一种新型荧光聚氨酯的制备与研究

荧光聚氨酯在荧光聚合物研究领域中近年受到越来越多的关注,为了制备一种具有多功能的荧光聚氨酯,以1,5–二羟基萘为荧光功能单体,合成了一种新型的具有固态和酸碱响应荧光发射的多功能聚氨酯(MFU).采用核磁共振(1H NMR)、红外光谱(FTIR)、紫外–可见光谱(UV–vis)对其进行了结构表征,分别用溶液样品和固态薄膜...

Preparation and Study of a Novel Fluorescent Polyurethane

Fluorescent polyurethane had attracted more and more attention in recent years in the field of fluorescent polymer research. A novel multifunctional polyurethane (MFU) with solid and acid-base response fluorescence emission was synthesized using 1, 5-dihydroxynaphthalene as fluorescent functional monomer. The structure was confirmed by characterization with 1H NMR, FTIR and UV-vis. The fluorescence luminescence properties of the solid and solution samples were studied by fluorescence spectrophotometer. The acid-base response fluorescence properties of MFU solution samples were also studied by dropwise adding experiment. The results showed that the proton absorption peak of naphthene group appeared in the range of 7.20-7.54 ppm in 1H NMR, which corresponds to the vibration peak of naphthene group skeleton in the vicinity of 1630 cm-1, 1548 cm-1, 1483 cm-1 in FTIR spectrum, and the conjugated absorption band at 226 nm and in the range of 260 to 340 nm in the UV-vis spectrum. In addition, the peak at 226 nm in the UV-vis spectrum was selected as the reference, and the standard curve method was used for quantitative analysis according to the lambert-bill law. The results of analysis indicated that the content of fluorescent groups in the MFU molecular chain was consistent with the theoretical calculation within the error allowed. Structural characterizations revealed that fluorescent polyurethane containing functional groups 1,5-dihydroxynaphthalene in the molecular chain was successfully prepared. Fluorescence spectra showed that MFU samples had strong fluorescence emission at a wide range of 460 nm in either solution or solid state, while the pure polyurethane samples had no significant fluorescence emission in either state. Interestingly, the solution samples had different luminous wavelengths in the acid (490 nm, blue-green light) and base (460 nm, blue light) environments, with a maximum displacement of over 30 nm. In terms of fluorescence intensity, which in the strongly alkaline (pH=11) environment decreased by 89% compared to the strongly acidic (pH=3) environment. Based on the dual-characteristic response behavior of MFU solution samples in acid-base environment, the novel fluorescent polyurethane MFU is expected to be used in dual-signal detection for strong acid and strong base. Therefore, a novel multifunctional polyurethane with solid state and acid-base response fluorescence emission was successfully prepared by introducing fluorescent functional monomer through chemical bond.