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Homework Help: WAXS - XRD, calculating the degree of crystalinity

  1. Jan 11, 2017 #1
    1. The problem statement, all variables and given/known data
    Hello, I have done WAXS measurement on 3 samples of PP(Polypropylene). These samples are from plates processed by hydraulic pressing, it is the exact same material and the only difference is in postprocessing.
    1st. Was immediately cooled in water
    2 nd. Was put into another hydraulic press for 5 hrs at 80 °C
    3 rd. Was put into dryer for 24 hrs at 140°C
    This should lead to the different degrees of crystalinity, which is to be examined from measured data.
    I have used program "PeakFit" to analyze, first i subtracted baseline and then created another baseline on 2nd derivation, (1st was linear) and substracted it also. After each subtraction area under curve changed, i used this to calculate degree of crystalinity with equation:

    X% crystalinity = (area of peaks / whole area)*100
    [area of peaks = area after 2nd baseline subtraction; whole area = area after 1st linear baseline substraction]
    I determined that the angle from 7° to 30° is relevant for my calculation

    This is graph showing measured data: XRD.png
    Blue is water
    Balck is hydraulic press
    Red is dryer
    Number behind X is crystalinity i have caculated.

    I will also upload *.ASC data files, because my question is "Have I done this right, can someone check after me?" I have a feeling that I have missed something.

    I know this can be also calculated in Origin, but i am completly lost in that program ( so far i can only make graphs in it ) so if someone would be kind enough to explain to me the calculation in it i would be thankful.

    2. Relevant equations

    3. The attempt at a solution

    Attached Files:

  2. jcsd
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