does molecular weight relate to the size of a molecule?

Molecular weight is the mass of an individual molecule, specifically the mass of material required to make a single mole. Molecular size relates to the physical size of an individual molecule. When used in light scattering techniques we refer to the ‘radius of gyration’ or Rg. Measurements are in nanometers.

Does state of matter affect molar mass?

The molar mass of an element or compound has a lot to do with determining its possible state of matter (solid, liquid, gas) generally as the molar mass of a substance increases then it gets more and more dense. As the density increases it is more likely to be in the solid state.

Does molar mass change with state?

No, not at all. Molar mass (MM) is simply the mass of 1 mole of the substance. During a phase transition no matter is neither created nor destroyed, so the MM doesn’t change.

What is the difference between molar mass and molecular weight?

Moreover, the main difference between both is that molar mass gives the mass of a mole of a particular substance. Whereas molecular weight is the mass of a molecule of a particular substance. While the definition and units are different for molar mass and molecular weight, the value is the same.

What is the difference between molecular mass and molecular weight?

The molecular mass (m) is the mass of a given molecule: it is measured in daltons (Da or u). Molecular weight, as a synonym of molar mass, is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles (g/mol).

What is difference between molar mass and molecular mass?

Molar mass is generally defined as the mass of Avogadro number of atoms, molecules or compounds while molecular mass is defined as the sum of atomic masses of all the atoms which are present in the given molecule or compound.

What is the unit of molecular weight?

The molecular weight is the mass of one mole of a substance. Usually, the units used for this are grams per mole.

What is molecular weight explain with example?

The sum of the atomic masses of all atoms in a molecule, based on a scale in which the atomic masses of hydrogen, carbon, nitrogen, and oxygen are 1, 12, 14, and 16, respectively. For example, the molecular weight of water, which has two atoms of hydrogen and one atom of oxygen, is 18 (i.e., 2 + 16).

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