摘要
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样品在荧光分光光度计上研究了其荧光发光性质,还用酸碱滴加实验研究了MFU溶液样品的酸碱响应荧光性质。结果表明:核磁谱图在δ=7.20~7.54范围内出现萘环质子吸收峰,红外光谱在1630、1548、1483 cm^-1附近出现萘环骨架振动峰,可见-紫外吸收光谱中在226 nm处以及260~340 nm范围也出现萘环共轭吸收谱带;另外,选取紫外光谱中226 nm为基准,根据朗伯-比尔定律,用标准曲线法拟合定量分析可知,MFU分子链中荧光基团含量与理论计算基本一致;综合表明,分子链中含有功能基团1,5-二羟基萘的荧光聚氨酯被成功制备。荧光光谱表明,MFU样品无论是溶液状态还是固体状态,在460 nm左右宽范围内都有较强的荧光发射,而相对照的纯聚氨酯样品在两种状态下均没有明显的荧光发射。此外,溶液样品在酸(490 nm,蓝绿光)和碱(460 nm,蓝光)环境下具有不同的发光波长,最大位移超过30 nm;荧光强度方面,强碱性(pH=11)相对于强酸性(pH=3)环境下的荧光强度降低了89%。基于MFU溶液样品在酸碱环境中表现出发光颜色和发光强度的双特征响应行为,新型荧光聚氨酯MFU有望用于强酸和强碱的双信号探测。因此,通过化学键接引进荧光功能单体,成功制备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。
Fluorescent polyurethane has 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 to 7.54 in 1H NMR,which corresponds to the vibration peak of naphthene group skeleton in the vicinity of 1630,1548,1483 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 con-taining 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,bluegreen light)and base(460 nm,blue light)environments,with a maximum displacement of over 30 nm.The fluorescence intensity 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.
作者
彭青海
聂泽坤
蔡绪福
PENG Qinghai;NIE Zekun;CAI Xufu(College of Polymer Sci.and Eng.,Sichuan Univ.,Chengdu 610065,China)
出处
《工程科学与技术》
EI
CAS
CSCD
北大核心
2021年第1期212-218,共7页
Advanced Engineering Sciences
基金
国家自然科学基金项目(51873114)。
关键词
荧光聚氨酯
1
5-二羟基萘
固态荧光
酸碱响应荧光
fluorescent polyurethane
1,5–dihydroxynaphthalene
solid-state fluorescence
acid-base response fluorescence
