Preparation and characterization of luminescent polyimide/glass composite fiber

Abstract

Different types of fluorescent materials and technologies are widely used in the fields of chemical sensing, molecular recognition and fluorescence imaging. However, most of the researches were carried out in liquid state due to the aggregation-caused quenching of fluorescent materials. In order to realize the application of flexible small-size fluorescence sensor in solid state, the preparation and properties of luminescent fibers were studied in this work. The composite fibers were formed by electrospun pyrene-containing polyimide and glass fibers which were used as the shell and core layer, respectively. The samples could display bright yellowish-green luminescence in various shapes, such as bows, letters and curls. Meanwhile, the thermal decomposition temperature of composite fibers in N2 and air could reach to 551 and 563 °C, respectively. In the high-temperature variable experiment (from 323 k to 423 K), the fluorescence intensity of samples showed a linear response (R2 = 0.9905) to different temperatures. Here, a feasible technical method ensures that the pyrene-containing polyimide/glass fiber composite materials perform the excellent fluorescence properties, thermal stability and flexibility. It promotes the application of these materials in fluorescence anti-counterfeiting, tracing and detection in the future.