# Interpretation of chromatogram

1. Oct 16, 2014

### selseg

1.
In my polychemistry laboratory , the task was to determine the Number Average Molecular Weight and the Weight Average Molecular weight of two samples , one a polystyrene sample prepared by radical polymerization , and the other a polystyrene-block-isoprene polymer prepared by anionic polymerization.Using Gel Permeation Chromatography . The GPC software generated an elugram and a weight distribution for each sample.

2. Relevant equations
PDI = Mw/Mn

3. The attempt at a solution
The plot for the first sample is easy to inteprete since it has a broad distribution .The plot for the second has another small peak to the right of the main peak , which I understand is the Copolymer .However I dont understand how that peak came about in relation to synthesis and Molecular Weight

2. Oct 21, 2014