Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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X-Ray Scattering Studies on Molecular Structures of Star and Dendritic Polymers

  • Jin, Sang-Woo (Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK school of Molecular Science, Pohang University of Science and Technology) ;
  • Jin, Kyeong-Sik (Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK school of Molecular Science, Pohang University of Science and Technology) ;
  • Yoon, Jin-Hwan (Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK school of Molecular Science, Pohang University of Science and Technology) ;
  • Heo, Kyu-Young (Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK school of Molecular Science, Pohang University of Science and Technology) ;
  • Kim, Je-Han (Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK school of Molecular Science, Pohang University of Science and Technology) ;
  • Kim, Kwang-Woo (Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK school of Molecular Science, Pohang University of Science and Technology) ;
  • Ree, Moon-Hor (Department of Chemistry, National Research Lab for Polymer Synthesis & Physics, Pohang Accelerator Laboratory, Center for Integrated Molecular Systems, Polymer Research Institute, and BK school of Molecular Science, Pohang University of Science and Technology) ;
  • Higashihara, Tomoya (Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology) ;
  • Watanabe, Takumi (Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology) ;
  • Hirao, Akira (Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology)
  • Published : 2008.12.31
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Abstract

We studied the molecular shapes and structural characteristics of a 33-armed, star polystyrene (PS-33A) and two $3^{rd}$-generation, dendrimer-like, star-branched poly(methyl methacrylate)s with different architectures (pMMA-G3a and PMMA-3Gb) and 32 end-branches under good solvent and theta ($\Theta$) solvent conditions by using synchrotron small angle X-ray scattering (SAXS). The SAXS analyses were used to determine the structural details of the star PS and dendrimer-like, star-branched PMMA polymers. PS-33A had a fuzzy-spherical shape, whereas PMMA-G3a and PMMA-G3b had fuzzy-ellipsoidal shapes of similar size, despite their different chemical architectures. The star PS polymer's arms were more extended than those of linear polystyrene. Furthermore, the branches of the dendrimer-like, star-branched polymers were more extended than those of the star PS polymer, despite having almost the same number of branches as PS-33A. The differences between the internal chain structures of these materials was attributed to their different chemical architectures.

Keywords

References

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