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

摘要: Because of the hydrophobic end blocks, micelles triblock BEB copolymers (E denotes an oxyethylene unit, B oxybutylene unit) formed in aqueous solution show effects attributable to intermicellar bridging. The formation mixed with a diblock EB copolymer reduces but does not eliminate effect. Light scattering methods applied dilute solutions have been used that this is case for B12E114B12 and E43B11 (the subscripts denote block lengths). This work focuses on 20 wt% effect mixing properties relating gel state, i.e. dynamic storage modulus (G′) yield strength (σy). There are two contributory factors determining properties: micelle bridging packing, just latter operative gel. Increasing proportion mixture contribution from Considering at 5 °C, temperature values G′ σy fall away monotonically zero. For 25 pass through minima as system changed 100% copolymer.