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Polyelectrolyte properties in solution - shielding effect; HELP PLEASE

Hi, Could someone explain me the chemistry behind the polyelectrolyte dependence on solution. In my case,NaOH was added to PAA polymer, which implies that the ionic concentration/strength increases. And eventually, the size of polymer increases.. I don't know how to explain this results in terms of shielding effects and electrostatic interactions.

Please, any help is greatly appreciated! You will save my life for tomorrow! :smile:
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any ideas? :confused:

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