Is possible to compare crystallinity % by XRD in i-PP (isotactic PP) materials without using a polymer reference? Results could be comparable between them just taking into account the differents areas under the curve? thanks so much in advance
Hello Marisa,
By performing XRD you can obtain the diffractogram (Intensity vs 2*theta) of the i-PP. The organize phase of the material will be addressed by sharp peaks. Then, extracting the area of the crystalline peaks and the area of the amorphous phase, you can compute the crystallinity degree by:
Crystallinity= Icrystal/(Icrystal+Iamorphous)
In any case, I would recommend you to use DSC for estimating the crystallinity degree. I believe this is a better suited technique for obtaining more accurate results.
I hope this help you out.
Regards,
Carlos Eloy Federico
You may want to check this related RG discussions: https://www.researchgate.net/post/How_I_can_determine_the_percent_crystallinity_of_the_sample_by_xrd_pattern https://www.researchgate.net/post/How_can_I_calculate_the_crystallinity_of_a_semi-crystalline_polymer_by_using_XRD
Thank you all very much for your comments. Regarding the questions suggested to me and your comments, my doubt is focus in how to remove the area of the amorphous phase without an internal standard (ref). Is possible to get an internal standard for isotactic PP easily?
Thanks again for your help.
you can calculate the crystallinity data of your sample, by using Pearson VII function.
for more details you can see this article:
D. Trache et al. Physicochemical properties of microcrystalline nitrocellulose from Alfa grass fibres and its thermal srability, J. Therm. Anal. Calorim. 2016, 124, 1485-1496.
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