Re-examination of Dynamics of Polyeletrolytes in Salt-Free Dilute Solutions by Designing and Using a Novel Neutral-Charged-Neutral Reversible Polymer

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	Re-examination of Dynamics of Polyeletrolytes in Salt-Free Dilute Solutions by Designing and Using a Novel Neutral-Charged-Neutral Reversible Polymer
	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)
刊名	Macromolecules
	2009
卷号	42 期号:18 页码:7146-7154
ISSN号	0024-9297
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
通讯作者	吴奇
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.
学科主题	高分子化学
收录类别	SCI
原文出处	http://dx.doi.org/10.1021/ma900541x
语种	英语
WOS记录号	WOS:000269699400042
公开日期	2013-04-11
内容类型	期刊论文
源URL	[http://202.127.28.38/handle/331003/25309]
专题	上海有机化学研究所_上海有机化学研究所
推荐引用方式 GB/T 7714	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.
APA	周科进,李军方,LU YIJIE,张广照,谢作伟,&吴奇.(2009).Re-examination of Dynamics of Polyeletrolytes in Salt-Free Dilute Solutions by Designing and Using a Novel Neutral-Charged-Neutral Reversible Polymer.Macromolecules,42(18),7146-7154.
MLA	周科进,et al."Re-examination of Dynamics of Polyeletrolytes in Salt-Free Dilute Solutions by Designing and Using a Novel Neutral-Charged-Neutral Reversible Polymer".Macromolecules 42.18(2009):7146-7154.