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Chu G.-H.,Beijing University of Chemical Technology | Chu G.-H.,University of Jinan | Chu G.-H.,Shandong Engineering Research Center for Fluorinated Material | Li H.,University of Jinan | And 5 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2011

The FEP fibers treated by air plasma were characterized by DSC, SEM and XPS. The contact angle of FEP fiber against water was measured. The results of DSC showed that the crystallinity of FEP fiber was not affected by air plasma treatment. The surface morphology became rough after plasma treatment. The atomic content of O has increased 4.65%. The atomic content of F reduced 4.37%. The cleavage of C-F caused by plasma etch induced the atomic content ratio of O/C and F/C changed from 0.19 and 0.28 to 0.25 and 0.22 respectively. The contact angle against water of FEP fiber decreased from 112.3 to 54.1° after the plasma treatment. The hydrophilicity of the FEP fiber was enhanced remarkably through air plasma treatment. Source


Zhang L.,Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials | Zhang L.,University of Jinan | Zhang L.,Shandong Engineering Research Center for Fluorinated Material | Shi J.,Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials | And 11 more authors.
Journal of Surfactants and Detergents | Year: 2012

Two environmentally friendly succinic acid monofluoroalkyl sulfonate surfactants were synthesized from maleic anhydride and polyethylene glycol mono (1 H,1 H,7 H-dodecafluoroheptyl) ether, i.e. H(CF 2) 6CH 2OCH 2CH 2OCOCH(SO 3Na)CH 2COOH (FEOS-1) and H(CF 2) 6CH 2(OCH 2CH 2) 3OCOCH(SO 3Na)CH 2COOH (FEOS-3). The obtained surfactants were characterized by FT-IR, 1H NMR, 13C NMR and 19F NMR in detail. The synthesized fluorinated surfactants have a high thermal stability on the basis of thermogravimetric analysis. Their surface properties were examined and the results show that FEOS-1 and FEOS-3 surfactants can reduce the surface tension of water to 25.55 mN m -1 at 10.25 mmol L -1 and 21.63 mN m -1 at 8.33 mmol L -1, respectively; meanwhile, the introduction of oxyethylene groups enhances the hydrophilicity and micellar forming ability and the longer oxyethylene chains the better surface properties. The Krafft points (K p) of FEOS-1 and FEOS-3 were both below 0 °C, which was lower than perfluoro-n-heptanesulfonic acid sodium salt (n-C 7F 15SO 3Na, K p = 56.5 °C) at a similar length of fluorocarbon chains. Comparison studies on two surfactants above and the conventional fluorocarbon surfactants, perfluorooctanoate of ammonium (PFOA) show that the surfactants have comparable properties to PFOA, thus offering an environmentally friendly synthesizing alternatives to PFOA. © 2012 AOCS. Source


Zhang L.,University of Jinan | Zhang L.,Shandong Engineering Research Center for Fluorinated Material | Geng B.,University of Jinan | Geng B.,Shandong Engineering Research Center for Fluorinated Material | And 6 more authors.
Journal of Surfactants and Detergents | Year: 2016

In this study, four environmentally friendly succinic acid double-tailed sulfonate fluorinated surfactants were synthesized from maleic anhydride, fluoroalkyl alcohols, namely 1-(1H,1H,7H-Dodecafluoroheptyloxy) ethanol, 1-(1H,1H,5H -octafluoropentyloxy) ethanol, 1-(1H,1H,3H-tetrafluoropropoxy) ethanol, and 1-(1H,1H -trifluoroethyoxy) ethanol, and sodium hydrogensulfite. The surfactant structure was characterized by FT-IR, 1H NMR, and 19F NMR . Thermogravimetric results showed that the fluorinated surfactants were stable up to relatively high temperature. The Krafft points of the four novel succinic acid double-tailed sulfonate fluorinated surfactants were all below 0 °C. The lowest CMC value for the synthesized four double-tailed fluorine surfactants is about 0.076 mmol L−1, far less than that of ammonium perfluorooctanoate (PFOA), demonstrating that double-tailed surfactants have higher surface activity than surfactants with one fluoroalkyl chain. The replacement of alkyl groups with oxyethylene groups enhances the hydrophilicity of the obtained fluorinated surfactants. Based on these findings, the synthesized surfactants may be environmentally friendly alternatives to PFOA and exhibit promising potential in industry applications. © 2016 AOCS Source


Yin C.,Shandong Key Laboratory of Fluorine Chemistry and Chemical Materials | Yin C.,University of Jinan | Yin C.,Shandong Engineering Research Center for Fluorinated Material | Xu A.,Shandong Key Laboratory of Fluorine Chemistry and Chemical Materials | And 14 more authors.
Particuology | Year: 2015

Abstract Slightly crosslinked monodisperse poly(maleic anhydride-cyclohexyl vinyl ether-divinylbenzene) (MA-CHVE-DVB) microspheres were prepared via precipitation polymerization while using 2,2-azobisisobutyronitrile as an initiator in a mixture of methyl ethyl ketone and n-heptane without any stabilizer. The number-average diameter of the resultant poly(MA-CHVE-DVB) microspheres ranged from 0.478 to 1.386 μm with a polydispersity index of 1.00 to 1.02 that depended on the feed ratios of the MA/CHVE/DVB monomers. The introduction of one electron donor monomer cyclohexyl vinyl ether strongly affected the yield, size, and morphology of these slightly crosslinked microspheres. Quinoline-type chelating resins were obtained after combining the poly(MA-CHVE-DVB) with 8-hydroxyquinoline; the adsorption properties of these materials were measured through their ability to remove Cu2+ ions from water. The poly(MA-CHVE-DVB) microspheres with low degrees of crosslinking provided more effective functional groups and therefore better ion removal capabilities. These slightly crosslinked microspheres may have applications in water treatment as well as in sensing and drug delivery. © 2014 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved. Source


Wang Q.,University of Jinan | Wang Q.,Shandong Engineering Research Center for Fluorinated Material | Zhang S.,University of Jinan | Zhang S.,Shandong Engineering Research Center for Fluorinated Material | And 8 more authors.
Journal of Surfactants and Detergents | Year: 2012

Two novel environmentally friendly fluorinated surfactants, disodium monofluoroalkyl phosphates were synthesized using phosphorus pentoxide, i.e. H(CF 2) 6 CH 2OPO(ONa) 2 and H(CF 2) 6CH 2OCH 2CH 2OPO(ONa) 2. The novel synthesized fluorinated surfactants have a high thermal stability on the basis of Thermogravimetric Analysis. Their surface properties were also examined with the aim to have similar surface tensions of dilute aqueous solutions when compared with the conventional fluorocarbon surfactants, ammonium perfluorooctanoate. The two synthesized monofluoroalkyl phosphates can respectively reduce the surface tension of water to 23.73 mN/m at 78.3 mmol/L and 21.38 mN/m at 20.93 mmol/L. In addition, the Krafft points are both below 0°C. © AOCS 2011. Source

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