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Mixed micelles of block copolymers of ethylene oxide and 1,2-butylene oxide. Solutions and gels of triblock BEB plus diblock EB copolymers studied by light scattering and rheology
Kelarakis, Antonis; Havredaki, Vasiliki; Yuan, Xue-Feng; Yang, Yung-Wei; Booth, Colin
J. Mater. Chem. FIELD Full Journal Title:Journal of Materials Chemistry. 2003;13(11):2779-2784.
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Abstract
Because of the hydrophobic end blocks, micelles of triblock BEB copolymers (E denotes an oxyethylene unit, B an oxybutylene unit) formed in aq. soln. show effects attributable to intermicellar bridging. The formation of mixed micelles with a diblock EB copolymer reduces but does not eliminate the effect. Light scattering methods applied to dil. solns. have been used to show that this is the case for mixed micelles of B12E114B12 and E43B11 (the subscripts denote block lengths). This work focuses on 20 wt% aq. solns. and on the effect of mixing on properties relating to the gel state, i.e. dynamic storage modulus (G') and yield strength (????y). There are two contributory factors detg. the gel properties: micelle bridging and micelle packing, with just the latter operative for a diblock gel. Increasing the proportion of diblock copolymer in the mixt. reduces the contribution from micelle bridging. Considering 20 wt% solns. at 5 ????C, the diblock copolymer soln. does not gel at this temp. and values of G' and ????y fall away monotonically to zero. For 20 wt% solns. at 25 ????C, the diblock copolymer soln. does gel at this temp. and values of G' and ????y pass through min. as the system is changed from 100% triblock to 100% diblock copolymer. [on SciFinder(R)]
Keyword(s)
Micelles; Polyoxyalkylenes Role: POF (Polymer in formulation), PRP (Properties), USES (Uses) (intermicellar bridging in mixed micelles of ethylene oxide-butylene oxide di- and triblock copolymers) ; Storage modulus; Yield strength (intermicellar bridging in mixed micelles of ethylene oxide-butylene oxide di- and triblock copolymers) ; oxirane ethyloxirane diblock triblock copolymer mixed micelle
Bibliographic metadata
- CAN 140:128925 36-7 Physical Properties of Synthetic High Polymers Journal 0959-9428 written in English 107628-12-6 (Oxirane-ethyloxirane block copolymer); 717909-83-6; 725717-79-3 Role: POF (Polymer in formulation), PRP (Properties), USES (Uses) (intermicellar bridging in mixed micelles of ethylene oxide-butylene oxide di- and triblock copolymers)