Enhancing the low surface energy properties of polymer films with a dangling shell of fluorinated block-copolymer

“…To investigate the water repellency of the prepared copolymer when applied to the conservation of stone building heritages, the contact angle test of the copolymer lm were conducted. Previous scholars have con rmed that − CF 3 group is capable of enhancing the hydrophobicity of a copolymer lm surface [28,[35][36][37]. This is because the polar OH − groups of the stone surface are replaced by the non-polar and thermally stable -CF 3 groups originating from the uorinated copolymer [38], impelling the formation of a hydrophobic surface on the stone building heritage [36].…”

Section: Contact Angle Of the Copolymermentioning

confidence: 99%

Preparation, characterization and application of fluorinated acrylate copolymer emulsion for the conservation of stone building heritages in Putuo Zongcheng Temple, China

Chang

Cao

Wang

2020

Preprint

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Recently, the stone building heritages in Putuo Zongcheng Temple are experiencing a certain degree of weathering damage, which mainly manifests in the blistering, fissuring, flaking and detachment of the carved balustrades of stone bridge, the footings of wall, the front paws and pedestals of stone lions. To prevent the deterioration of the stone building heritages, the fluorinated acrylate copolymer emulsion was successfully prepared with ethyl metrhacrylate, n-butyl acrylate and 2,2,3,4,4,4-hexafluorobutyl methacrylate as monomers. The structure and surface morphology characteristics of this copolymer were described the Fourier Transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM), respectively. The FTIR spectra confirms that the adopted monomers have been involved in during the copolymer polymerization process. The SEM images reveal that the surface of the prepared copolymer is obviously more dense, compact and smooth than the porous structure of stone building heritages. The ageing resistance of the copolymer was quantitatively studied by the ultraviolet aging test, the contact angle and imbibition spontaneous tests were adopted to estimate the wettability alteration of the copolymer emulsion for the stone samples. Results show that the mass loss rate of the prepared copolymer increases rapidly and then tends to be stable when irradiated by ultraviolet light. And the fluorinated copolymer with 16.65% HFMA content possesses the optimal ageing resistance and the superb hydrophobicity. The contact angles of the coated stone samples range from 91.90o to 119.80o, which are all larger than 18.80o-69.05o of the un-coated samples. Similarly, the spontaneous imbibition test also ensures that, both the maximum water absorption capacity and the imbibition equilibrium time of the samples treated by this copolymer emulsion are lesser. Considering the influence of water on rock weathering, the fluorinated copolymer emulsion coating is an potential method to avoid the degrading of stone building heritages, because it depresses the infiltration of water and then avoids or weakens the dissolution effect, salt crystallization, water absorption swelling and freeze-thaw weathering.

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“…Due to the extremely small atomic radius of the fluorine atoms as well as the short bond length and high bond energy of the C F covalent bond, the fluoropolymers exhibit many extraordinary properties, such as high thermal stability, chemical resistance and superhydrophobicity. [11][12][13][14] These characteristics enable their application in strongly acidic and high temperature environments. Overall, the porous fluoropolymer materials have attracted an enormous attention owing to their unique properties.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of hierarchical porous fluoro‐PolyHIPE materials with ultra‐high specific surface area via hypercrosslinking knitting technique

Lin

Xia

Liu

et al. 2022

J of Applied Polymer Sci

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Fluoro‐PolyHIPEs with porous structure exhibit an excellent weather resistance for adsorption, separation or catalyst support applications in extreme environments, however, the specific surface area still needs to be improved. In this study, a porous fluorinated material is prepared by using high internal phase emulsion template method, and the porous structure of fluoro‐PolyHIPE (F‐PolyHIPE) is subsequently excavated and modified by the hypercrosslinking “knitting” method. The “knitting” of micropores in the pore walls of the fluoropolymer is achieved through the Friedel‐Crafts alkylation reaction by using dimethoxymethane (FDA) as the external crosslinker. It transforms the macroporous fluoropolymer prepared based on HIPE emulsion template method into hierarchical porous fluoro‐PolyHIPE (HCPF‐PolyHIPE) with a high specific surface area. The specific surface area of the porous fluorinated material demonstrates an increment from 15.6 m2 g−1 to 353.2 m2 g−1 after hypercrosslinking. Owing to the introduction of the micropores and mesopores as well as the enrichment of the fluorine atoms in the polymer network, HCPF‐PolyHIPE can be successfully applied for CO2 adsorption, thus, representing a major achievement of the study. Moreover, HCPF‐PolyHIPE exhibits excellent thermal stability as well as acid and alkali resistance, thus, confirming potential application prospects in the fields of oil‐water separation and gas adsorption.

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Enhancing the low surface energy properties of polymer films with a dangling shell of fluorinated block-copolymer

Cited by 22 publications

References 41 publications

Highly porous and chemical resistive P(TFEMA–DVB) monolith with tunable morphology for rapid oil/water separation

Highly porous and chemical resistive P(TFEMA–DVB) monolith with tunable morphology for rapid oil/water separation

Preparation, characterization and application of fluorinated acrylate copolymer emulsion for the conservation of stone building heritages in Putuo Zongcheng Temple, China

Fabrication of hierarchical porous fluoro‐PolyHIPE materials with ultra‐high specific surface area via hypercrosslinking knitting technique

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