可聚合乳化剂稳定的乳液成膜荧光可视化过程及调控机制

Popularization and application of water borne coating has been the environment-friendly and cleaning trend in the field of decorative paintings. It is effective to replace conventional emulsifier with polymerizable emulsifier to improve the emulsion properties. However, lack of much theoretical and experimental evidence in film formation mechanism becomes the barrier to further advancement in the performance of water borne paints. Fluorescent probe has been employed in many fields such as biomedicine for its intuitive visualization and proved to be an effective method to study the internal mechanism. In our study, we intend to design and synthesis polymerizable fluorescent donor-acceptor pairs with Fluorescence resonance energy transfer effect. The dye pairs then copolymerized with comonomers and polymerizable emulsifier, separately. By in-situ observation of film formation process, we can obtain the characteristic parameters of latex motion in the presence of polymerizable emulsifier. Qualitative and quantitative relationship between fluorescence information and film structure and properties will be investigated to explore mechanism of film formation of latex stabilized by polymerizable emulsifiers. This will help us to obtain what plays the key role in the determination of film performance, which is of great importance in development of high performance emulsions for water borne coatings.

水性涂料的推广应用已成为装饰涂装领域中环保、清洁的发展趋势。可聚合乳化剂代替传统乳化剂是提高乳液性能的有效手段，但对其成膜机制的认识还缺乏有力的理论和实验支持，束缚了水性涂料应用性能的进一步提高。由于荧光探针的直观可视化而被生物医学等多领域采用，成为研究内在作用机制的有效方法。本课题拟将设计制备具有FRET荧光效应的可聚合供体-受体分子对，分别与聚合物单体及可聚合乳化剂形成共聚物乳液，以可视化的手段实时原位观测乳液成膜过程，获取可聚合乳化剂稳定乳液成膜过程中乳液粒子运动的特征参数，研究其荧光信息与涂膜结构、性能的定性定量关系，探索可聚合乳化剂稳定的乳液成膜机理，获取决定涂膜性能的关键控制因素，这对可用于水性涂料高性能乳液的开发具有重要意义。

水性涂料的推广应用已成为装饰涂装领域中环保、清洁的发展趋势。可聚合乳化剂代替传统乳化剂是提高乳液性能的有效手段，但对其成膜机制还缺乏有力的理论和实验支持，束缚了水性涂料应用性能的进一步提高。本项目依据FRET原理，选用荧光素和罗丹明B作为基础结构，制备了两类可聚合荧光探针分子，研究了荧光发射光谱、紫外-可见吸收光谱、稳定性及可聚合基团的引入对光谱特性的影响；在可聚合乳化剂存在下将荧光单体分子与丙烯酸酯类单体进行共聚，制备了荧光丙烯酸酯乳液，研究了其粒径、粒径分布等，通过研究乳胶膜的荧光光谱的变化，给出了可聚合乳化剂存在下乳液成膜的机制。利用分子动力学方法初步研究了可聚合乳化剂用量对高分子链段分布的影响，针对传统荧光分子在成膜过程中可能导致的猝灭现象，制备了具有AIE效应的荧光探针分子，并研究了其光谱特性，拟进一步利用AIE效应研究乳液成膜过程。发表高水平论文4篇，申请发明专利2项，培养研究生2名。