Gorgieva Selestina, Virant Natalija, Ojstršek Alenka
Faculty of Mechanical Engineering, Institute of Engineering Materials and Design, University of Maribor, 2000 Maribor, Slovenia.
Faculty of Electrical Engineering and Computer Science, Institute of Automation, University of Maribor, 2000 Maribor, Slovenia.
Polymers (Basel). 2019 Jul 20;11(7):1216. doi: 10.3390/polym11071216.
The presented study focuses on photoluminescent pigments applied on cotton fabric by a screen-printed procedure using polydimethylsiloxane (PDMS) as a binder. Microscopic data depicts irregular shapes and relatively wide size distribution (3-80 µm) of pigments. Regarding composition, the Energy-Dispersive X-ray (EDX) and Fourier Transform Infrared (FTIR) spectroscopy data complement findings suggesting the presence of Eu-doped strontium aluminate in the yellow-green, calcium aluminate in the violet pigment, and metal oxides in the blue pigment. The optical properties of pigment-enriched PDMS-coated cotton fabric were assessed and reflectance intensity was found to be concentration-dependent only in the blue pigment. The luminescence decay data show that luminescence intensity decreased with the reduction of pigment concentration in the following order, yellow-green > blue > violet pigments. Relying on absorption and emission data of powdered pigments, the confocal microscopy enables visualization of the pigments' distribution within a 3D image projection. This identifies the most homogeneous distribution in the case of the blue pigment, as well as the presence of a continuous fluorescing signal in the z projection when 5% pigment was used. This was, for the first time, presented as a powerful tool for non-destructive visualization of photoluminescent pigments' spatial distribution when printed on textile (cotton) fabric. Finally, the photoluminescent PDMS coating demonstrates high washing and abrasion resistance, contributing to overall functionality of printed cotton fabrics when commercial types of pigments are applied.
本研究聚焦于通过丝网印刷工艺将光致发光颜料应用于棉织物，该工艺使用聚二甲基硅氧烷（PDMS）作为粘合剂。微观数据描绘了颜料的不规则形状和相对较宽的尺寸分布（3 - 80 µm）。关于成分，能量色散X射线（EDX）和傅里叶变换红外（FTIR）光谱数据补充了研究结果，表明黄绿色颜料中存在铕掺杂的铝酸锶，紫色颜料中存在铝酸钙，蓝色颜料中存在金属氧化物。对富含颜料的PDMS涂层棉织物的光学性能进行了评估，发现反射强度仅在蓝色颜料中与浓度有关。发光衰减数据表明，发光强度随颜料浓度降低而降低，顺序为黄绿色>蓝色>紫色颜料。基于粉末状颜料的吸收和发射数据，共聚焦显微镜能够在三维图像投影中可视化颜料的分布。这表明蓝色颜料的分布最为均匀，并且当使用5%的颜料时，在z轴投影中存在连续的荧光信号。这首次被展示为一种强大的工具，用于无损可视化光致发光颜料在纺织（棉）织物上印刷时的空间分布。最后，光致发光PDMS涂层表现出高耐洗性和耐磨性，当应用商业类型的颜料时，有助于提高印花棉织物的整体功能性。
