Synthesis and characterization of fluorine‐containing polyacrylate latex with core–shell structure by UV‐initiated seeded emulsion polymerization

Abstract

A core–shell fluorine‐containing polyacrylate emulsion was successfully prepared by UV‐initiated seeded emulsion polymerization in two stages in the presence of two photoinitiators. The water‐soluble photoinitiator for the core polymerization and the oil‐soluble photoinitiator was used for the shell polymerization. Both of the two stage polymerizations could be completed within 15 min and displayed a conversion above 94%. The emulsion and the films were characterized by Fourier transformed infrared spectrometry, transmission electron microscopy, dynamic light scattering, X‐ray photoelectron spectroscopy (XPS), contact angle (CA), and thermogravimetry analysis, respectively. The analysis results indicated that the fluorine‐containing latex particles had very small particle size (40 nm) with a core–shell structure and a narrow particle size distribution. XPS analysis revealed that a gradient concentration of fluorine excited in fluorine‐containing emulsion film from the film–air interface to the film–glass interface. In addition, the film formed from the fluorine‐containing emulsion exhibited not only higher thermal stability but also better hydrophobicity than that of the fluorine‐free emulsion. Copyright © 2010 John Wiley & Sons, Ltd.

1‐naphthylacetic‐acid‐functionalized polyacrylate‐coated urea with dual controlled‐release properties

“…The PBMHs‐NAA were synthesized via the route as shown in Figure 1, and their structures were validated using both FT‐IR (Figure 2) and 1 H NMR (Table I and Figure 3). The FT‐IR characteristic peaks of poly(BMA–MMA–HEA)s (Figure 2, P0) were CH (CH 3 and CH 2 ) at 2960 and 2875 cm −1 , the stretching vibration of CO at 1730 cm −1 , the stretching vibration of OH at 3440 cm −1 , and the strong characteristic absorption peaks of MMA and BMA at 1468, 1383, and 960 cm −1 , which were in accordance with earlier work 26, 27. The characteristic peaks at 782, 1511, and 1598 cm −1 , assigned to the vibrations of CH and CC in the naphthyl ring,27, 28 gradually strengthened as the NAA content increased (Figure 3, P1‐NAA to P4‐NAA).…”

“…The 1 H NMR characteristic peaks of PBMHs‐NAA are shown in Table II and Figure 3. The NMR spectra of P1‐NAA, P2‐NAA, P3‐NAA, and P4‐NAA showed additional signals at 4.1 ppm derived from the methylene bridge of NAA and signals at 7.4–8.1 ppm, confirming the presence of naphthalene aromatic rings,11, 27, 28 and the signals strengthened with increasing NAA content, with the absolute values of the integrals in the range 7.4–8.1 ppm increasing from 0 to 8073.05 (Table III, Figure 3). The combined FT‐IR and 1 H NMR results indicated that NAA was successfully grafted onto the backbones of poly(BMA–MMA–HEA)s and the amount of grafted NAA could be regulated.…”

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

“…(a)). For the poly(FBMA‐ co ‐MMA‐ co ‐BA) fluorine‐containing microemulsion, the perfluoroalkyl parts of FBMA contain C–F bonds, which have high bond energy and could protect the carbon chain segment beneath them . This result demonstrates that fluorine‐containing microemulsion should be a promising carrier for fluorescent microbeads to obtain a better thermal stability.…”

“…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.…”

“…poly[(2‐( N ‐ethylperfluorobutanesulfonamido)ethyl acrylate)‐ co ‐(methyl methacrylate)‐ co ‐(butyl acrylate)‐ co ‐(glycidyl methacrylate)], loaded with CdTe QDs by covalent bonding between the carboxyl groups at the QD surfaces and the epoxy groups at the microemulsion surfaces, referred to as CdTe–poly(FBMA‐ co ‐MMA‐ co ‐BA‐ co ‐GMA) microemulsion hybrid. The introduction of fluorine‐containing groups into acrylate polymers should be beneficial for the product because of their unique properties including high thermal, chemical and weather resistances, and low surface energy, wettability and refractive index owing to the low polarizability and the strong electronegativity of fluorine . Taking advantage of the CdTe–poly(FBMA‐ co ‐MMA‐ co ‐BA‐ co ‐GMA) microemulsion hybrids, we further fabricated uniform fluorescent microbeads using a facile microfluidic device at room temperature.…”