Abstract
Solution properties of polycarboxylates obtained by periodate oxidation of scleroglucan, with different degrees of oxidation, have been studied as a function of pH. Viscosity, calorimetric, optical and chiro-optical measurements show that the two carboxylated samples with higher degrees of oxidation (S-1·0 and S-0·7) can assume an ordered conformation at low pH. On the contrary the sample characterized by a lower extent of oxidation (S-0·2) shows no conformational changes. Optical measurements suggest that this polymer would be in an ordered helical form in dilute aqueous solution.
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