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Interpretation of chromatogram

  1. Oct 16, 2014 #1
    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

    This is the link to the plot https://docs.google.com/file/d/0Bw0SjzcEyj3GeTBIZ1NLanJuOWs/edit?pli=1 https://docs.google.com/file/d/0Bw0SjzcEyj3GeTBIZ1NLanJuOWs/edit?pli=1

    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. jcsd
  3. Oct 21, 2014 #2
    Thanks for the post! Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
     
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