Self-diffusion study of poly (ethylene oxide)-poly (propylene oxide)-poly (ethylene oxide) block copolymers in aqueous solution

Influence of water-insoluble nonionic copolymer E6P39E6 on the microstructure and self-aggregation dynamics of aqueous SDS solution—NMR and SANS investigations

“…Such a dependence of R H on concentration-temperature was reported elsewhere. 43 For example, the R H,PPO obtained for mixed aggregates for SDS (B25 mM)-P2800 (0.72 mM)-D 2 O from the present diffusion analysis (Table 1) is about 27 Å and SANS modeling of data yielded prolate ellipsoidal mixed aggregates with typical dimensions a B 28 Å and b = c B 14 Å (see SANS analysis part). The above dimension/s is relatively lower as compared to previously reported R H value (46 Å) on SDS (25 mM)-P2800 (5 mM)-H 2 O system using DLS studies.…”

The Lyotropic Cubic Phase of Model Associative Polymers: Small-Angle X-Ray Scattering (SAXS), Differential Scanning Calorimetry (DSC), and Turbidity Measurements

“…Since there is an obvious resemblance of APs to di-and triblock copolymers, for example PS-butadiene (24), PS-PEP (25)(26)(27), and Pluronics (1,(28)(29)(30)(31)(32)(33) and inverted Pluronics (34), and to non-ionic surfactants of the type C x E y (35-37), we could suspect that our polymer The samples were characterized by size exclusion chromawould form similar solution structures, even though the pro-tography with THF as solvent. The chromatograms exhibit portion of the hydrophilic part of our APs generally is higher.…”

Micellization in aqueous solution of an ethylene oxide–propylene oxide triblock copolymer, investigated with 1H NMR spectroscopy, pulsed-field gradient NMR, and NMR relaxation

“…In addition, pulsed-field gradient spin-echo (PGSE) NMR and NMR relaxation techniques have also been applied to study the association behaviors of pluronic P105 in this work. It is known that the former technique is sensitive to large-scale motions, i.e., the overall translational motion of the unimers or the micelles in solution [23][24][25][26], while the latter technique has been demonstrated to be sensitive to the fast local motions in polymer chains [27][28][29]. Hence, the combination of 1 H NMR spectroscopy, PGSE NMR, and NMR relaxation techniques will give complete information of the effects of temperature and concentration on the microenvironment, large-scale motions, and segmental dynamics in each part of the block copolymer within the unimers, unimer-micelle transition, and micelle regions.…”