Temperature Dependence of the Structure and Interaction of Starlike PEG-Based Block Copolymer Micelles

Sommer, Cornelia; Pedersen, Jan Skov

doi:10.1021/ma0357669

Cited by 20 publications

(32 citation statements)

References 25 publications

(54 reference statements)

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“…The rescaled ρ corona ( r ) represents the volume fraction of the corona chains attached to the core surface, and is displayed in Figure 7 for 0.5 wt % C3Ms of A + S, A + C, G + S, and G + C in an aqueous solution. For all C3Ms, the maximum volume fraction of the corona chain is below 0.08, which is significantly lower than traditional block copolymer micelles [58,67,68,69]. The decrease in the maximum of the volume fraction also reflects the dilution of the corona because of the core swelling.…”

Section: Resultsmentioning

confidence: 83%

Effect of Ionic Group on the Complex Coacervate Core Micelle Structure

et al. 2019

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Pairs of ionic group dependence of the structure of a complex coacervate core micelle (C3M) in an aqueous solution was investigated using DLS, cryo-TEM, and SANS with a contrast matching technique and a detailed model analysis. Block copolyelectrolytes were prepared by introducing an ionic group (i.e., ammonium, guanidinium, carboxylate, and sulfonate) to poly(ethylene oxide-b-allyl glycidyl ether) (NPEO = 227 and NPAGE = 52), and C3Ms were formed by simple mixing of two oppositely-charged block copolyelectrolyte solutions with the exactly same degree of polymerization. All four C3Ms are spherical with narrow distribution of micelle dimension, and the cores are significantly swollen by water, resulting in relatively low brush density of PEO chains on the core surface. With the pair of strong polyelectrolytes, core radius and aggregation number increases, which reflects that the formation of complex coacervates are significantly sensitive to the pairs of ionic groups rather than simple charge pairing.

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Section: Resultsmentioning

confidence: 83%

Effect of Ionic Group on the Complex Coacervate Core Micelle Structure

et al. 2019

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“…1͑b͔͒, the resulting core-shell architecture of the scattering particle has to be taken into account, and the radial density profile of the droplets cannot be described solely by the scattering length density distribution of the surfactant film as before in the previous paragraph. Models that describe such core-shell density profiles have been applied to interpret SANS data from, e.g., polymer-decorated oil-in-water microemulsion droplets, 47,48 block copolymer micelles, [49][50][51][52] and other colloidal particles, e.g., PS-PNiPAM microgels. 53,54 In this work, we assumed a homogeneous composition for the water core of the microemulsion droplets with radius R. Thus, the radial density distribution function of the droplet core can be modeled by a step function that defines a constant density for distances 0 ഛ r ഛ R and zero density elsewhere ͓see Fig.…”

Section: B Model Of the Microemulsion Droplet With Diffuse Interfacementioning

confidence: 99%

Small-angle neutron scattering from giant water-in-oil microemulsion droplets. I. Ternary system

Foster

Sottmann²,

Schweins³

et al. 2008

The Journal of Chemical Physics

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To investigate the kinetics of biochemical transformations in confined environments, compartments with a radius of the order of 10-50 nm are needed. Giant water-in-oil microemulsions provide such nanoscale reaction compartments and allow furthermore to control the degree of compartmentalization by an external tuning parameter such as temperature. With this motivation we investigated the phase behavior and the microstructure of oil-rich microemulsions. In this approach we focused on oil-rich microemulsions of the ternary system D(2)O-cyclohexane(d12)-C(12)E(6). Measurements of the phase behavior revealed that up to 20 wt % of water can be solubilized by less than 3 wt % of surfactant. Small-angle neutron scattering experiments were performed to determine the length scales and microstructure topologies of the oil-rich microemulsions. To analyze the scattering data, we derived the form factor for polydisperse spherical Gaussian shells with a scattering contribution of the droplet core. The quantitative analysis of the scattering data with this form factor shows that the radius of the largest droplets amounts up to 36 nm.

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“…One key effect of solvent selectivity (or equivalently, temperature) is that the micelles dissolve into single chains at a critical micelle temperature as the solvent selectivity decreases. Several studies have investigated the detailed structure of micelles with varying temperature in aqueous solutions [8][9][10][11] One appealing advantage of polymers is their versatility. Architectural parameters of associative polymers may be tuned by changing the chain length, chemical composition and distribution of attractive groups [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Effect of distribution of stickers along backbone on temperature-dependent structural properties in associative polymer solutions

Han¹,

Zhang²,

Ma³

2012

Condens. Matter Phys.

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Effect of distribution of stickers along the backbone on structural properties in associating polymer solutions is studied using self-consistent field lattice model. Only two inhomogeneous morphologies, i.e., microfluctuation homogenous (MFH) and micelle morphologies, are observed. If the system is cooled, the solvent content within the aggregates decreases. When the spacing of stickers along the backbone is increased the temperaturedependent range of aggregation in MFH morphology and half-width of specific heat peak for homogenous solutions-MFH transition increase, and the symmetry of the peak decreases. However, with increasing spacing of stickers, the above three corresponding quantities related to micelles behave differently. It is demonstrated that the broad nature of the observed transitions can be ascribed to the structural changes which accompany the replacement of solvents in aggregates by polymer, which is consistent with the experimental conclusion. It is found that different effect of spacing of stickers on the two transitions can be interpreted in terms of intrachain and interchain associations.

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Temperature Dependence of the Structure and Interaction of Starlike PEG-Based Block Copolymer Micelles

Cited by 20 publications

References 25 publications

Effect of Ionic Group on the Complex Coacervate Core Micelle Structure

Effect of Ionic Group on the Complex Coacervate Core Micelle Structure

Small-angle neutron scattering from giant water-in-oil microemulsion droplets. I. Ternary system

Effect of distribution of stickers along backbone on temperature-dependent structural properties in associative polymer solutions

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