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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.
31 sty 2017 · The degree of polymerization can be calculated by using the following relationship if a molecular weight of a polymer molecule is known. M= (DP) M 0 M is the molecular weight of the polymer, DP is the degree of polymerization and the M 0 is the formula weight of the repeating unit.
In step-growth polymerization, the Carothers equation (or Carothers' equation) gives the degree of polymerization, X n, for a given fractional monomer conversion, p. There are several versions of this equation, proposed by Wallace Carothers, who invented nylon in 1935.
12 wrz 2021 · For example, once we have the degree of polymerization, it is a simple step to calculate the approximate molecular weight. That's just the degree of polymerization times the molecular weight of the monomer; in other words, the number of monomers in the chain times the weight of each one.
This equation shows that a high monomer conversion is required to achieve a high degree of polymerization. For example, a monomer conversion, p , of 98% is required for X n = 50, and p = 99% is required for X n = 100.
The degree of polymerization (DP D P) in a polymer molecule is the number, n, of repeating units in the polymer chain. The molecular weight of a particular polymer molecule is a product of the degree of polymerization and the molecular weight of the repeating unit.
12 lip 2023 · There are two general types of polymerization reactions: addition polymerization and condensation polymerization. In addition polymerization, the monomers add to one another in such a way that the polymer contains all the atoms of the starting monomers.
