核-壳结构水性氟化聚氨酯-丙烯酸酯薄膜性能研究

Study on the properties of core-shell waterborne fluorinated polyurethane acrylate film

本文通过引入氟化的聚氨酯和聚丙烯酸酯单体,成功得到含有不同含量的丙烯酸羟乙酯的水性氟化聚氨酯-丙烯酸酯。在我们的研究中,粒子大小(d),黏度(η)和水性氟化聚氨酯-丙烯酸酯杂合乳液的核-壳结构进行了描述,用傅里叶变换红外光谱仪(FT-IR)分析薄膜,并且描述了表面能,热稳定性和水性氟化聚氨酯-丙烯酸酯薄膜的力学性能特征。所得的结果表明,丙烯酸羟乙酯的增加对水性氟化聚氨酯-丙烯酸酯薄膜的热稳定性,力学性能和防污能力都有利。当丙烯酸羟乙酯的含量从0%增加至3.28%时,水和二碘甲烷的接触角分别从101.8°~121.1°和从63.1°增加至81.4°。并且薄膜试样拉伸强度由20.5 MPa提高到30.32 MPa。同时,从DSC曲线的分析来看,玻璃化转变温度已得到改进。然而,从光电子能谱的分析可得知,丙烯酸羟乙酯含量增加对氟元素迁移到薄膜表面也会有有一些消极的影响。

In this paper,the fluorinated polyurethane acrylate with different content of hydroxyethyl acrylate was successfully obtained by introducing fluorinated polyurethane and polyacrylate monomer.In our research,particle size(d),viscosity(η)and core shell structure of waterborne polyurethane acrylate hybrid emulsion were described.Fourier transform infrared spectroscopy(FT-IR)was used to analyze the films.The mechanical properties of the surface energy,thermal stability and waterborne fluorinated polyurethane acrylate films were also described.The results showed that the increase of hydroxyethyl acrylate was beneficial to the thermal stability,mechanical properties and antifouling ability of waterborne fluorinated polyurethane acrylate films.When the content of hydroxyethyl acrylate increased from 0%to 3.28%,the contact angles of water and diiomethane increased from 101.8°to 121.1°and from 63.1°to 81.4°respectively.Moreover,the tensile strength of the film sample was increased from 20.5 MPa to 30.32 MPa.At the same time,from the analysis of DSC curve,the glass transition temperature had been improved.However,from the analysis of photoelectron spectroscopy,it could be seen that the increase of hydroxyethyl acrylate content would have some negative effects on the migration of fluorine to the film surface.