Table 5.
Structural parameters of micelles of the amphiphilic block copolymers obtained from the quantitative analysis of scattering data with three phase ellipsoid model.
| Structural Parameter | Amphiphilic Block Copolymer Micelle | ||||
|---|---|---|---|---|---|
| l-PBA-b-PEO | l-PBA-b-PEO-b-PBA | c-PBA-b-PEO | |||
| Re,micellea (nm) | 8.50 (0.61) b | 6.26 (0.49) | 6.05 (0.32) | ||
| rcoreb (nm) | 1.90 (0.35) | 1.73 (0.25) | 1.65 (0.15) | ||
| tf,cored (nm) | 1.90 (0.35) | 1.73 (0.25) | 1.65 (0.15) | ||
| td,coronae (nm) | 0.50 | 0.40 | 0.30 | ||
| tf,d.coronaf (nm) | 4.80 (0.40) | 0.80 (0.15) | 0.60 (0.05) | ||
| ts.coronag (nm) | 0.72 | 0.31 | 0.12 | ||
| tf,s.coronah (nm) | 1.80 (0.30) | 3.65 (0.40) | 3.80 (0.10) | ||
| ε i | 1.50 | 0.83 | 0.82 | ||
| ξj (nm) | 1.70 | 0.55 | 0.60 | ||
| Rgk (nm) | 7.84 | 4.59 | 4.42 | ||
| ρcorel (g/cm3) | 1.08 | 1.08 | 1.23 m | ||
| ρcoronan (g/cm3) | 0.059 | 0.054 | 0.058 | ||
| N agg o | 24.3 | 9.1 | 8.9 | ||
a Micelle radius in equatorial direction. b Standard deviation. c Radius of the core. d Thickness of the fuzzy part (interfaced with the dense corona) of the core. e Thickness of the dense corona. f Thickness of the fuzzy part (interfaced with the soft corona) of the dense corona. g Thickness of the solvated corona. h Thickness of the fuzzy part (interfaced with solvent) of the solvated corona. i Ellipsoidicity ratio (ε = polar radius/equatorial radius). j Average correlation length of density fluctuation (i.e., blob radius) in the entire corona region. k Radius of gyration of micelle. l Density of micelle core is assumed to be the density of linear PBA homopolymer. m Density value of micelle core consisting of cyclic PBA-b-PEO [31]. n Density of corona estimated from the aggregation number of copolymer chains Nagg, the number-average molecular weight of the PEO block, and the total volume of the corona. o Aggregation number of copolymer chains in a single micelle, which was estimated from the core volume and the assumption that the density of the core composed of PBA block is same with that of the corresponding ρcore values.