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学科主题: 高分子化学 ; 氟化学
题名: Association of fluorocarbon and hydrocarbon end-capped poly(ethylene glycol)s: NMR fluroescence studies
其他题名: 氟碳或碳氢基团封端的聚氧乙烯的缔合作用: 核磁和萤光法研究
作者: Zhou JC(周济苍) ; Zhuang DQ(荘东青) ; Yuan XF(袁晓峰) ; Jiang M(江明) ; Zhang YX(章云祥)
通讯作者: 江明
刊名: Langmuir
发表日期: 2000-01-01
卷: 16, 期:24, 页:9653-9661
收录类别: SCI
部门归属: 上海复旦大学; 中国科学院上海有机化学研究所高分子材料研究室
英文摘要: Poly(ethylene glycol)-based associating polymers with fluorocarbon and hydrocarbon hydrophobes (F-PEG & H-PEG) were synthesized. Their association behavior in aqueous solutions was investigated by NMR and a fluorescent probe technique. NMR results demonstrate that besides the hydrophobe, the urethane linkage connecting the hydrophobe and PEG chain is incorporated into the hydrophobic core as well. Thus, the F-PEG micelles consisting of both the fluorocarbon chain and urethane linkage possess a dual H/F character, whereas a pure H one exists for H-PEG micelles. Three types of fluorescent probes, that is, pyrene, 9-(anthrylmethyloxymethyl)pyrene (AMOP), and 1-(perfluorooctanoyl)pyrene (PyCORf), have been used to monitor the association, with emphasis on comparing their probing abilities for different microdomains. As for H-PEG, both pyrene and AMOP are effective in monitoring the association and measuring the critical aggregation concentration (GAO). In addition, AMOP presents information about the microviscosity of the micelles. Nevertheless, pyrene and AMOP cannot serve as effective probes for the association of small-molecular fluorocarbon surfactant PC 143 because of their limited solubility in pure fluorocarbon microdomains. Compared with the surfactant case, the probing abilities of both pyrene and AMOP are markedly improved for F-PEG. This is attributed to the dual 115 character of F-PEG micelles, which enhances their affinity to the probes. PyCORf, the probe carrying a fluorocarbon chain, is affective and informative in the studies of F-PEG association as a result of its good affinity to fluorocarbon microdomains. The variation of excimer intensity of PyCORf at 465 nm is suggested as a criterion for association and estimating the CAC of F-PEG.
语种: 英语
相关网址: 查看原文
内容类型: 期刊论文
URI标识: http://ir.sioc.ac.cn/handle/331003/24495
Appears in Collections:高分子材料研究室_期刊论文

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Recommended Citation:
Zhou JC,Zhuang DQ,Yuan XF,et al. Association of fluorocarbon and hydrocarbon end-capped poly(ethylene glycol)s: NMR fluroescence studies[J]. Langmuir,2000,16(24):9653-9661.
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