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Determination of the critical chain length for macromolecular crystallization using structurally flexible polyketones
| Title: | Determination of the critical chain length for macromolecular crystallization using structurally flexible polyketones |
| Authors: | Ide, Yuki Browse this author | | Manabe, Yumehiro Browse this author | | Inaba, Yuya Browse this author | | Kinoshita, Yusuke Browse this author | | Pirillo, Jenny Browse this author | | Hijikata, Yuh Browse this author | | Yoneda, Tomoki Browse this author →KAKEN DB | | Shivakumar, Kilingaru I. Browse this author | | Tanaka, Saki Browse this author | | Asakawa, Hitoshi Browse this author | | Inokuma, Yasuhide Browse this author →KAKEN DB |
| Issue Date: | 14-Sep-2022 |
| Publisher: | Royal Society of Chemistry |
| Journal Title: | Chemical science |
| Volume: | 13 |
| Issue: | 34 |
| Start Page: | 9848 |
| End Page: | 9854 |
| Publisher DOI: | 10.1039/d2sc03083g |
| Abstract: | Critical chain length that divides small molecule crystallization from macromolecular crystallization is an important index in macro-organic chemistry to predict chain-length dependent properties of oligomers and polymers. However, extensive research on crystallization behavior of individual oligomers has been inhibited by difficulties in their synthesis and crystallization. Here, we report on the determination of critical chain length of macromolecular crystallization for structurally flexible polyketones consisting of 3,3-dimethylpentane-2,4-dione. Discrete polyketone oligomers were synthesized via stepwise elongation up to 20-mer. Powder and single crystal X-ray diffraction showed that the critical chain length for polyketones existed at an unexpectedly short chain length, 5-mer. While shorter oligomers adopted unique conformations and packing structures in the solid state, higher oligomers longer than 4-mer produced helical conformations and similar crystal packing. The critical chain length helped with understanding the inexplicable changes in melting point in the shorter chain length region resulting from chain conformations and packing styles. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/86730 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 猪熊 泰英
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