Anomalous small-angle X-ray scattering characterization of bulk block copolymer/nanoparticle composites

Byeongdu Lee, Chieh-Tsung Lo, Soenke Seifert, Nancy L. Dietz Rago, Randall E. Winans, Pappannan Thiyagarajan

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

We demonstrate the versatility of anomalous small-angle X-ray scattering (ASAXS) to investigate the morphology of bulk multicomponent composites comprising poly(stryrene-b-2-vinylpyridine) (PS-PVP) and Au nanoparticles. Contrast variation near the L3 absorption edge of Au enables the separation of the partial scattering functions of the polymer and nanoparticle phases. Theoretical and experimental methodologies developed for our ASAXS analysis of the composites will be useful for the investigation of other such multicomponent systems with heavy elements. This study shows that at 8.8% Au loading the Au nanoparticles remain well dispersed in the lamellar polymer matrix, while at 27.0% Au loading the polymer morphology transforms to a hexagonal packed cylinder phase due to the change in the curvature caused by the higher concentration of the dispersed nanoparticles in the PS domain. In the case of 27.0% Au nanocomposite we also observe strong concentration fluctuations of nanoparticles in the polymer phase, with a hierarchical structure containing mass fractal aggregates and particle-particle correlation as evidenced by the Q-2.4 power law scattering in the low Q and a liquid-like peak at the high Q regions of the scattering signal from the nanoparticles.

Original languageEnglish
Pages (from-to)4235-4243
Number of pages9
JournalMacromolecules
Volume40
Issue number12
DOIs
Publication statusPublished - 2007 Jun 12

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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