Nanoclay stabilized Pickering miniemulsion of fluorinated copolymer with improved hydrophobicity via RAFT polymerization

Chakrabarty, Arindam; Ponnupandian, Siva; Naskar, Kinsuk; Singha, Nikhil K.

doi:10.1039/c5ra25808a

Cited by 14 publications

(4 citation statements)

References 35 publications

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“…When the surface is roughened, the change in the liquid surface energy results in two possible contact angles: the Wenzel apparent contact angle, and the Cassie–Baxter apparent contact angle . By changing clay content from 1% to 3, the WCA value was increased with approximately 20° . However, the additional increase of clay loading resulted to a slight decrease with WCA value of PMATRIF/MMT‐5.…”

Section: Resultsmentioning

confidence: 99%

Preparation of fluorinated methacrylate/clay nanocomposite via in‐situ polymerization: Characterization, structure, and properties

Karamane

Raihane

Taşdelen

et al. 2016

J. Polym. Sci. Part A: Polym. Chem.

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Novel fluorinated coating containing well-dispersed silicate nanolayers is successfully produced via in-situ free radical polymerization of 2,2,2-trifluoroethyl methacrylate in the presence of vinylbenzyl-functionalized montmorillonite with different loading. The organic modification of sodium montmorillonite is achieved through an ion exchange reaction with triphenylvinylbenzylphosphonium chloride as surfactant prepared before use by reaction with vinylbenyl chloride and phosphine. The following in-situ polymerization in the presence of organomodified clay leads to fluorinated nanocomposites with of partially exfoliated and intercalated morphologies, as determined via XRD and TEM analysis. The nanoscale dispersion of clay layers is also evidenced by thermal analysis; a moderate decrease of the glass transition temperature about 2-8 8C compared to their virgin PMATRIF and an improvement of their thermal stability as evidenced by TGA. The wettability of the nanocomposite films is also studied by contact angle measurements with water. The incorporation of organomodified clays not only increases the hydrophobicity of the fluorinated polymers but also improves the surface properties of obtained nanocomposites. Compared the virgin homopolymer, the mechanical properties of the nanocomposites are reduced by addition of organomodifed clay at temperature from 30 to 60 8C, whereas this trend is gradually decreased at higher temperature.

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Section: Resultsmentioning

confidence: 99%

Preparation of fluorinated methacrylate/clay nanocomposite via in‐situ polymerization: Characterization, structure, and properties

Karamane

Raihane

Taşdelen

et al. 2016

J. Polym. Sci. Part A: Polym. Chem.

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“…In the case of nanocellulose-stabilized o/w Pickering emulsion, the surface charge on nanocelluloses can effectively improve the emulsion stability due to the electrostatic repulsion between the droplets . On the other hand, the hydrophilicity of the stabilizer nanomaterials should be optimum to keep them specifically at the oil–water interface providing better stabilization. − Thus, the surface charge on nanocellulose has significant role to stabilize o/w emulsion. For example, CNCs with very high surface charge density (>0.03 e/nm 2 ) are unable to stabilize o/w emulsion .…”

Section: Resultsmentioning

confidence: 99%

Scalable Pickering Stabilization to Design Cellulose Nanofiber-wrapped Block Copolymer Microspheres for Thermal Energy Storage

Chakrabarty

Teramoto

2020

ACS Sustainable Chem. Eng.

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The only limitation to scale up the preparation of Pickering emulsion is the ultrasonication step. In this study, a scalable ultrasound-free approach was adopted to make a stable oil-in-water (o/w) Pickering emulsion using cationic cellulose nanofibers (cNFs) as a stabilizer. The formation and stability of the emulsions were entirely dependent on the degree of cationic substitution (DS) in cNFs. Using such emulsions, we developed an aqueous dispersion of block copolymer (BCP)/cNF nanocomposite having the ability to store thermal energy. The BCP was prepared by reversible addition–fragmentation chain transfer (RAFT) polymerization of stearyl methacrylate (SMA) followed by the polymerization of methyl methacrylate (MMA) in cNF-stabilized Pickering emulsion. The polySMA (PSMA) segment in the nanocomposite exhibited the ability to absorb and release thermal energy due to the side-chain melting and crystallization. The stability of the Pickering emulsion and nanocomposite latex along with the respective yields were greatly dependent on the DS in cNFs. Interestingly, the cNF-stabilized BCPs had the crystalline melting at 34–37 °C and crystallization at 22–28 °C with 12-fold higher latent heat than the BCP stabilized by sodium dodecylsulfate (SDS), a conventional surfactant.

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“…In addition, owing to the low polarizability and strong electro-negativity of fluorine atoms, fluorine-containing polymer exhibits various merits, such as unique surface and optical properties, high thermal, chemical, and weather resistance [ 2 , 12 , 13 ]. Therefore, it has been widely applied to material coating [ 14 , 15 , 16 , 17 ] and many studies on hydrophobic coatings have focused on silica- and fluorine-modified acrylic polymers [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrophobicity of Polyacrylate Emulsion Film Enhanced by Introduction of Nano-SiO2 and Fluorine

Chen

et al. 2019

Polymers

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This study proposes to utilize modified Nano-SiO2/fluorinated polyacrylate emulsion that was synthesized with a semi-continuous starved seed emulsion polymerization to improve the hydrophobicity, thermal stability, and UV-Vis absorption of polyacrylate emulsion film. To verify the proposed method, a series inspection had been conducted to investigate the features of the emulsion film. The morphological analysis indicated that Nano-SiO2 was surrounded by a silane molecule after modification, which can efficiently prevent silica nanoparticles from aggregating. Fourier transform infrared spectra confirmed that modified SiO2 and dodecafluoroheptyl methacrylate (DFMA) were successfully introduced to the copolymer latex. The particle size of latex increased with the introduction of modified Nano-SiO2 and DFMA. UV-Vis absorption spectra revealed that modified silicon nanoparticles can improve the ultraviolet shielding effect obviously. X-ray photoelectron spectroscopy illustrated that the film–air interface was richer in fluorine than film section and the glass side. The contact angle of modified Nano-SiO2/fluorinated polyacrylate emulsion containing 3 wt % DFMA was 112°, slightly lower than double that of polyacrylate emulsion, indicating composite emulsion films possess better hydrophobicity. These results suggest that introducing modified Nano-SiO2 and fluorine into polyacrylate emulsion can significantly enhance the thermal stability of emulsion films.

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Nanoclay stabilized Pickering miniemulsion of fluorinated copolymer with improved hydrophobicity via RAFT polymerization

Abstract: Fluoropolymer/clay nanocomposite with improved polymer–clay interaction via electrostatic attraction was prepared by Pickering miniemulsion polymerization.

Cited by 14 publications

References 35 publications

Preparation of fluorinated methacrylate/clay nanocomposite via in‐situ polymerization: Characterization, structure, and properties

Preparation of fluorinated methacrylate/clay nanocomposite via in‐situ polymerization: Characterization, structure, and properties

Scalable Pickering Stabilization to Design Cellulose Nanofiber-wrapped Block Copolymer Microspheres for Thermal Energy Storage

Hydrophobicity of Polyacrylate Emulsion Film Enhanced by Introduction of Nano-SiO2 and Fluorine

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