The Effects of Salts and Ionic Surfactants on the Micellar Structure of Tri‐Block Copolymer PEO‐PPO‐PEO in Aqueous Solution

NMR investigations of self-aggregation characteristics of SDS in a model assembled tri-block copolymer solution

“…6. Earlier investigations on P123 in the presence of SDS indicated the possibility of secondary micelle formation of added SDS [49]. The present proton spin relaxation data combined with selfdiffusion studies corroborate the conjecture made by the interaction model related to mixed micelle formation [26,30,31].…”

“…It can be believed that the SDS-P123 mixed system acquires some charge (positive or negative) upon complex formation [49,50]. Furthermore, this mixed complex exhibits the screening effect in the sense that it repels positive or negative charges of the added SDS, consequently the excess SDS monomers cannot further associate with the polymer [49,50].…”

Block copolymer micellization induced microphase mass transfer: Partition of Pd(II), Pt(IV) and Rh(III) in three-liquid-phase systems of S201–EOPO–Na2SO4–H2O

“…The salting-out induced aggregation and micellization of EOPO molecules account for the microphase mass transfer of PtCl into separated EOPO phase. According to previous reports [24,[35][36][37], only small amount of oxygen atoms in C-O-C of PEO chain interacted with salt cations such as Na + or H + to form so-called pseudopolycations [38,46], which were capable of interacting with negatively charged PGMs species. Here, we call the oxygen atoms interacting with salt cations or H + activity sites.…”

“…The change in phase volumes of EOPO-Na 2 SO 4 ATPS can be attributed to the variation in microphase aggregation structure of block copolymer due to molecular hydration or dehydration, conformation change or transfer of water molecules across the interfaces [35][36][37][38]. The amphiphilic EOPO block copolymer molecules would spontaneously form micelles, a compact inner hydrophobic core constructed by PPO segments and a corona hydrophilic shell composed of PEO segments, with the increase in salt concentration in ambient aqueous solutions.…”

Polymer-Amphiphile Interactions: An Overview

“…Addition of salts to P123 and F127 solutions caused a linear decrease in cloud points, shifting of the micellization and micelle growth to lower temperatures. Both the surfactants (CPC and SDS) demicellized P123 as well as F127 [60]. Ali et al [53] studied the interaction among two homologous cationic gemini surfactants, bis(hexadecyldimethylammonium)hexane dibromide (16-6-16), bis(tetradecyldimethylammonium)hexane dibromide (14-6-14), and their corresponding conventional counterparts (CTAB and TTAB) with the nonionic polymer PVP to see the effect of hydrophobicity and molecular architecture.…”