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Ree BJ, Satoh Y, Jin KS, Isono T, Satoh T. Unimodal and Well-Defined Nanomicelles Assembled by Topology-Controlled Bicyclic Block Copolymers. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c01916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Brian J. Ree
- Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Yusuke Satoh
- Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Kyeong Sik Jin
- PLS-II Beamline Division, Pohang Accelerator Laboratory, Pohang 37673, Republic of Korea
| | - Takuya Isono
- Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Toshifumi Satoh
- Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
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Wong JC, Xiang L, Ngoi KH, Chia CH, Jin KS, Kim HC, Kim HJ, Hirao A, Ree M. Molecular weight effect on the structural detail and chain characteristics of 33-armed star polystyrene. POLYMER 2021. [DOI: 10.1016/j.polymer.2020.123304] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Wong JC, Xiang L, Ngoi KH, Chia CH, Jin KS, Hirao A, Ree M. Seventeen-Armed Star Polystyrenes in Various Molecular Weights: Structural Details and Chain Characteristics. Polymers (Basel) 2020; 12:E1894. [PMID: 32842480 PMCID: PMC7563263 DOI: 10.3390/polym12091894] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Revised: 08/18/2020] [Accepted: 08/20/2020] [Indexed: 11/17/2022] Open
Abstract
Star-shaped polymers are very attractive because of their potential application ability in various technological areas due to their unique molecular topology. Thus, information on the molecular structure and chain characteristics of star polymers is essential for gaining insights into their properties and finding better applications. In this study, we report molecular structure details and chain characteristics of 17-armed polystyrenes in various molecular weights: 17-Arm(2k)-PS, 17-Arm(6k)-PS, 17-Arm(10k)-PS, and 17-Arm(20k)-PS. Quantitative X-ray scattering analysis using synchrotron radiation sources was conducted for this series of star polymers in two different solvents (cyclohexane and tetrahydrofuran), providing a comprehensive set of three-dimensional structure parameters, including radial density profiles and chain characteristics. Some of the structural parameters were crosschecked by qualitative scattering analysis and dynamic light scattering. They all were found to have ellipsoidal shapes consisting of a core and a fuzzy shell; such ellipse nature is originated from the dendritic core. In particular, the fraction of the fuzzy shell part enabling to store desired chemicals or agents was confirmed to be exceptionally high in cyclohexane, ranging from 74 to 81%; higher-molecular-weight star polymer gives a larger fraction of the fuzzy shell. The largest fraction (81%) of the fuzzy shell was significantly reduced to 52% in tetrahydrofuran; in contrast, the lowest fraction (19%) of core was increased to 48%. These selective shell contraction and core expansion can be useful as a key mechanism in various applications. Overall, the 17-armed polystyrenes of this study are suitable for applications in various technological fields including smart deliveries of drugs, genes, biomedical imaging agents, and other desired chemicals.
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Affiliation(s)
- Jia Chyi Wong
- Materials Science Program, Department of Applied Physics, Faculty of Science and Technology, University Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia; (J.C.W.); (K.H.N.)
- Department of Chemistry and Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673, Korea;
| | - Li Xiang
- Department of Chemistry and Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673, Korea;
| | - Kuan Hoon Ngoi
- Materials Science Program, Department of Applied Physics, Faculty of Science and Technology, University Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia; (J.C.W.); (K.H.N.)
- Department of Chemistry and Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673, Korea;
| | - Chin Hua Chia
- Materials Science Program, Department of Applied Physics, Faculty of Science and Technology, University Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia; (J.C.W.); (K.H.N.)
| | - Kyeong Sik Jin
- Pohang Accelerator Laboratory, Pohang University of Science & Technology, Pohang 37673, Korea
| | - Akira Hirao
- Department of Chemical Science and Engineering, Graduate School of Materials and Chemical Engineering, Tokyo Institute of Technology, 2-12-1-S1-13, Ohokayama, Meguro-ku, Tokyo 152-8550, Japan
- Department of Chemical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Moonhor Ree
- Department of Chemistry and Pohang Accelerator Laboratory, Pohang University of Science and Technology, Pohang 37673, Korea;
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