In this paper, we reported a series of green fluorescent flame-retardant waterborne polyurethane polyols. The polyurethane polyols were uniformly sized and possessed decent colloidal stability. Comparing to other reported products, our aqueous dispersions showed much stronger fluorescence intensity and greatly improved long-term stability, which were desired for practical applications. Small molecule conjugation units were gated into polyurethane chains via reaction between −OH of naphthalene and −NCO of diisocyanate, which restricts intramolecular rotation of naphthalene chromophores and non-radiative transition to enhance fluorescence intensity. The non-radiative transition and chromophore aggregation are weakened to hinder aggregation-caused quenching of chromophores to improve fluorescence by weak collision. This study has demonstrated a facile method to prepare waterborne polyurethane polyols, providing detailed explanation and guidance for related work in the future.

中文翻译：

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绿色荧光水性聚氨酯多元醇

在本文中，我们报道了一系列绿色荧光阻燃水性聚氨酯多元醇。聚氨酯多元醇大小均匀并具有良好的胶体稳定性。与其他报道的产品相比，我们的水分散体显示出更强的荧光强度和大大提高的长期稳定性，这是实际应用所需要的。通过萘的-OH和二异氰酸酯的-NCO之间的反应，小分子共轭单元被门控到聚氨酯链中，这限制了萘发色团的分子内旋转和非辐射跃迁以增强荧光强度。非辐射跃迁和发色团聚集减弱，以阻止发色团聚集引起的猝灭，从而通过弱碰撞改善荧光。