What is weight average degree of polymerization?
What is weight average degree of polymerization?
The weight-average degree of polymerization is a weighted mean of the degrees of polymerization, weighted by the weight fractions (or the overall weight of the molecules) of the species. It is typically determined by measurements of Rayleigh light scattering by the polymer.
How do you find the average 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.
What is the average rate of polymerization?
What is average rate of polymerization? 2000 bp per second.
What is degree of polymerization?
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 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 determine the degree of polymerization of cellulose?
The degree of polymerization of cellulose is calculated from the intrinsic viscosity of solutions prepared by dissolving cellulose in a suitable solvent, such as CED or cadoxen.
How do you calculate average functionality?
Average, which is the arithmetic mean, and is calculated by adding a group of numbers and then dividing by the count of those numbers. For example, the average of 2, 3, 3, 5, 7, and 10 is 30 divided by 6, which is 5.
What is rate of polymerization of DNA polymerase 3?
coli, the DNA polymerase III holoenzyme synthesizes DNA at approximately 750 nucleotides per second, and can extend a DNA strand for several thousand nucleotides without dissociating from the template.
How do you calculate yield of polymerization?
Note: In a polymer reaction, the percent yield equals the mass of polymer formed (actual yield) divided by the mass of the monomers used (mass of starting material) (multiplied by 100).
What is degree of polymerization used for?
The degree of polymerization, or DP, is the number of repeat units in an average polymer chain at time t in a polymerization reaction. The length is in monomer units. The degree of polymerization is a measure of molecular weight. For most industrial purposes, lengths in the thousands or tens of thousands are desired.
What is degree of polymerization of polyester?
The degree of polymerization of polyester polymer is controlled, depending on its end-uses. Low molecular weight polyester polymer is spun at 265°C, whereas ultrahigh molecular weigh polyester polymer is spun at 300°C or above.
How is the weight-average degree of polymerization calculated?
The weight-average degree of polymerization is a weighted mean of the degrees of polymerization, weighted by the weight fractions (or the overall weight of the molecules) of the species.
What do crystallinity and polymerization of cotton fibers mean?
Crystallinity indicates that the fiber’s cellulose molecules are closely packed and parallel to one another. Higher degrees of polymerization and crystallinity of polymers are associated with higher strengths.
How is Cotton cellulose different from wood and rayon?
Cotton cellulose differs from wood and rayon cellulose by having higher degrees of polymerization and crystallinity. The degree of polymerization is the number of repeating units that are linked together to form a molecule of cellulose.
How are the properties of cotton related to their strength?
Higher degrees of polymerization and crystallinity of polymers are associated with higher strengths. Due to the increased degree of crystallinity and hydrogen bonding between the molecules in the crystalline areas in cotton, moisture can’t penetrate the molecules. Moisture penetrating molecules can act as a lubricant and result in loss of strength.