화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.16, No.8, 686-694, December, 2008
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X-Ray Scattering Studies on Molecular Structures of Star and Dendritic Polymers
Sangwoo Jin, Kyeong Sik Jin, Jinhwan Yoon, Kyuyoung Heo, Jehan Kim, Kwang-Woo Kim, Moonhor Ree†, Tomoya Higashihara1, Takumi Watanabe1, and Akira Hirao1, †
  • 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, Pohang 790-784, Korea
  • 1Polymeric and Organic Materials Department, Graduate School of Science and Engineering, Tokyo Institute of Technology, H-127, 2-12-1, Ohokayama, Meguro-ku, Tokyo 152-8552, Japan
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We studied the molecular shapes and structural characteristics of a 33-armed, star polystyrene (PS-33A) and two 3rd-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 (Θ) 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:33-armed star polystyrene;3rd-generation dendrimer-like star-branched poly(methyl methacrylate)s;small angle X-ray scattering;molecular shape;internal chain structure;good solvent condition;theta solvent condition.
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