Schizophrenic micellization of poly(ethylene oxide-b-methacrylic acid) induced by phosphate and calcium ions

作者：Guragain Sudhina; Bastakoti Bishnu P; Nakashima Kenichi^*

来源：Journal of Colloid and Interface Science, 2010, 350(1): 63-68.

DOI：10.1016/j.jcis.2010.06.007

• Schizophrenic
• Micelles
• Cloud point
• Polyethylene oxide
• Polymethacrylic acid
• Phosphate ions

Two distinct types of micelle structures have been successfully obtained from poly(ethylene oxide-b-methacrylic acid) (PEO-b-PMAA) in aqueous solutions: one with a PEO-core surrounded by a PMAA corona and the other with a PMAA-core surrounded by a PEO-corona. The PLO-core micelles were obtained by decreasing the cloud point of the PEO to room temperature by adding phosphate ions (PO(4)(3-)), and the PMAA-core micelles were obtained by reducing the solubility of the PMAA block by adding calcium ions (Ca(2+)). The reversibility between the PMAA-core and PEO-core micelles was also confirmed; (1) the transformation from the PMAA-core to PEO-core micelles was achieved by solubilizing the PMAA block by removing Ca(2+) with ethylenediaminetetraacetic acid followed by the addition of PO(4)(3-), and (2) the reverse transformation was carried out by removing PO(4)(3-) by dialysis followed by the addition of Ca(2+). The two types of micelles were characterized using various techniques such as turbidimetry, dynamic light scattering, scanning electron microscopy and electrophoretic light scattering.

• 出版日期2010-10-1