Micellisation and gelation of diblock copolymers of ethylene oxide and propylene oxide in aqueous solution, the effect of P-block length

Effects of block architecture and composition on the association properties of poly(oxyalkylene) copolymers in aqueous solution

“…9 were obtained 86) for 5 g N dm -3 aqueous eluents of copolymers E 104 P 60 and E 93 P 73 : the peaks correspond to unimers (at 17.5 cm 3 ) and micelles (at 12 cm 3 ). The temperature at which the micelle peak is first detected (i. e. 26 8C for the solution of E 104 P 60 ) is the cmt 54,85,86) .…”

“…The effect, which was first pointed out in discussing measurements of N for EPE block copolymers, is explored in some detail in ref. 7,86) Tab. 6.…”

Aqueous Gels of Diblock Oxyethylene‐Oxypropylene Copolymers

“…and molecular characterisation. [7] Purification was needed to remove the small proportion of homopoly(oxypropylene) produced by the transfer reaction in the oxyanionic polymerisation of propylene oxide under the conditions employed. [16] Gel permeation chromatography calibrated with poly(oxyethylene) standards was used to confirm narrow chain length distributions: i.e.…”

“…In a previous study of the micellisation and micelle properties of a series of E m P n copolymers (m % 100, n ¼ 37-73) in aqueous solution we defined only their hard gel boundaries. [7] In this paper we report aspects of the rheology of solutions of two of these copolymers, E 102 P 37 and E 92 P 55 . Recently we have described small-angle X-ray scattering (SAXS) experiments which show that aqueous gels of diblock E m P n copolymers closely related in composition to those of present interest comprise body-centred cubic (bcc) arrays of packed spherical micelles.…”

Association Properties of a Diblock Copolymer of Ethylene Oxide and Styrene Oxide in Aqueous Solution Studied by Light Scattering and Rheometry

“…association numbers of present and related block-copolymer micelles increase with temperature (see Table 2, also ref. [5,47] ). Considering a simple model of spherical micelles with anhydrous cores, the core radius increases as N 1/3 and the loss of conformational entropy related to stretching of a short hydrophobe block when N is large can destabilise spherical micelles in favour of cylindrical micelles.…”