What is PDI for polymers?

PDI of a polymer is calculated as the ratio of weight average by number average molecular weight.

What is PDI value?

PDI is basically a representation of the distribution of size populations within a given sample. The numerical value of PDI ranges from 0.0 (for a perfectly uniform sample with respect to the particle size) to 1.0 (for a highly polydisperse sample with multiple particle size populations).

What does PDI stand for in chemistry?

The dispersity (Đ), formerly the polydispersity index (PDI) or heterogeneity index, is a measure of the distribution of molecular mass in a given polymer sample.

What is PDI in nanotechnology?

PdI is defined as the standard deviation (σ) of the particle diameter distribution divided by the mean particle diameter. P d I = ( σ 2 a ) 2 . (3) PdI is used to estimate the average uniformity of a particle solution, and larger PdI values correspond to a larger size distribution in the particle sample.

What is polydispersity index PDI of a polymer sample?

PDI means polydispersity index. In polymer language this usually refers to ratio of weight average molecular weight (Mw) to number average (Mn) sometimes also called as molecular weight distribution. PDI is used to indicate distribution of polymer chain molecular weights in a given polymer.

What is PDI in zetasizer?

The polydispersity index (PDI) is a number calculated from a simple two parameter fit to the correlation data called a cumulants analysis. The Polydispersity index is dimensionless and scaled such that values smaller than 0.05 are rarely seen other than with latex standards.

What is PDI in particle size distribution?

What is PDI in DLS?

As it is a moments expansion it can produce a number of values, however only the first two terms are used in practice, a mean value for the size (Z-Average), and a width parameter known as the Polydispersity Index (PdI).

Why is polydispersity index important?

It is well-known that both average molecular weight and molecular weight distribution are the two key characteristics that determine properties of polymers and that polydispersity index (PDI) is used as a measure of the breadth of the molecular weight distribution.