采用激基缔合物荧光寿命探究水性分散体成膜过程中粒子间分子链相互融合  

Using Pyrene Excimer Fluorescence Lifetime to Probe Polymer Diffusion in Aqueous Polyurethane Dispersion Film-Forming Process

作　　者：耿武松 汪许俭 张一娇 王武生[1] Geng Wusong;Wang Xujian;Zhang Yijiao;Wang Wusheng(School of Chemistry and Chemical Engineering,Anhui University,Hefei 230601,China)

机构地区：[1]安徽大学化学化工学院,合肥230601

出　　处：《涂料工业》2021年第12期1-6,共6页Paint & Coatings Industry

摘　　要：为探究水性分散体成膜过程中粒子间分子链相互融合的过程,采用合成的芘丁酸二羟基丙酯作为荧光扩链剂,合成荧光标记型水性聚氨酯以及结构相近的未标记型水性聚氨酯,将荧光标记水性聚氨酯分散体与过量的非标记水性聚氨酯混合成膜,采用稳态瞬态荧光光谱仪测量纯标记分散体与其混合膜的激基缔合物的荧光寿命,通过建立激基缔合物荧光寿命和荧光物质浓度之间的线性方程,计算得出颗粒融合深度来表征融合过程。结果表明:在成膜粒子分子链相互融合阶段,荧光标记分子链扩散进入非标记区域使得荧光标记浓度降低。对研究水性聚氨酯颗粒粒子融合深度与成膜温度、粒径、软段含量、交联度的关系有一定的意义。In order to explore the process of fusion of molecular chains between particles in the film forming process of aqueous polyurethane dispersions,synthetic dihydroxypropyl pyrene butyrate was used as a fluorescent chain extender to synthesize fluorescent-labeled aqueous polyurethane and unlabeled aqueous polyurethane with similar structure. A steadystate transient fluorescence spectrometer was used to measure the fluorescence lifetime of the excimer of the pure labeled dispersion and its mixed film. By means of establishing a linear equation between the fluorescence lifetime of the excimer and the concentration of the fluorescent substance,the depth of particle fusion could be calculated,which was used to characterize the fusion process. The results show that:during the fusion stage of the molecular chains of the film-forming particles,the fluorescent-labeled molecular chains diffuse into the non-labeled area,so that the concentration of the fluorescent label decreases. It can contribute to the relationship research of the fusion depth of waterborne polyurethane particles with the film-forming temperature,particle size,soft segment content and crosslinking degree.

关 键 词：激基缔合物 荧光寿命 荧光标记 水性聚氨酯分散体 成膜 粒子间分子链相互融合 

分 类 号：TQ633[化学工程—精细化工]