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学科主题: 高分子化学
题名: Re-examination of Dynamics of Polyeletrolytes in Salt-Free Dilute Solutions by Designing and Using a Novel Neutral-Charged-Neutral Reversible Polymer
其他题名: Re-examination of Dynamics of Polyeletrolytes in Salt-Free Dilute Solutions by Designing and Using a Novel Neutral-Charged-Neutral Reversible Polymer
作者: Zhou KJ(周科进) ; Li JF(李军方) ; LU YIJIE ; Zhang GZ(张广照) ; Xie ZW(谢作伟) ; Wu Q(吴奇)
通讯作者: 吴奇
刊名: Macromolecules
发表日期: 2009-01-01
卷: 42, 期:18, 页:7146-7154
收录类别: SCI
部门归属: 上海有机所; 中国科学技术大学; 香港中文大学
英文摘要: By using the Staudinger ligation to attach 4-{5'-{1 ''-(dimethylamino)-ethylideneamino}pentyl}-1-methyl-2-(diphenylphosphino )terephthalate to poly(p-azidomethylstyrene)-co-polystyrene (PAMS-co-PS), we Successfully prepared a novel polymer that can undergo a neutral-charged-neutral transition in DM F with 0.5% H2O when the solution is alternatively bubbled with CO2 and N-2. Such a reversible change is confirmed by its sharp conductivity variation. Armed with this polymer, we re-examined dynamics of salt-free polyelectrolyte dilute solutions by using laser light scattering (LLS). As expected, there exists only one diffusive relaxation mode in the neutral state. The bubbling Of CO2 decreases the scattering intensity and splits this initial diffusive relaxation mode into a fast and a slow diffusive mode, and their scattering intensity contributions are independent of the scattering angle, indicating that the slow mode is not related to some scattering objects larger than the LLS observation length (similar to 35 nm < 1/q < similar to 190 nm). The bubbling of N-2 gradually diminishes the slow mode and returns both the scattering intensity and solution dynamics back to their initial neutral state. The change from dilute to semidilute solution slows the fast relaxation down and suppresses the slow mode. On the other hand, the addition of LiBr (50 mM) can completely suppress electrostatic interaction.
语种: 英语
相关网址: 查看原文
WOS记录号: WOS:000269699400042
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内容类型: 期刊论文
URI标识: http://ir.sioc.ac.cn/handle/331003/25309
Appears in Collections:上海有机化学研究所_期刊论文

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Recommended Citation:
Zhou KJ,Li JF,LU YIJIE,et al. Re-examination of Dynamics of Polyeletrolytes in Salt-Free Dilute Solutions by Designing and Using a Novel Neutral-Charged-Neutral Reversible Polymer[J]. Macromolecules,2009,42(18):7146-7154.
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