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Structures of the cylindrical and vesicular micelles of an P4VP-longer asymmetric PS-b-P4VP

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    The solution samples were prepared in different Vo (wt% of toluene in the toluene/ethanol mixture). The sample holder for SAXS has a mica window for X-ray transmission. The solutions were injected into the holder and then the hole was sealed with epoxy in order to prevent evaporation. Experiments were performed at beamline 4C1 in the Pohang Light Acceleration Source (PAL, Korea), where a W/B4C doublemultilayer monochromator delivered monochromatic X-rays that had a wavelength of 0.16 nm. A flat Au mirror was used to reject the higher harmonics from the beam. A MarCCD camera (Mar USA, Inc. CCD165) was used to collect the scattered X-rays. The sample-to-detector distance (sdd) was 3 m, which allowed the SAXS data to be obtained in a q range between 0.06 and 1.11 nm-1 (sdd=3 m). The sdd was calibrated using SEBS (polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene).

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    The raw spectra were corrected by conventional procedures for the background of the solvent and sample cell and detector efficiency. Two-dimensional scattering spectra were azimuthally averaged. The measured intensityI(q) can be expressed as the product of form (F(q)) and structure (S(q)) factors, althoughS(q) is negligible for the dilute solution. The SAXS data were analyzed with GIFT software, which was developed by Glatter.26–32 The Fourier transformation ofI(q) yields the pair distance distribution function (p(r)) of a particle, which is a histogram of distances inside the particle weighted with the electron density differences. The shape ofp(r) allows for the determination of basic geometry (spherical, cylindrical, or vesicular), even for inhomogeneous particles.D max is the maximum intraparticle distance andd max =π/q min whereq min is the peak position in the scattering pattern.D max was determined as the value of r at whichp(r)=0.

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Correspondence to Soo-Young Park.

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Ali, N., Sul, W., Lee, D. et al. Structures of the cylindrical and vesicular micelles of an P4VP-longer asymmetric PS-b-P4VP. Macromol. Res. 17, 553–556 (2009). https://doi.org/10.1007/BF03218907

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Keywords

  • Block Copolymer
  • Micellar Structure
  • Diethyl Phthalate
  • Solvent Selectivity
  • SAXS Data