Study on the Intrinsic Fluorescence of Hyperbranched Polyethylenimine-graft-poly(ethylene glycol) Copolymers

Si LI; Yu CHEN

doi:10.14028/j.cnki.1003-3726.2018.07.008

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Study on the Intrinsic Fluorescence of Hyperbranched Polyethylenimine-graft-poly(ethylene glycol) Copolymers

更新时间：2022-09-06

- Study on the Intrinsic Fluorescence of Hyperbranched Polyethylenimine-graft-poly(ethylene glycol) Copolymers
- Polymer Bulletin Vol. 31, Issue 7, Pages: 69-73(2018)
- 作者机构：
  
  天津大学理学院化学系，天津　300354
- 作者简介：
- 基金信息：
- DOI：10.14028/j.cnki.1003-3726.2018.07.008
  CLC：
- Published：20 July 2018，
  
  Received：05 March 2018，
  
  Revised：12 April 2018，
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Si LI, Yu CHEN. Study on the Intrinsic Fluorescence of Hyperbranched Polyethylenimine-graft-poly(ethylene glycol) Copolymers. [J]. Polymer Bulletin 31(7):69-73(2018)
DOI：

Si LI, Yu CHEN. Study on the Intrinsic Fluorescence of Hyperbranched Polyethylenimine-graft-poly(ethylene glycol) Copolymers. [J]. Polymer Bulletin 31(7):69-73(2018) DOI： 10.14028/j.cnki.1003-3726.2018.07.008.

摘要

通过两步法制备了超支化聚乙烯亚胺接枝聚乙二醇共聚物(HPEI-g-PEG)。荧光表征发现，随着激发波长的增加，样品的最大发射峰不断红移，荧光强度的最大值先有所增强，在360nm处达到最大值，然后随着激发波长的增加而不断下降。分别以360和470nm为激发波长，HPEI-g-PEG分别发射最大发射波长为455nm的蓝光和最大发射波长为535nm的绿光，其蓝光强度明显强于绿光强度。提高PEG的取代度、增加聚合物的浓度、延长聚合物的氧化时间均有利于提高HPEI-g-PEG绿光发射与蓝光发射强度的比值。改变pH值对提高HPEI-g-PEG绿光发射与蓝光发射强度比值没有显著影响。与HPEI-g-PEG的蓝光发射相比，其绿光发射具有更专一的金属离子选择性。

Abstract

Hyperbranched polyethylenimine-graft-poly (ethylene glycol) copolymers (HPEI-g-PEGs) were prepared through two steps. Fluorescence characterizations demonstrated that increasing the excitation wavelength (λ

) led to the gradual red-shift of the maximum emission wavelength (λ

). Moreover

the emission intensity initially increased with the λ

increase

and reached the maximum at 360 nm. Further increasing λ

resulted in the gradual decrease of emission intensity. With λ

= 360 and 470nm

HPEI-g-PEG could emit blue light with the maximum λ

= 455nm and green light with the maximum λ

= 535nm

respectively. The emission intensity of blue light was obviously stronger than that of green light. Raising the degree of substitution of PEG

increasing the polymer concentration and prolonging the oxidation time all favored to the elevation of the emission intensity ratio of green to blue light. Whereas altering the pH of solution had no marked influence on the emission intensity ratio of green to blue light. Compared with the blue emission

the green emission of HPEI-g-PEG was more selective toward metal ions.

关键词

超支化共聚物荧光超支化聚乙烯亚胺聚乙二醇

Keywords

Hyperbranched copolymerFluorescenceHyperbranched polyethyleniminePoly(ethylene glycol)

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