Qing Zhang

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Name: 张清; Zhang, Qing

Organization: Shanghai Jiaotong University , China

Department: School of Chemistry and Chemical Engineering

Title: Professor(PhD)

TOPICS

Polymer

Chemicals
References

Preparation and study of photoswitchable fluorescence nanoparticles based on spirobenzopyran

Co-reporter:Liang Ming, Ling Yan Gu, Qing Zhang, Min Zhao Xue, Yan Gang Liu

Chinese Chemical Letters 2013 Volume 24(Issue 11) pp:1014-1018

Publication Date(Web):November 2013

DOI:10.1016/j.cclet.2013.07.001

The preparation and performance characterization of <50 nm spirobenzopyran-based photochromic nanocomposites with photoswitchable fluorescence are presented. The nanocomposites were fabricated by means of a modified miniemulsion polymerization process, in which the hydrophobic spirobenzopyran was covalently attached to the polymer chains and the matched fluorescent dyes were noncovalently embedded in the nanoscale cross-linked polymeric matrix, respectively. The obtained nanocomposites with a high relative fluorescence quantum yield (Q) exhibited superior fluorescent photoswitchable performance due to the effective photo-induced intermolecular energy transfer. The stability of photomerocyanine was also improved.The opened form of photochromic spirobenzopyran component activates the photoinduced energy transfer process FRET and quenches the emission of the fluorescent component, while the closed form of spiropyran prevents FRET and restores the emission of the fluorescent component.

Modeling of the atom transfer radical polymerization for preparing novel fluorosilicone diblock copolymers in a semi-batch reactor

Co-reporter:Yao Huang;Yin-Ning Zhou;Zheng-Hong Luo

Journal of Applied Polymer Science 2013 Volume 130( Issue 5) pp:3473-3481

Publication Date(Web):

DOI:10.1002/app.39602

ABSTRACT

To investigate the process for the preparation of well-defined poly-dimethylsiloxane-b−2,2,3,3,4,4,4-heptafluorobutylmetharylate block copolymers via a macroinitiator initiated atom transfer radical polymerization (ATRP), a model for the batch and semi-batch ATRP process was presented based on the method of moments. The ATRP mechanism, the diffusion limitation, and the reactor choice were considered in the model. Besides, the polymer molecular weight, monomer conversion, and polymer polydispersity index as a function of polymerization time were described by this model. The model was validated by comparing simulated results with experimental data and was also used to investigate the effects of diffusion limitation and reactor choice (i.e., batch and semi-batch reactors). © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 3473–3481, 2013

Spirobenzopyran-based photochromic nanohybrids with photoswitchable fluorescence

Co-reporter:Zhenkun Hu, Qing Zhang, Minzhao Xue, Qiaorong Sheng, Yan-gang Liu

Optical Materials 2008 Volume 30(Issue 6) pp:851-856

Publication Date(Web):February 2008

DOI:10.1016/j.optmat.2007.03.012

The preparation and performance characterization of about 40 nm spirobenzopyran-based photochromic nanohybrids with photoswitchable fluorescence are presented. The nanohybrids were fabricated by means of a modified miniemulsion polymerization process, in which hydrophobic spirobenzopyran and the matched fluorescent dyes are intermolecularly hybridized and embedded in the nanoscale crosslinked polymeric matrix. The obtained nanohybrids with high relative fluorescence quantum yield (Q) exhibited superior fluorescent photoswitchable performance due to the effective photoinduced intermolecular energy transfer, and also the thermal stability of photomerocyanine was improved.