Preparation and surface properties of core‐shell polyacrylate latex containing fluorine and silicon in the shell

Abstract

The core-shell polyacrylate latex particles containing fluorine and silicon in the shell were successfully synthesized by a seed emulsion polymerization, using methyl methacrylate (MMA) and butyl acrylate (BA) as main monomers, dodecafluoroheptyl methacrylate (DFMA), and c-(methacryloxy) propyltrimethoxy silane (KH-570) as functional monomers. The influence of the amount of fluorine and silicon monomers on the emulsion polymerization process and the surface properties of the latex films were discussed, and the surface free energy of latex films were estimated using two different theoretical models. The emulsion and its films were characterized by particle size distribution (PSD) analysis, transmission electron microscopy (TEM), Fourier transform infrared spectrum (FTIR), nuclear magnetic resonance ( 1 H-NMR and 19 F-NMR) spectrometry, contact angle (CA) and X-ray photoelectron spectroscopy (XPS), differential scanning calorimetry (DSC), and thermogravimetry (TG) analysis. The results indicate that the average particle size of the latex particles is about 160 nm and the PSD is narrow, the synthesized latex particles exist with core-shell structure, and a gradient distribution of fluorine and silicon exist in the latex films. In addition, both the hydrophobicity and thermal stability of the latex films are greatly improved because of the enrichment of fluorine and silicon at the filmair interface, and the surface free energy is as low as 15.4 mN/m, which is comparable to that of polytetrafluoroethylene (PTFE).

Synthesis, film morphology, and performance of cationic fluorinated polyacrylate emulsion with core‐shell structure

“…It can be seen from Figure 5 that the latex particles exist with clear and uniform spherical core‐shell structure due to the difference of electron penetrability to the core phase and the shell phase. The light and dark regions in the particles correspond to the polyacrylate core phase and the fluorinated polyacrylate shell phase, respectively 4, 12. The particles are uniform spheres with the average diameter of about 120 nm, which is consistent with the results measured by PSD analysis (shown in Fig.…”

“…This phenomenon could be illustrated that through seeded emulsion polymerization, fluorine containing acrylate monomer could be anchored in the shell of the latex particles and the perfluoroalkyl groups containing CF bonds has high bond energy. Thus thermal stability of the copolymer is improved 12…”

“…Up to date, fluorinated acrylate polymers emulsions with various structures, such as graft,7 random,8 hybrid nanocomposites,9 and core‐shell,4, 10–12 can be synthesized by conventional emulsion polymerization, suspension–emulsion combined polymerization, mini emulsion polymerization, seeded emulsion polymerization, and other synthetic polymerization techniques. Core‐shell fluorinated polyacrylate latex synthesized via seeded emulsion polymerization was particularly attractive as a result of their typical advantage in film formation compared with general emulsion, especially the latex consisting of fluorine‐free acrylic core and fluorine‐containing acrylic shell.…”

“…Anionic fluorinated acrylic polymers emulsions with core‐shell structure are often reported in literatures;4, 10–14 however, little work has been focused on the preparation and the film morphology of the cationic fluorinated acrylic latexes with core‐shell structure, which show very high adhesion to different ionic substrates, especially anionic substrates such as textile, paper, leather, and glass. So in this article, we fabricated a novel cationic fluorinated polyacrylate emulsion (CFBDH) with core‐shell structure through seeded emulsion polymerization of DFMA, BA, DM, and HpA and then utilized Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance spectrum ( 1 H‐NMR), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), contact angle (CA), scanning electron microscopy (SEM), X‐ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM), etc., to investigate the structures and morphology of the emulsion and its films.…”

Microfluidic assembly of uniform fluorescent microbeads from quantum‐dot‐loaded fluorine‐containing microemulsion

“…Both spectra show stretching vibrations of C=O at 1746 cm −1 and C−O−C at 1168 cm −1 , consistent with the characteristic bands of MMA and BA. For the fluorine‐containing microemulsion, the stretching and wagging vibrations of C–F bonds can be seen at 1247 and 686 cm −1 , respectively . Comparing the two spectra, Fig.…”