Browsing by Author "Matsuo, Yuri"

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Precise syntheses of structurally possible all tetrablock quaterpolymers by a methodology combining living anionic polymerization with linking chemistry using 1: 1 addition reaction
(2018-02-21)
Goseki, Raita
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Matsuo, Yuri
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Hirao, Akira
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應用化學系
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Department of Applied Chemistry
A methodology combining living anionic polymerization with linking chemistry using 1 : 1 addition reaction has been developed for the syntheses of tetrablock quaterpolymers composed of A, B, C, and D blocks. With this methodology using the omega-chain-end-(alpha-phenylacrylate (PA))-functionalized D, alpha,omega-chain-end-(2-tetrahydropyranyl ether and PA)-functionalized D, and omega-chain-end-PA-functionalized AD as the building blocks, the following all structurally possible twelve tetrablock quaterpolymers were successfully synthesized: ABCD, ABDC, ACBD, ACDB, ADBC, ADCB, BACD, BADC, BCAD, BDAC, CABD, and CBAD. Polystyrene, poly(2-vinylpyridine), poly(tert-butyl methacrylate) (or poly(methyl methacrylate)), and poly(1,2-butylene oxide) prepared by living anionic polymerization were used as A, B, C, and D blocks, respectively. The polymers synthesized in this study are quite new tetrablock quaterpolymers and well-defined in structure.
Precise Synthesis of Macromolecular Architectures by Novel Iterative Methodology Combining Living Anionic Polymerization with Specially Designed Linking Chemistry
(2017-10-01)
Goseki, Raita
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Ito, Shotaro
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Matsuo, Yuri
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Higashihara, Tomoya
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Hirao, Akira
This article reviews the development of a novel all-around iterative methodology combining living anionic polymerization with specially designed linking chemistry for macromolecular architecture syntheses. The methodology is designed in such a way that the same reaction site is always regenerated after the polymer chain is introduced in each reaction sequence, and this polymer chain introduction and regeneration of the same reaction site sequence is repeatable. Accordingly, the polymer chain can be successively and, in principle, limitlessly introduced to construct macromolecular architectures. With this iterative methodology, a variety of synthetically difficult macromolecular architectures, i.e., multicomponent -star polymers, high generation dendrimer-like hyperbranched polymers, exactly defined graft polymers, and multiblock polymers having more than three blocks, were successfully synthesized.
Tailored Synthesis of Triblock Co- and Terpolymers Composed of Synthetically Difficult Sequence Orders by Combining Living Anionic Polymerization with Specially Designed Linking Reaction
(2016-03)
Matsuo, Yuri
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Konno, Ryuji
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Goseki, Raita
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Ishizone, Takashi
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Hirao, Akira
This study demonstrates the versatility and wider applicability of the recently developed methodology combining the living anionic polymerization with a specially designed linking reaction using the alpha-phenylacrylate (or benzyl bromide) function, allowing the synthesis of triblock co- and terpolymers, which are otherwise difficut to be obtained by sequential addition of monomers during a sequential polymerization approach. With this methodology using styrene and four para -substituted styrene derivatives with N-cyclohexylimine, 4-N,N -dimethyl-2-oxazoline, 2,6-di(tert-butyl)-4-methylphenyl ester, and nitrile, 12 polymers among the 16 possible triblock terpolymers and 6 triblock copolymers were successfully synthesized. Furthermore, the synthesis of two tetrablock quarterpolymers was achieved by the same linking methodology. The polymers synthesized in this study are all well-controlled in chain length, composition, which are difficult to be obtained by the sequential polymerization. In addition, they possess functional groups usable for the further modification and introduction of other functionalities.