WEKO3
-
RootNode
アイテム
Syndiotactic- and heterotactic-specific radical polymerization of N-n-propylmethacrylamide complexed with alkali metal ions
https://tokushima-u.repo.nii.ac.jp/records/2008145
https://tokushima-u.repo.nii.ac.jp/records/2008145f9efbd4a-c724-4bd5-ba1e-bb81a55a2dfc
名前 / ファイル | ライセンス | アクション |
---|---|---|
![]() |
|
Item type | 文献 / Documents(1) | |||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
公開日 | 2020-09-11 | |||||||||||||||||||||||||||||||||||||||||
アクセス権 | ||||||||||||||||||||||||||||||||||||||||||
アクセス権 | open access | |||||||||||||||||||||||||||||||||||||||||
資源タイプ | ||||||||||||||||||||||||||||||||||||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||||||||||||||||||||||||||||||
資源タイプ | journal article | |||||||||||||||||||||||||||||||||||||||||
出版社版DOI | ||||||||||||||||||||||||||||||||||||||||||
関連識別子 | https://doi.org/10.1039/C5PY00755K | |||||||||||||||||||||||||||||||||||||||||
関連名称 | 10.1039/C5PY00755K | |||||||||||||||||||||||||||||||||||||||||
出版タイプ | ||||||||||||||||||||||||||||||||||||||||||
出版タイプ | AM | |||||||||||||||||||||||||||||||||||||||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa | |||||||||||||||||||||||||||||||||||||||||
タイトル | ||||||||||||||||||||||||||||||||||||||||||
タイトル | Syndiotactic- and heterotactic-specific radical polymerization of N-n-propylmethacrylamide complexed with alkali metal ions | |||||||||||||||||||||||||||||||||||||||||
著者 |
平野, 朋広
× 平野, 朋広
WEKO
59
× セガタ, タダシ
× ハシモト, ジュンペイ
× ミワ, ヨウヘイ
× 押村, 美幸
WEKO
473
× 右手, 浩一
WEKO
239
|
|||||||||||||||||||||||||||||||||||||||||
抄録 | ||||||||||||||||||||||||||||||||||||||||||
内容記述 | We investigated the radical polymerization of N-n-propylmethacrylamide (NNPMAAm) in the presence of alkali metal bis(trifluoromethanesulfonyl)imides (MNTf2), in particular LiNTf2. The addition of MNTf2 led to a significant improvement in the yield and molecular weight of the resulting poly(NNPMAAm)s. Furthermore, the solvent employed influenced stereospecificity in the presence of LiNTf2. The stoichiometry of the NNPMAAm–Li+ complex appeared to be critical to determining the stereospecificity in the NNPMAAm polymerization. The 1:1-complexed monomer in protic polar solvents provided syndiotactic-rich polymers, whereas the 2:1-complexed monomer in aprotic solvents gave heterotactic-rich polymers. Stereochemical analyses revealed that m-addition by an r-ended radical was the key step in the induction of heterotactic specificity in the aprotic solvents. Spectroscopic analyses suggested that the Li+ cation played a dual role in the polymerization process, with Li+ stabilizing the propagating radical species and also activating the incoming monomer. Kinetic studies with the aid of electron spin resonance spectroscopy revealed that the addition of LiNTf2 caused a significant increase in the kp value and a decrease in the kt value. The stereoregularity of poly(NNPMAAm)s was found to influence the phase transition behavior of their aqueous solutions. In a series of syndiotactic-rich polymers, the phase-transition temperature decreased gradually with increase in rr triad content. Furthermore, heterotactic-rich poly(NNPMAAm) exhibited high hysteresis, which increased in magnitude with increasing mr triad content. | |||||||||||||||||||||||||||||||||||||||||
書誌情報 |
en : Polymer Chemistry 巻 6, 号 27, p. 4927-4939, 発行日 2015-06-04 |
|||||||||||||||||||||||||||||||||||||||||
収録物ID | ||||||||||||||||||||||||||||||||||||||||||
収録物識別子タイプ | ISSN | |||||||||||||||||||||||||||||||||||||||||
収録物識別子 | 17599962 | |||||||||||||||||||||||||||||||||||||||||
出版者 | ||||||||||||||||||||||||||||||||||||||||||
出版者 | The Royal Society of Chemistry | |||||||||||||||||||||||||||||||||||||||||
EID | ||||||||||||||||||||||||||||||||||||||||||
識別子 | 295157 | |||||||||||||||||||||||||||||||||||||||||
言語 | ||||||||||||||||||||||||||||||||||||||||||
言語 | eng |