Hydrogen-bond-assisted stereocontrol in the radical polymerization of N-isopropylacrylamide with bidentate Lewis base
Hydrogen-bond-assisted stereocontrol in the radical polymerization of N-isopropylacrylamide with bidentate Lewis base
复制标题
N-异丙基丙烯酰胺双齿路易斯碱自由基聚合中的氢键辅助立体调控
DOI:
10.1016/j.polymer.2005.11.057
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发表时间:
2006
期刊:
影响因子:
4.6
通讯作者:
Tsuneyuki Sato
中科院分区:
文献类型:
--
作者:
Tomohiro Hirano;H. Kitajima;M. Seno;Tsuneyuki Sato
Radical polymerization of N-isopropylacrylamide (NIPAAm) in toluene was investigated in the presence of bidentate Lewis base such as diphosphonates. Isotacticity of the obtained poly(NIPAAm)s slightly increased at −80°C, whereas syndiotactic-rich poly(NIPAAm)s were obtained at −40–0°C. This result corresponded to the results observed in the presence of primary alkyl phosphates. NMR analysis revealed that NIPAAm monomer and tetraisopropyl methylenebisphosphonate formed mono-binding hydrogen-bond-assisted complex at 0°C, but a chelate complex at −80°C. Thus, it was concluded that the stereospecificity in NIPAAm polymerization strongly depended on the complexation mode of the added bidentate Lewis base.
影响因子:
1.6
作者:
Mana Ito;Takashi Ishizone
通讯作者:
Mana Ito;Takashi Ishizone
DOI:
--
发表时间:
2004
期刊:
Macromolecules 37
影响因子:
--
作者:
Masanobu Uchiyama;et al.
通讯作者:
et al.