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Electrospinning Preparation of Fluorescent Tare-Earth/Polymer Composite Nanofibers and Studies on Its Structure and Properties

Author: ZhangXiaoPing
Tutor: LiuLi
School: Beijing University of Chemical Technology
Course: Materials Science and Engineering
Keywords: Coaxial electrospinning Rare Earth Organic Complex Nanocomposites Fluorescent properties
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 235
Quote: 1
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Abstract


Electrospinning nanofibers prepared material has a large surface area and pore size and complexity, easy surface functionalization and physical and mechanical properties and excellent features, they have been widely used in the optical and chemical sensors, efficient filter materials, biomedical materials, nanocomposite materials. However, the electrospinning current research focus is mainly limited to the plastic material, while the rubber material nanofibers rarely reported, the obtained rubber-fiber morphology is not ideal. Nanofiber problems are difficult to obtain due to lower glass transition temperature for the rubber-like material, electrospinning easily springback This thesis uses the coaxial electrospinning technique, with the outer rigid plastic protective limiting effect successfully prepared nanofibers with diameters in the range of 400 ~ 600nm at room temperature vulcanizing silicone rubber (RTV). Meanwhile, combining the excellent fluorescent properties of the organic complexes of rare earth β-diketones, such as light emitting high color purity, long fluorescence lifetime, quantum yield, etc., application electrospinning technique was prepared having good dispersion structure (nano-size and high dispersion degrees) high luminous efficiency of the rare earth nano-fiber composite material. The main contents of the thesis is as follows: (1) prepared by electrospinning technique has higher fluorescence intensity and quantum yield of Eu (where, TTA: thenoyl trifluoroacetone phen: Adjacent (TTA) 3phen/PVP and phenanthroline, PVP: polyvinylpyrrolidone) nanofiber composites (120-170nm). High power the TEM spectroscopy (EDS) and XRD tests showed that Eu (TTA) 3phen in PVP fiber matrix to molecular clusters or very small particles (less than 10nm) state exists close to the dispersion effect polymerization prepared the dispersion of the single molecule level. The fluorescence performance test and the Judd-Ofelt theory analysis shows that this good dispersion reduces the rate of photoelectron radiative transition in the transition process of China-Africa so that the fibers of the fluorescence intensity and quantum efficiency has been significantly improved. (2) application of the coaxial spinning technique prepared having a core - shell structure RTV / PVP nanofibers by SEM and TEM, investigated the type and molecular chain structure of the polymer, the concentration of the spinning solution, the spinning solution of the inner and outer layers mutual insoluble advance speed, spinning voltage coaxial electrospinning process and fiber morphology and structure, and illustrates that the rubber nano-fiber formation mechanism and morphology control method, prepared nano rubber and fiber. At the same time, combined with RTV excellent low temperature performance and Eu (TTA) 3phen excellent fluorescent properties coaxial electrospinning technology prepared Eu (TTA) 3phen/RTV/PVP elastomer nano fluorescent fibers. And combination of fluorescence spectroscopy, fluorescence life and Judd-Ofelt theory-depth study of the composite cryogenic fluorescence performance, and to explore the contribution of the rubber matrix of Eu (TTA) 3phen was low-temperature fluorescence performance, and Eu (TTA) 3phen was in the fiber matrix decentralized structure its fluorescent properties of the relationship between.

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