The electric field orientation of x-carrageenan in aqueous solution was investigated by the reversing-pulse electric birefringence method at 633 nm and 33°C. The observed field orientation was attributed to the fast-induced polarization of the counterions (K + ions) in the ionized polymer domain. Since the charge density parameter ~ of non-helical and elongated x-carrageenan is 0.66, the fast-induced ionic polarization is probably due to the counterions loosely bound by Debye-Hiickel type electrostatic forces, but not due to the condensed counterions.
Посилання на статтю:
Electric field orientation of sonicated x-carrageenan in aqueous solution: ionic polarization of loosely bound counterions / Kazuyoshi Ueda, Hiroshi Ochiai, Tomoyuki Itaya and Kiwamu Yamaoka // Polymer. – 1992. – Vol 33. – P. 429-431.