How i can calculate Mw of polymer from NMR data?
What is the equation to calculate Mw for a block co-polymer synthezed by RAFT Polymerization?
Maybe from T1 / T2 relaxation to estimate correlation times. Or by DOSY for diffusion constants. Or NOE, if it lands near to the cross over between the small and large molecule regime.
If you have a distinguish end groups signals, then you can calculate the Mw by integrating end group signal and polymer signal.
@IKhlas Gadwal i donot have distinguish end group signals, as my end group and polymer chain end both contains Phenyl ring, so it create problem to calculate Mw.
@IKhlas Gadwal and Jonathan Hobley Thank you for you suggestions
Still need more help
If I understand correctly, your polymer spectrum has no end-group signals whatsoever that are distinguishable from the signals in the polymer chain, and you cannot determine the integral value per proton. You might want to check out "Universal Polymer Analysis by 1H NMR Using Complimentary Trimethylsilyl End Groups" by Michael Pach et al. in J. Am. Chem. Soc. 2010, 132 (25), pp 8757-8765. I believe that the authors are on Research Gate, but the full text of the paper is not yet available on RG. You can view the abstract of the paper on the Internet by typing the title of the paper into your Internet browser. I hope that this will help.
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