Micellar Structure of Amphiphilic Statistical Copolymers Bearing Dodecyl Hydrophobes in Aqueous Media

Abstract

The structure of micellar aggregates formed from ionic statistical copolymers of N-acryloyl-amino acids and N-dodecylmethacrylamide in 0.05 M aqueous NaCl was studied by light scattering and fluorescence. The experimental results indicated that the tendency of the interchain aggregation increased with the hydrophobic monomer content for each series of the copolymers but decreased with hydrophobicity of the amino acid residue in the copolymers. On the other hand, while the micellar structure of the statistical copolymers strongly depended on the kind of the hydrophobe, it is little dependent on the kind of the electrolyte monomer unit at low ionic strength. Using these data, a theoretical analysis taking into account the chain stiffness effect revealed that unicore micelles formed from the ionic statistical copolymers were of flower type with a minimum loop size.

Hierarchical Structures in Amphiphilic Random Copolymer Solutions

“…Values of α slow were very close to the critical [= 1/(f − 1)]. The aggregation number m w,slow was 860 at c = 0.0082 g/cm 3 and 6070 at c = 0.0628 g/cm 3 .…”

“…1) Among those copolymers, amphiphilic random or statistical copolymers, which may be regarded as a primitive model of proteins, are difficult to find their conformations fulfilling the requirements of both monomer units, so that they may take some frustrated conformations in aqueous medium. Recently, we 2), 3) have found that those copolymers form flower-like micelles with a uni-core or multi-cores in dilute aqueous solutions and not all hydrophobic groups attaching the copolymer chain are included in the micelle core(s). The hydrophobic groups outside the core may induce higher-order association of the flower micelles at higher micellar concentration.…”

Macromolecular Recognition: Interaction of Cyclodextrins with an Alternating Copolymer of Sodium Maleate and Dodecyl Vinyl Ether

“…It is likely that the polymer main chain adopts a folded conformation. [8] The interaction of a-, b-, and g-CDs with pC 12 MA was investigated by 1 H NMR spectroscopy under basic conditions (pD % 9.7). Figure 1 shows an example of 1 H NMR spectra for pC 12 MA in the absence and presence of CDs.…”

Hydrophobically Modified Sulfonated Polyacrylamides for IOR: Correlations between Associative Behavior and Injectivity in the Diluted Regime

“…Various techniques have been implemented among which viscosimetry [4][5][6][7][8][9][10][11][12], fluorescence [13][14][15][16], transmission, scanning and environmental scanning electron microscopy (TEM, SEM and ESEM) [16][17][18], 19 F NMR spectroscopy [19,20], neutron scattering [21][22][23][24] and Static and Dynamic Light Scattering (SLS and DLS) [14][15][16][25][26][27][28][29][30][31][32][33][34][35][36][37]. Theoretical approaches have also been proposed to describe HMWSP static [38,39] and dynamic [40] properties.…”