聚乳酸荧光防伪纤维的制备及其性能

Preparation and Properties of the Fluorescent Anti-Counterfeiting Poly(lactic acid) Fibers

通过熔融纺丝法成功制备了聚乳酸荧光防伪纤维。分别采用DSC、XRD、纤维强度仪、荧光光谱仪、荧光显微镜等探讨了荧光粉含量对聚乳酸荧光防伪纤维的结晶结构、力学性能与荧光性能的影响,并利用激光共聚焦显微镜对防伪纤维进行了3D荧光分布模拟分析。研究结果表明:聚乳酸荧光防伪纤维在紫外光激发下,在530nm处出现最强发射峰,纤维呈黄绿色荧光;随着荧光粉含量的增加,纤维的荧光强度增加,但荧光粉在基体中的团聚现象逐渐加剧,纤维的断裂强度逐渐降低;激光共聚焦显微镜可较好地模拟荧光防伪纤维中荧光粉的分布情况。

The fluorescent anti-counterfeiting poly（lactic acid） （PI.A） fibers were prepared by melt spin- ning. The effect of the fluorescent powder mass fraction on the crystalline structure, mechanical properties and fluorescence properties of the fluorescent anti-counterfeiting PLA fibers were characterized by DSC, XRD, fiber strength tester, fluorescence spectroscopy and fluorescence microscopy. Moreover, 3D fluo- rescence distribution of fluorescent anti-counterfeiting PLA fibers was simulated by using the confocal laser scanning microscopy. Results showed that the emission spectra of fluorescent anti-counterfeiting PLA fibers peaked at 530 nm, indicating the fibers show yellow-green under UV light. With the increasing mass fraction of fluorescent powder, the fluorescence strength of the fibers increased, whereas the tensile strength decreased due to the agglomeration of fluorescent powder. In addition, confocal laser scanning microscopy could be used well to simulate the distribution of fluorescent powder among the fibers.