静电纺丝制备稀土复合纤维及其光学性质研究
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摘要
稀土有机配合物具有发光强度高、发光寿命长、光谱呈现尖锐的线状谱带等特点,在技术领域有着广泛的应用,如:可用于生化和分析化学中作生物探针、生物标记、有机电致发光器件、功能发光膜层等领域,在高敏时间分辨荧光免疫分析和探索生命遗传物质结构上也具有重要应用价值。虽然稀土有机配合物具有良好的发光性能,但其热稳定性和机械稳定性较差、可加工处理性差,因而限制了其实际应用。将稀土有机配合物与高分子进行复合,一方面为稀土离子提供稳定的化学环境,改善稀土配合物发光性质;另一方面使高分子功能化,可以把稀土离子的发光性质与高分子优良的机械性能有机的结合在一起,制备具有发光性质的稀土配合物高分子复合发光材料。
     本文主要以稀土配合物-聚合物复合材料为研究对象。采用无皂乳液法、超声法与静电纺丝法相结合制备稀土配合物-聚合物复合发光纤维。通过扫描电子显微镜(SEM)、傅里叶红外光谱(FT-IR)、X射线电子衍射光谱(XRD)和荧光光谱(FS)等基本表征手段,探索制备条件对纤维形貌、结构和发光性质的影响,并优化制备条件,获得色纯度高、发光强度好和荧光寿命长的产品。获得的主要结果如下:
     分别用沉淀法和超声法制备出静电纺丝所需的稀土配合物,改变制备过程的pH值、超声功率等因素,制备了不同纳米单元(纳米球,纳米棒)的稀土配合物,且它们发光性质有着明显的变化;采用超声辐照引发乳液聚合法将稀土配合物包埋于聚合物基质中,形成核壳结构,防止外界对稀土配合物表面发光中心的猝灭作用,使之有望应用于潮湿环境、水下环境或海洋环境;改变静电纺丝过程中的各种参数,制备了直径大小、发光强度、荧光寿命明显不同的稀土配合物-聚合物复合纤维。
Luminescent rare earth organic complexes are of fundamental and technical interest due to their characteristic luminescence properties, such as extremely sharp emission bands, long lifetime, and potential high internal quantum efficiency. It can be used in analytical chemistry and biochemistry as biological probe, biomarkers, organic electroluminescent devices, shine membrane layer. In highly sensitive time-resolved fluorescence immunoassay analysis and exploration on the structure of genetic material life also has important application value. However, pure complexes usually do not have good thermal and mechanical stabilities and processing ability, which restricts the complexes to promising extensive photophysical applications and limited practical uses. Rare earth complexes incorporated in polymer matrixes embody a new class of materials that present the characteristics of both the complexes and polymers.
     Rare earth complexes - polymer composite materials were studied in our research. Combining soap-free polymerization, sonication with electrospinning, the rare earth complexes - polymer composition fibers were obtained. The effect of different factors on the the morphology, structure and luminescent properties of composition fibers were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform Infrared spectroscopy (FT-IR) and Fluorescence Spectrometer (FS). Under optimized conditions, rare earth complexes - polymer composition fibers with pure emission, high luminescent intensity and long life time can be prepared. The major results as follows:
     Rare earth complexes, used in the electrospinning, were prepared by precipitation and sonication respectively. Changing the factor, such as pH during the precipitation and power output during the sonication, the rare earth complexes are with different nano unit (nanoparticles , nanorods), luminescent intensity and life time. The rare earth complexes were incorporated in the polymer via sonication, and thus composition nanoparticles with core-shell structure were formed. Furthermore, the parameters of electrospinning have important effect on the morphology and uminescent properties of the rare earth complexes - polymer composition fibers .
引文
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