1. Purpose of the experiment
Purpose of the experiment
Chromatography is skill for separating mixed matter. We got three unconfirmed samples. We want to know how many kinds of polymers are in the sample and molecular weight of each polymer.
Gel permeation chromatography (GPC) is a type of size exclusion chromatography (SEC), that separates analytes on the basis of size. The technique is often used for the analysis of polymers. We can investigate whole molar mass distribution.
In physical and organic chemistry, the dispersity is a measure of the heterogeneity of sizes of molecules or particles in a mixture. PDI is represented by the symbol Đ and calculated using the equation Đ = Mm/Mn, where Mm is the mass-average molar mass and Mn is the number-average molar mass
Definitions of molecular weight of polymer
Because polymer does not have specific molar mass, we can calculate the molar mass in several way. There are the number average molecular weight