8-Hydroxypyrene-1,3,6-trisulfonic acid trisodium salt (HPTS), a water-soluble pyrene dye, was used to develop highly fluorescent waterborne polyurethane (WPU) by physical dispersion in WPU matrix. The presence of negatively charged sulfonate ions in HPTS moiety assisted in homogeneous dispersion of HPTS in WPU matrix. The optical properties of HPTS-WPU emulsion and films were characterized by UV-Vis and PL spectroscopy and observed to exhibit high fluorescence property both in emulsion state as well as in solid state even at very low concentration. The fluorescence intensity was found to increase with increasing weight % of the HPTS dye in WPU matrix. Further, pH sensing behavior of these films was also investigated by exposing to trifluoroacetic acid (TFA) vapor (pka = 0.23) and ammonia (NH₃) vapor (pkb = 9.25). Observations revealed that HPTS retained not only its highly green fluorescent nature in WPU matrix but also exhibited pH sensing behavior. The overall analysis suggested that HPTS-WPU could be used to develop an environmentally friendly high fluorescent smart coatings and textiles inheriting real-time pH sensing property.

水溶性pyr染料8-羟基py-1,3,6-三磺酸三钠盐（HPTS）用于通过物理分散在WPU基质中来开发高荧光水性聚氨酯（WPU）。HPTS部分中带负电荷的磺酸根离子有助于HPTS在WPU基质中均匀分散。HPTS-WPU乳液和薄膜的光学特性通过UV-Vis和PL光谱进行了表征，并观察到即使在非常低的浓度下，乳液状态和固态均显示出高荧光性能。发现荧光强度随着WPU基质中HPTS染料的重量％增加而增加。此外，还通过暴露于三氟乙酸（TFA）蒸汽（pka = 0.23）和氨气（NH ₃）蒸气（pkb = 9.25）。观察结果表明，HPTS不仅在WPU基质中保留了其高度绿色的荧光性质，而且还表现出pH传感行为。总体分析表明，HPTS-WPU可用于开发具有实时pH感应特性的环保型高荧光智能涂料和纺织品。