STUDIES OF AGGREGATION IN DILUTE-SOLUTIONS OF THE TRIBLOCK COPOLYMER POE-POP-POE, SYNPERONIC F87 - II

H-1 NMR spectra were determined for D2O solutions of the triblock copo lymer Synperonic F87 as a function of temperature, over the range 4-44 degrees C. The data show that aggregation begins at a lower temperatu re than micellisation, involving primarily the methylene groups of the EO regions of the polymer and the methyl groups of the PO regions. Th e data further show that when the aggregates disappear at higher tempe ratures, leaving only micelles, the methylene groups of the PO regions , in particular, undergo a major change of state. (C) 1998 Elsevier Sc ience Ltd. All rights reserved.