Adsorption of Poly(4-vinyl pyridine) Unimers into Polystyrene-Block-Poly(acrylic acid) Micelles in Ethanol Due to Hydrogen Bonding

Abstract

The adsorption of poly(4-vinyl pyridine) (P4VP) unimers into spherical core-shell micelles self-assembled by polystyrene-block-poly(acrylic acid) in ethanol is studied by a combination of static light scattering (SLS) and dynamic light scattering (DLS). P4VP unimers with a coil size of ca. 7.9 nm can be first absorbed into the PS-b-PAA spherical core-shell micelles with a hydrodynamic diameter of 79.9 nm and then penetrate into the shell of the micelles to form hydrogen-bonded micelleunimers complexes in ethanol. During the adsorption, the hydrodynamic diameter and gyration radius of the micelle-unimers complexes decrease first and then stay almost unchanged when P4VP solution in ethanol is added into the PS-b-PAA micelle solution. It is also found that the structure of the micelleunimers complexes remains spherical but becomes smaller and denser than that of the PS-b-PAA micelles after absorption of P4VP unimers.

Nanometer‐Scaled Hollow Spherical Micelles with Hydrophilic Channels and the Controlled Release of Ibuprofen

“…[39] Curve A in Figure 1 shows the hydrodynamic diameter distribution of the resultant PS 53 -b-PAA 69 micelles. The diameters were about 125 nm, a little larger than common core-shell micelles.…”

“…The diameters were about 125 nm, a little larger than common core-shell micelles. [39] The reason may be that the core of the micelle was swollen by 1,2-dichloroethane. After removing the 1,2-dichlorethane, PS chains would shrink to form a compact or solid core, and the diameters of the micelles decreased to about 80 nm (curve B in Figure 1 micelles, the interaction between the PAA and P4VP chains appeared, which resulted in the formation of complex micelles with a PAA/P4VP complex layer and a mixed corona that contained both PNIPAM chains and PEG chains.…”

Characterization of the Spindle Morphology Nanomicelles Assembled from Sericin and Gelatin

“…Complex micelles core or shell was composed of two or more than two kinds of polymers (or polymers with small molecular compounds) by ionic bonding, hydrogen bonding, van der Waals force, and other intermolecular forces. The introduction of multicomponent provided complex micelles with more excellent properties and also increased the regulation performance [14][15][16][17][18][19][20]. Organic/organic, organic/metal, inorganic/organic, and biological/abiotic composites and nanocomposites with more sophisticated structure can be acquired by self-assembling of the complex micelles.…”

Aqueous Networks and Toroids of Amphiphilic Block Copolymer with Non‐ionic Surfactants

“…[8] Despite the great success in the design and synthesis of numerous new polymers that have fascinating assembling structures and properties, [8][9][10] supra-molecular assemblies [11] based on non-covalent interactions between different molecules have been attracting great research interest because of the unlimited possibilities to create and manipulate novel geometries and structures without the involvement of complicated chemistry. [12] Successful examples include the complexation of copolymers with small molecular surfactants, [13] low-molecular weight polymers with functional end groups, [14] and the inclusion of homopolymers in copolymers. [15] The widely utilized non-covalent interactions include hydrogen-bonding [16] and electrostatic interaction.…”

“…The P123 molecules may be shared by different PS-PEO spheres and thus assist the adhesive collision of the PS-PEO micelles in DMF/water mixture. The swelling of the PEO coronas by P123 increased the spacing between the PS- www.chemphyschem.org PEO chains, which allows the PS chains to relax a little from stretched conformations, [14] leading to a slight decrease in the average sphere diameter from 25.9 AE 1.7 nm (Figure 1 b) to 24.6 AE 2.3 nm (Figure 2 a) and 23.7 AE 2.1 nm (Figure 2 d). This P123-assisted adhesive collision in the DMF/water mixture plays a key role in the formation of sphere networks.…”