ID | 115347 |
タイトル別表記 | Hydrogen-Bond-Assisted Syndiotactic-Specific Radical Polymerizations of N-Alkylacrylamides : the Effect of the N-Substituents on the Stereospecificities and Unusual Large Hysteresis in the Phase Transition Behavior of Aqueous Solution of Syndiotactic Poly(N-n-propylacrylamide)
RADICAL POLYMERIZATIONS OF N-ALKYLACRYLAMIDES
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著者 |
Nakamura, Kimihiko
Tokushima University
Kamikubo, Takahiro
Tokushima University
Ishii, Satoshi
Tokushima University
Tani, Kanami
Tokushima University
森, 健
Kyushu University
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キーワード | stereospecific polymers
radical polymerization
stimuli-sensitive polymers
hydrogen bond
N-alkylacrylamides
syndiotactic
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資料タイプ |
学術雑誌論文
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抄録 | The radical polymerizations of N-alkylacrylamides, such as N-methyl- (NMAAm), N-n-propyl- (NNPAAm), N-benzyl- (NBnAAm), and N-(1-phenylethyl)acrylamides (NPhEAAm), at low temperatures were investigated in the absence or presence of hexamethylphosphoramide (HMPA) and 3-methyl-3-pentanol (3Me3PenOH), which induced the syndiotactic-specificities in the radical polymerization of N-isopropylacrylamide (NIPAAm). In the absence of the syndiotactic-specificity inducers, the syndiotacticities of the obtained polymers gradually increased as the bulkiness of the N-substituents increased. Both HMPA and 3Me3PenOH induced the syndiotactic-specificities in the NNPAAm polymerizations as well as in the NIPAAm polymerizations. The addition of 3Me3PenOH into the polymerizations of NMAAm significantly induced the syndiotactic-specificities, whereas the tacticities of the obtained polymers were hardly affected by adding HMPA. In the polymerizations of bulkier monomers, such as NBnAAm and NPhEAAm, HMPA worked as the syndiotactic-specificity inducer at higher temperatures, whereas 3Me3PenOH hardly influenced the stereospecificity, regardless of the temperatures. The phase transition behaviors of the aqueous solutions of poly(NNPAAm)s were also investigated. It appeared that the poly(NNPAAm) with racemo dyad content of 70% exhibited unusual large hysteresis between the heating and cooling processes.
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掲載誌名 |
Journal of Polymer Science Part A : Polymer Chemistry
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ISSN | 0887624X
10990518
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cat書誌ID | AA1068915X
AA11624127
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出版者 | Wiley
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巻 | 46
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号 | 13
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開始ページ | 4575
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終了ページ | 4583
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発行日 | 2008-05-28
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権利情報 | This is the peer reviewed version of the following article: Hirano, T., Nakamura, K., Kamikubo, T., Ishii, S., Tani, K., Mori, T. and Sato, T. (2008), Hydrogen‐bond‐assisted syndiotactic‐specific radical polymerizations of N‐alkylacrylamides: The effect of the N‐substituents on the stereospecificities and unusual large hysteresis in the phase‐transition behavior of aqueous solution of syndiotactic poly(N‐n‐propylacrylamide). J. Polym. Sci. A Polym. Chem., 46: 4575-4583., which has been published in final form at https://doi.org/10.1002/pola.22797. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
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言語 |
eng
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著者版
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部局 |
理工学系
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