after polymerization, a styrene substituent's NMR peak shift down by few tenths of Hz and broaden when this monomer ( styrene modified on the meta position) is homopolymerized. when this monomer is copolymerized with normal styrene ( styrene/modified styrene = 9/1), it still broaden but appears at the same position as it was before polymerization.
PS: i find nothing in the the literature and i'm talking about a substituent, not the polymer backbone.
thanks
The NMR substitution is dependent on many factors including steric bulk, charge, electron richness proximity, nature of the solvent, ring orientations specially for the aromatic rings, magnetism character induction, and hybridization's to say a FEW! You could check on them on the internet with proper search quote and given these clues, find answer to your problem, you just need to try! Another thing, here at the site, are many people both seniors and juniors and it would be better to use at least a proper slang like Folks rather than guys! The gals are also here so make your address gender neutral and believe in equality!! There are better words and better language! You should also try to discuss real problem rather than saying lets.............. Thank you.
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