Effect of ethanol on the gelation of aqueous solutions of Pluronic F127

Micellization and gelation of PEO-PPO-PEO binary mixture with non-identical PPO block lengths in aqueous solution

“…4 shows the temperature ranges of sol and gel states of each sample based on the tube inversion method. Pure 25% F127 gels at 18 C, which is in good agreement with the literature [18,33]. An interesting observation is that samples with certain F127:L64 ratios form gel again (2nd gel) after the first gel melts.…”

“…Other than the existence of two gel regions, we also find that G 0 dominates over G 00 even in the region in between them, although the results are not shown. According to the literature, gels could be classified into hard gels (G 0 > 1000 Pa) and soft gels (G 0 < 1000 Pa) [18,33]. This soft gel goes undetected in the tube inversion technique due to its very small yield stress (<20Pa).…”

“…As reported in the literature, the Bragg reflections always tend to become very weak in lyotropic liquid crystalline phases such as those found in Pluronics [39] due to short range disorder in the structure. However, these reflections are sufficient to reveal the packing of micelles [33,39,40]. The SAXS spectra of pure 25% F127 and pure 25% L64 are shown in Fig.…”

The effect of plasticizers on the erosion and mechanical properties of polymeric films

“…Water causes disassociation of the hydrogen bonds linking the ether oxygens from the Pluronic F-127 to the carboxylic acid groups on CAP, leaving behind a material that contains increasing amounts of CAP relative to all of the other materials. Because CAP is a stronger polymer than Pluronic and the association polymer they form together, erosion actually increased the strength of the material [37, 38]. The ultimate tensile strength and elastic modulus increased since the polymer chains could not stretch and begin to slide past each other as easily as before incubation.…”

Molecular interactions and solubilization of structurally relatedmeso-porphyrin photosensitizers by amphiphilic block copolymers (Pluronics)

“…A 2 mM P123 sample shows the presence of $20 nm micelles ( Figure 4A), as also previously reported 21 . F127 shows a bimodal distribution ( Figure 4B) corresponding to the reported mixture of micelles at $30 nm and unimolecular micelles at $ 5 nm [22][23][24][25][26] . As plain aqueous Pluronic samples showed an increase of u upon increasing concentration ( Figure S5A), measurements 42 mM were only performed for P123, that exhibits a low increase in u ( Figure 3D) up to gelling point ($30 mM at 25 C 27 ).…”