Investigation of fluorinated polyacrylate latex with core–shell structure

Abstract

Fluorinated polyacrylate latices with core-shell structure were prepared by semi-continuous emulsion polymerization, using a mixed emulsifier system composed of a reactive emulsifier and a small amount of anionic emulsifier. The conversion and chemical components of the final latices were studied by gravimetric methods and Fourier-transform infrared (FTIR) spectrometry, respectively. The structure of the latex particles was determined by differential scanning calorimetry (DSC), transmission electron microscopy (TEM) and particle size analysis. The latex films exhibited a low surface energy and high water-contact angles. The surface analysis from X-ray photoelectron spectroscopy (XPS) revealed that the fluorinated components preferentially self-organized at the film-air interface. From XPS depth profiling of the film, it was found that a gradient concentration of fluorine existed in the structure of the latex film from the film-air interface to the film-glass interface. Compared with the core-shell structure with a fluorinated core, the core-shell structure with a fluorinated shell was more effective for modifying the properties of the latex films.

Synthesis and characterization of core‐shell particles containing a perfluoroacrylate copolymer rich in the shell

“…Measurements of 1 H, 19 F, and 29 Si NMR were carried out on an INOVA 600 MHz spectrometer at 258C using chloroform-d as the solvent. Chemical shifts for 19 F NMR are stated downfield from trifluorotrichloroethane (C 2 F 3 Cl 3 ).…”

“…Measurements of 1 H, 19 F, and 29 Si NMR were carried out on an INOVA 600 MHz spectrometer at 258C using chloroform-d as the solvent. Chemical shifts for 19 F NMR are stated downfield from trifluorotrichloroethane (C 2 F 3 Cl 3 ). Thermal analysis of the resulting FA copolymers was conducted under a PerkinElmer DSC7 instrument with a temperature gradient ranging from À60 to 2008C at 208C/min.…”

“…These are achieved (i) through appropriate synthesis of segmented, block, or graft copolymers structures that favor surface segregation, 9,14,15 or (ii) by blending with nonfluorinated polymers, 16 which will eventually phase separate, and (iii) through the migration of the fluorinated side chain in the shell. [17][18][19] The ultimate goal in designing the structured particles is to use a little FA and to obtain the most of the À ÀCF 3 groups array at final film/air interfaces, which will then be more hydrophobic than an entirely hydrogenated films.…”

Preparation and Characterization of Coating Solution Based on Waterborne Polyurethane Dispersion containing Fluorine for Primer on Electro Galvanized Steel Sheet

“…However, in most cases poor adhesion and relatively high production cost may circumscribe their use. It is one of the important topics of the research on how to make the fluorinated components play a better role and how to increase the bond strength of the material on the promise of maintaining good surface properties of materials [7][8][9][10] . The defects could be improved through these methods: the copolymerization of fluorinated monomer with other monomers and the mixing of fluorinated compound with other emulsions.…”

Gradient Structure and Surface Property of Fluorinated Polyacrylate and Polyurethane Latex Blend Films

“…It is one of the important topics of the research on how to make the fluorinated components play a better role and how to increase the bond strength of the material on the premise of maintaining good surface properties of materials. The defects could be improved through these methods: the copolymerization of fluorinated monomer with other monomers, 5-9 preparation of core-shell particles [10][11][12][13] and the mixing of fluorinated polyacrylate with other emulsion.…”