Association of a Triblock Ethylene Oxide (E) and Butylene Oxide (B) Copolymer (B12E260B12) in Aqueous Solution
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Abstract
The association behavior of a triblock ethylene oxide (E) and butylene oxide (B) copolymer with a very long middle E block (B12E260B12) in aqueous solution has been investigated by means of laser light scattering. The flower-like closed association behavior of BEB−type triblock copolymers in aqueous solution can be altered to form open, branched, associated structures because of the very long E blocks. The B12E260B12 triblock forms flower-like micelles in a closed association process with a critical micelle concentration of 0.056, 0.040, and 0.033 mg/mL even at fairly low temperatures of 10.0, 20.0, and 25.0 °C, respectively. At room temperature, B12E260B12 can form large secondary associated structures which coexist with the flower-like micelles at concentrations of only 1−2% (w/v). The secondary associates increase in both amount and size with increasing concentration and increasing temperature, producing a highly viscous fluid even for a 4% aqueous solution of B12E260B12.
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