How do you calculate the weight of a degree of polymerization?
Divide the molecular weight of the polymer by the molecular weight of the monomer unit to calculate the degree of polymerization. If the molecular mass of tetrafluoroethylene is 120,000, its degree of polymerization is 120,000 / 100 = 1,200.
How is degree of polymerization measured?
The degree of polymerization (DP or Xn) is defined as the number of monomer units in the polymer. It is calculated as the ratio of molecular weight of a polymer and molecular weight of the repeat unit. Number average DP and weight average DP are the two main types used for measuring the DP.
What is the average rate of polymerization?
What is average rate of polymerization? 2000 bp per second.
Which method is used to determine the average molecular weight of the polymer?
Gel permeation chromatography is used to determine the number average molecular weight, weight average molecular weight, and polydispersity. Polymers like simple molecules can dissolve in common solvents.
What is weight average molecular weight?
2.4. Weight average molecular weight (Mw) measuring system includes the mass of individual chains, which contributes to the overall molecular weight of the polymer. It is based on the fact that bigger molecules contain more mass than smaller molecules.
How do you calculate average molecular weight?
To get the number average molecular weight you divide the total weight of the sample by the total number of the molecules.
How do you find average molecular weight?
What is number average degree of polymerization?
The number-average degree of polymerization is a weighted mean of the degrees of polymerization of polymer species, weighted by the mole fractions (or the number of molecules) of the species. It is typically determined by measurements of the osmotic pressure of the polymer.
What is the average molecular weight of air?
As an example, the average molar mass of dry air is 28.97 g/mol.
What is the weight average molecular weight?
The number average molecular weight is the total weight of the sample divided by the number of molecules in the sample. This means that you multiply the weight of the molecule by the number of molecules of that weight.
Why weight average molecular weight is greater than number average molecular weight?
More importantly, the weight average molecular weight is always greater than the weight average molecular weight since larger molecules in a sample weigh more than smaller molecules.
What is the weight of air?
Air refers to the Earth’s atmosphere, which is about 300 miles thick and weighs 5 quadrillion tons. Air has mass, and anything with mass has weight. Air is a light substance, and 1 cubic foot of air is estimated to weigh 0.0807 pounds.
How is the degree of polymerization ( DP ) measured?
The degree of polymerization (DP or Xn) is defined as the number of monomer units in the polymer. It is calculated as the ratio of molecular weight of a polymer and molecular weight of the repeat unit. Number average DP and weight average DP are the two main types used for measuring the DP.
How to calculate the average molecular weight of a polymer?
Formula to Calculate Weight Average Molecular Weight The weight average molecular weight can be determined by, Mw= Σ fi Mi fi is the weight fraction of the polymer chains, and Mi is again the mean molecular weight of each range.
How is degree of polymerization of chain growth determined?
The degree of polymerization of chain-growth polymerization, cannot be calculated by Carothers. At the beginning of the reaction, long chains are formed and longer reaction times have little effect on the average molecular weight it only increases the polymer yield.
How does the degree of polymerization affect mechanical strength?
In general, increasing degree of polymerization correlates with higher melting temperature and higher mechanical strength. Synthetic polymers invariably consist of a mixture of macromolecular species with different degrees of polymerization and therefore of different molecular weights.