Abstract
Ethylene oxide and styrene oxide were sequentially polymerized to form the diblock copolymer E 17S 8 (E = oxyethylene, OCH 2CH 2; S = oxyphenylethylene, OCH 2CH(C 6H 5); subscripts denote number-average block lengths in repeat units). Light scattering was used to investigate the properties of the micelles formed in dilute solution in the temperature range 15–30 °C. The micelles are elongated (probably spheroidal) at the lower temperature and highly elongated (cylindrical, probably wormlike) at the higher temperature. Comparison with results reported for the copolymer E 11B 8 (B = oxybutylene, OCH 2CH(C 2H 5)) allowed exploration of the effect of changing the hydrophobic block. The results provide useful indicators toward the design of ES copolymers with optimal solubilization properties.
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