Surface properties and structures of diblock and random copolymers with perfluoroalkyl side chains

Nishino, Takashi; Urushihara, Yoshimasa; Meguro, Masashi; Nakamae, Katsuhiko

doi:10.1016/j.jcis.2004.06.082

Cited by 58 publications

(44 citation statements)

References 35 publications

(44 reference statements)

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“…The spectra were resolved into five Gaussian curve-fitted peaks: −CF 3 around 294.0 eV, −CF 2 − around 291.5 eV, −C=O around 288.5 eV, −C−O−C=O around 286.5 eV, and hydrocarbon (−CH n : n=0-3) around 284.6 eV, from high to low binding energy. These peak assignments agree well with the previously reported values [15,30] . Table 2 summarizes the composition of the functional groups at various probe depths of the PBMA-ec-FMA films.…”

Section: Surface Structure Of Fma End-capped Pbma 164 and Pbma 101 Filmssupporting

confidence: 92%

“…The crystalline peak (located at 2θ = 17°) is equivalent to 5.2 Å, according to Bragg's equation. This reflection corresponds to the inter-chain interference from the hexagonal packing of perfluoroalkyl side chains [15,29,30] . It is apparent that a more ordered and closely-packed structure, namely, the hexagonal packing of the perfluoroalkyl side chains, was formed near the end-capped PBMA 164 film surface, compared with the end-capped PBMA 101 film with the same number of FMA units.…”

Section: Surface Structure Of Fma End-capped Pbma 164 and Pbma 101 Filmsmentioning

confidence: 99%

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Effect of block length on the self-assembly of end-capping perfluoroalkyl moieties on the polymer surface

Yang

Zhao

Zhou

et al. 2009

Sci. China Ser. B-Chem.

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Most research on copolymers with fluorinated monomers has focused on the relationship between fluorinated monomer content and the corresponding surface structure. However, the influence of the non-fluorinated block on the surface structure of the copolymer film is unknown. Various molecular weight poly(butyl methacrylates) (PBMA) end-capped with 2-perfluorooctylethyl methacrylate (FMA) units (PBMA-ec-FMA) have been synthesized by atom transfer radical polymerization (ATRP). The effect of the PBMA block length on the surface structure and properties of the polymers both in the solid state and in solution was investigated using various techniques. X-ray photoelectron spectroscopy (XPS), sum frequency generation (SFG) vibrational spectroscopy and X-ray diffraction (XRD) analyses indicated that longer PBMA blocks enhanced both the enrichment of the fluorinated moieties and the order of the packing orientation of the perfluoroalkyl side chains on the surface. This enhancement was attributed mainly to the molecular aggregate structure of the end-capped polymers with long PBMA blocks in the solution and to the interfacial structure at the air/liquid interface, which favors the -(CF 2 ) 7 CF 3 moieties self-assembling on the polymer surface during film formation. This observation suggests that the polyacrylate block structure in fluorinated diblock copolymers, in addition to the fluorinated monomer content, plays an important role in structure formation on the solid surface.self-assembly, fluorinated end-capped polymer, surface structure, PBMA block length

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Section: Surface Structure Of Fma End-capped Pbma 164 and Pbma 101 Filmssupporting

confidence: 92%

Section: Surface Structure Of Fma End-capped Pbma 164 and Pbma 101 Filmsmentioning

confidence: 99%

Effect of block length on the self-assembly of end-capping perfluoroalkyl moieties on the polymer surface

Yang

Zhao

Zhou

et al. 2009

Sci. China Ser. B-Chem.

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“…In the IR spectrum of F-XC-72R, new absorbance bands at ca. 1207 and 1151 cm -1 are observed, which are attributable to C-F x absorptions [23,24], suggesting that the FAS is successfully introduced into XC-72R. Figure 2 compares the contact angle for GDLs with different carbon materials on carbon cloth containing 20% PTFE.…”

Section: Ir Spectra Of Different Carbon Materialsmentioning

confidence: 99%

Fluorination of Vulcan XC-72R for cathodic microporous layer of passive micro direct methanol fuel cell

et al. 2010

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The effect of adding fluorinated Vulcan XC-72R into the microporous layer (MPL) of the cathode in a passive micro direct methanol fuel cell (lDMFC) has been investigated. Upon fluorination with fluoro-alkyl silane (FAS), the surface of XC-72R becomes more hydrophobic, as indicated by contact angle measurements. The performance of the membrane electrode assembly (MEA) is improved significantly when fluorinated Vulcan XC-72R is used in MPL of the cathode. The maximum power density of a passive lDMFC reached ca. 36.2 mW cm -2 at room temperature, and the constant-current discharging test exhibits enhanced stability. Also observed is a decreased water transport coefficient (a), calculated from discharging test, attributable to the greater hydrophobicity resulting in higher liquid pressure on the cathode, which forces more water to flow back to the anode. Additionally, A.C. impedance analysis indicates that the improvement in performance results from the decrease of charge transfer resistance of the cathodic reaction.

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“…Although these theories are not applicable in some conditions [8,9], it is confirmed that surface topography and chemical composition exhibit significant influence on hydrophobicity of a solid surface. Nishino et al [10] studied surface properties of di-block and random copolymers containing fluorine, showing that the difference in molecular sequence caused obvious difference in morphology and composition at the surface. Ha et al [11,12] investigated surface properties of core-shell latex particles containing fluorinated polymer shell.…”

Section: Introductionmentioning

confidence: 99%

“…Emulsion polymerization is very important due to the versatility in structure design and control of the composition in latex particles [10,11,[13][14][15][16][17][18][19][20][21]. To improve compatibility of fluorinated monomers with other monomers and stability of emulsion polymerization, a few amount of acetone is often added in emulsion polymerization [12,22].…”

Section: Introductionmentioning

confidence: 99%

Spherical and core-shell fluorinated polyacrylate latex particles: preparation and characterization

2015

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Fluorinated polyacrylate particles with spherical (SP) and core-shell (CS) structures have been prepared via emulsion polymerization. Morphologies of SP and CS latex particles were observed by transmission electron microscope (TEM). The copolymer and the film were characterized by Fourier transform infrared spectroscopy (FT-IR), 19 F NMR, atomic force microscope (AFM), X-ray photoelectron spectroscopy (XPS), and thermogravimetry (TG-DSC) analyses. Fluorinated components in the copolymer were found to aggregate at the film surface, and the core-shell structure of latex particles contributes to occurrence of phase separation at the film surface. The film prepared from core-shell latex particles exhibits more satisfied water repellency than that obtained from spherical latex particles. Fluorine components at SP and CS film surfaces present significantly different aggregation behaviors.

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Surface properties and structures of diblock and random copolymers with perfluoroalkyl side chains

Cited by 58 publications

References 35 publications

Effect of block length on the self-assembly of end-capping perfluoroalkyl moieties on the polymer surface

Effect of block length on the self-assembly of end-capping perfluoroalkyl moieties on the polymer surface

Fluorination of Vulcan XC-72R for cathodic microporous layer of passive micro direct methanol fuel cell

Spherical and core-shell fluorinated polyacrylate latex particles: preparation and characterization

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