Physicochemical Investigation of the Micellar Behavior of a Diblock (PEO)₆₂-b-(PBO)₃₃Copolymer in Water and its Interaction with Ionic Surfactants

Abstract

The physicochemical investigations on the associative, micellar and thermodynamic properties of a diblock (PEO) 62 -b-(PBO) 33 copolymer in aqueous medium and its interaction with ionic surfactants were carried out by using surface tensiometry, laser light scattering and steady-state fluorescence spectroscopy. Surface tension and fluorescence measurements were used to find out the critical micelle concentration (CMC) and related thermodynamic parameters of micellization copolymer at various temperatures. The data from dynamic light scattering (DLS) was helpful to obtain the values of hydrodynamic radii (R h ), volume ( h ) and hydrodynamic expansion parameter ( h ) of the copolymer micelle. Likewise, the measurements from static light scattering (SLS) were employed to determine weight-average molar (M w ), association number (N w ), thermodynamic radius (R t ), thermodynamic volume ( t ), anhydrous volume ( a ) and thermodynamic expansion parameter ( t ) of the copolymer micelles in the temperature range of 20-50 o C. Similarly, the interactions between (PEO) 62 -b-(PBO) 33 and two ionic surfactants, sodium dodecyl sulphate (SDS) and hexadecyltrimethylammonium bromide (CTAB), have also been investigated by fluorescence spectroscopy and DLS at 30 o C. Downloaded by [FU Berlin] at 05:19 07 July 2015 2Similarly, the interactions between (PEO) 62 -b-(PBO) 33 and two ionic surfactants, sodium dodecyl sulfate (SDS) and hexadecyl trimethylammonium bromide (CTAB), have also been investigated by fluorescence spectroscopy and DLS in detail.Graphical Abstract:

Dependency of Anion and Chain Length of Imidazolium Based Ionic Liquid on Micellization of the Block Copolymer F127 in Aqueous Solution: An Experimental Deep Insight

“…A large number of these applications are concerned with the formation of micelles and hence, micellization of block copolymer has generated substantial interest in the literature [ 7 ]. The interaction along with the aggregation behavior of mixed surfactants in solution and at interfaces has been rigorously investigated using various techniques such as small angle neutron scattering (SANS), dynamic light scattering (DLS), fluorescence, surface tension, viscosity, conductivity, and cyclic voltammeter [ 8 , 9 , 10 , 11 , 12 ]. As Pluronics ® are often employed in complex environments, for instance, in presence of other additives or amphiphile, studies on their effect on solution behavior of copolymers can help to optimize properties based on performance for various applications.…”

Physicochemical parameters and modes of interaction associated with the micelle formation of a mixture of tetradecyltrimethylammonium bromide and cefixime trihydrate: effects of hydrotropes and temperature

“…The observed positive Δ S 0 m values for TTAB + CMT accumulation may be explained by two issues. The first one involves the demolishing of iceberg configurations by moving the hydrated hydrophobic portion into the micellar core 37 of a TTAB + CMT combination. Another factor is that, in contrast to the aqueous surroundings, the degree of rotational flexibility of hydrophobic parts rises in the micellar interior.…”

“…and surfactants occurred which signicantly modied the aggregation character of the surfactants. [34][35][36][37][38][39] Measurement of conductivity, [34][35][36] surface tension, [36][37][38] light scattering techniques, 35,37,38 steady-state uorescence spectroscopy, 36,37 simple and differential UV/visible spectroscopic studies, 39 and small-angle neutron scattering (SANS) 40 methods were used to evaluate the physicochemical features of the aggregation process of the solutes-surfactant system. In the literature, several studies have revealed the mode of interaction of surfactants and HTs, emphasizing the widespread applications in antibacterial medicines.…”