Seventeen-Armed Star Polystyrenes in Various Molecular Weights: Structural Details and Chain Characteristics
| Autor: | Akira Hirao, Li Xiang, Kyeong Sik Jin, Kuan Hoon Ngoi, Moonhor Ree, Jia Chyi Wong, Chin Hua Chia |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
17-armed star polystyrene
Materials science Polymers and Plastics Cyclohexane Shell (structure) molecular structure Star (graph theory) Article lcsh:QD241-441 chemistry.chemical_compound Dynamic light scattering Chain (algebraic topology) lcsh:Organic chemistry size distribution Molecule synchrotron X-ray scattering analysis molecular size chemistry.chemical_classification Scattering General Chemistry Polymer dynamic light scattering analysis chemistry Chemical physics chain characteristics radial density profile |
| Zdroj: | Polymers, Vol 12, Iss 1894, p 1894 (2020) Polymers Volume 12 Issue 9 |
| ISSN: | 2073-4360 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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