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Sui Zhao - One of the best experts on this subject based on the ideXlab platform.
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interfacial dilational properties of di substituted alkyl benzene Sulfonates at kerosene water and crude oil water interfaces
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2017Co-Authors: He Zhou, Lu Zhang, Qing Luo, Qingtao Gong, Ziyu Liu, Miao Liu, Lei Zhang, Sui ZhaoAbstract:Abstract In this research, the interfacial properties of di-substituted alkyl benzene Sulfonates at kerosene/water and daqing crude oil/water interfaces have been studied by interfacial tension and interfacial dilational rheological measurements. The experimental results show that the di-substituted alkyl benzene Sulfonates can obviously lower the interfacial tensions of kerosene/water and daqing crude oil/water interfaces. The mixed adsorption of active components with Sulfonate molecules will reduce or improve interfacial tension at low or high surfactant concentration respectively. Moreover, the adsorption layers formed by di-substituted alkyl benzene Sulfonate molecules shows high value of modulus at kerosene/water interface due to the strong interactions among long alkyl chains. However, the mixed adsorption of active components with Sulfonate molecules will destroy the tight arrangement of surfactant molecules and result in the obvious decrease of modulus. The possible mechanism has been proposed and ensured by modulus-interfacial pressure curves.
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interfacial dilational properties of tri substituted alkyl benzene Sulfonates at air water and decane water interfaces
Journal of Colloid and Interface Science, 2008Co-Authors: Lei Zhang, Lu Zhang, Sui Zhao, Qingtao Gong, Xiaochun Wang, Jiayong YuAbstract:Abstract The dilational rheological properties of absorbed film of three pairs of structural isomers, tri-substituted alkyl benzene Sulfonates, at the air–water and decane–water interfaces have been investigated by drop shape analysis method. The influences of bulk concentration on dilational elasticity and viscosity were expounded. Interfacial tension relaxation method was employed to obtain dilational parameters in a reasonably broad frequency range. The experimental results showed that the meta-alkyl to Sulfonate group plays a crucial role in the interfacial dilational properties: the longer meta-alkyl will lead to higher dilational parameters for air–water interface and lower ones for decane–water interface when the total alkyl carbon numbers are equal. For alkyl benzene Sulfonates with shorter meta-alkyl, the surface dilational properties are similar to interfacial dilational properties, whereas the surface dilational parameters are obviously higher than the interfacial dilational parameters for alkyl benzene Sulfonates with longer meta-alkyl in general. The possible mechanism has been proposed and ensured by Cole–Cole plots.
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studies of synergism for lowering dynamic interfacial tension in sodium α n alkyl naphthalene Sulfonate alkali acidic oil systems
Journal of Colloid and Interface Science, 2004Co-Authors: Yanping Chu, Yong Gong, Xiaoli Tan, Lu Zhang, Sui ZhaoAbstract:Alkylnaphthalene Sulfonates with high purity were selected as model components to research synergism for lowering interfacial tension (IFT) in surfactant/alkali/acidic oil systems. The dynamic IFTs between alkylnaphthalene Sulfonates with different alkyl chain length and n-decane, oleic acid model oil, or Shengli crude oil were measured. The results showed that the alkylnaphthalene Sulfonates with different alkyl chain lengths had different synergism with different acidic components and their ionized acids under the same conditions. The synergism for lowering dynamic IFT in alkylnaphthalene Sulfonate/alkali/acidic oil systems was controlled by alkylnaphthalene Sulfonate concentration, alkyl chain length, alkali concentration, alkali type, and oleic acid concentration: optimal physicochemical conditions were necessary to the best synergism. This indicates that the synergism among added surfactant acidic components in crude oil and their ionized acids is controlled by the ratio of their interfacial concentrations.
Jochen Kerres - One of the best experts on this subject based on the ideXlab platform.
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blended and cross linked ionomer membranes for application in membrane fuel cells
Fuel Cells, 2005Co-Authors: Jochen KerresAbstract:Differently cross-linked blend membranes were prepared from commercial arylene main-chain polymers of the poly(etherketone) and poly(ethersulfone) classes, modified with Sulfonate groups, sulfinate cross-linking groups, and basic N-groups. The following membrane types have been prepared: (i) Van-der Waals/dipole-dipole blends by mixing a polySulfonate with unmodified PSU. This membrane type showed a heterogeneous morphology, leading to extreme swelling and even dissolution of the Sulfonated component at elevated temperatures. (ii) Hydrogen bridge blends by mixing a polySulfonate with a polyamide or a polyetherimide. This membrane type showed a partially heterogeneous morphology, also leading to extreme swelling/dissolution of the Sulfonated blend component at elevated temperatures. (iii) Acid-base blends by mixing a polySulfonate with a polymeric N-base (in-house developed/commercial). A wide range of properties could be achieved with this membrane type by variation of the different parameters. Membranes showing excellent stability and good fuel cell performance up to 100 °C (PEFC) and 130 °C (DMFC) were obtained. (iv) Covalently cross-linked (blend) membranes by either mixing a polySulfonate with a polysulfinate or by preparing a polysulfinateSulfonate, followed by reaction of the sulfinate groups in solution with a dihalogeno compound under S-alkylation. The membranes prepared showed effective suppression of swelling without a loss in the H+-conductivity. The membranes showed good PEFC (up to 100 °C) and DMFC (up to 130 °C) performance. (v) Covalent-ionically cross-linked blend membranes by mixing polySulfonates with polysulfinates and polybases or by mixing a polySulfonate with a polymer carrying both sulfinate and basic N-groups. The covalent-ionically cross-linked membranes were tested in a DMFC up to 110 °C and demonstrated good performance. (vi) Differently cross-linked organic-inorganic blend composite membranes via various procedures. The best results were obtained with blend membranes having a layered zirconium phosphate “ZrP” phase: they were transparent, and showed good H+-conductivity and stability. The application of one of these composite membranes in a PEFC yielded good performance up to T = 115 °C.
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development and characterization of crosslinked ionomer membranes based upon sulfinated and Sulfonated psu crosslinked psu blend membranes by alkylation of sulfinate groups with dihalogenoalkanes
Journal of Membrane Science, 1998Co-Authors: Jochen Kerres, Wei Cui, Martin JungingerAbstract:Crosslinked Sulfonated PSU blend membranes have been produced via a new crosslinking process. The blends have been obtained from mixing of PSU Udeltm Na-Sulfonate and PSU Udeltm Li-sulfinate in N-methyl pyrrolidone. The membranes have been crosslinked by S-alkylation of PSU sulfinate groups with dihalogenoalkanes The membranes produced via this process have been characterized in terms of ion-exchange capacity, electric resistance, swelling, ion-permselectivity. In addition, the thermal stability of the membranes has been determined by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), and FTIR-spectra of the prepolymers and of the crosslinked blend membranes have been recorded. The new crosslinking procedure shows following advantages: (i) the preparative effort for crosslinking is very low; (ii) the properties of the crosslinked membranes are reproducible; (iii) the crosslinking proceeds with a high yield when applying suitable dihalogenoalkanes or other crosslinkers which are capable to S-alkylate the sulfinate group. The properties of the crosslinked PSU blend membranes are: (i) low electrical resistance at high IEC's; (ii) low swelling rate in practical temperature ranges from 20–70°C; (iii) excellent hydrolysis stability; (iv) excellent thermal stability.
Stephen Caddick - One of the best experts on this subject based on the ideXlab platform.
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tributyltin hydride and 1 ethylpiperidine hypophosphite mediated intermolecular radical additions to 2 4 6 trichlorophenyl vinyl Sulfonate
Tetrahedron Letters, 2007Co-Authors: Oluwabusola Edetanlenelliot, Jonathan D. Wilden, Richard J Fitzmaurice, Stephen CaddickAbstract:2,4,6-Trichlorophenyl vinyl Sulfonate smoothly undergoes intermolecular radical addition under mild initiation conditions mediated by tributyltin hydride and 1-ethylpiperidine hypophosphite (EPHP) to generate a range of functionalised alkyl sulfonamide precursors. This methodology can be used to prepare bifunctional pentafluorophenyl/2,4,6-trichlorophenyl Sulfonates in good yields.
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rate enhancement of pfp Sulfonate ester aminolysis by chloride salts in organic and aqueous media
Tetrahedron Letters, 2005Co-Authors: Jonathan D. Wilden, Duncan Bruce Judd, Stephen CaddickAbstract:We report here, a method of accelerating the rate of aminolysis of PFP Sulfonates to yield sulfonamides using tetrabutylammonium salts. We have previously explored the utility of employing PFP Sulfonates in the formation of sulfonamides; however we demonstrate here the advantages of combining the existing methodology with a revised protocol which allows the diversity within both the Sulfonate ester and the amine to be extended.
Lu Zhang - One of the best experts on this subject based on the ideXlab platform.
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interfacial dilational properties of di substituted alkyl benzene Sulfonates at kerosene water and crude oil water interfaces
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2017Co-Authors: He Zhou, Lu Zhang, Qing Luo, Qingtao Gong, Ziyu Liu, Miao Liu, Lei Zhang, Sui ZhaoAbstract:Abstract In this research, the interfacial properties of di-substituted alkyl benzene Sulfonates at kerosene/water and daqing crude oil/water interfaces have been studied by interfacial tension and interfacial dilational rheological measurements. The experimental results show that the di-substituted alkyl benzene Sulfonates can obviously lower the interfacial tensions of kerosene/water and daqing crude oil/water interfaces. The mixed adsorption of active components with Sulfonate molecules will reduce or improve interfacial tension at low or high surfactant concentration respectively. Moreover, the adsorption layers formed by di-substituted alkyl benzene Sulfonate molecules shows high value of modulus at kerosene/water interface due to the strong interactions among long alkyl chains. However, the mixed adsorption of active components with Sulfonate molecules will destroy the tight arrangement of surfactant molecules and result in the obvious decrease of modulus. The possible mechanism has been proposed and ensured by modulus-interfacial pressure curves.
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interfacial dilational properties of tri substituted alkyl benzene Sulfonates at air water and decane water interfaces
Journal of Colloid and Interface Science, 2008Co-Authors: Lei Zhang, Lu Zhang, Sui Zhao, Qingtao Gong, Xiaochun Wang, Jiayong YuAbstract:Abstract The dilational rheological properties of absorbed film of three pairs of structural isomers, tri-substituted alkyl benzene Sulfonates, at the air–water and decane–water interfaces have been investigated by drop shape analysis method. The influences of bulk concentration on dilational elasticity and viscosity were expounded. Interfacial tension relaxation method was employed to obtain dilational parameters in a reasonably broad frequency range. The experimental results showed that the meta-alkyl to Sulfonate group plays a crucial role in the interfacial dilational properties: the longer meta-alkyl will lead to higher dilational parameters for air–water interface and lower ones for decane–water interface when the total alkyl carbon numbers are equal. For alkyl benzene Sulfonates with shorter meta-alkyl, the surface dilational properties are similar to interfacial dilational properties, whereas the surface dilational parameters are obviously higher than the interfacial dilational parameters for alkyl benzene Sulfonates with longer meta-alkyl in general. The possible mechanism has been proposed and ensured by Cole–Cole plots.
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studies of synergism for lowering dynamic interfacial tension in sodium α n alkyl naphthalene Sulfonate alkali acidic oil systems
Journal of Colloid and Interface Science, 2004Co-Authors: Yanping Chu, Yong Gong, Xiaoli Tan, Lu Zhang, Sui ZhaoAbstract:Alkylnaphthalene Sulfonates with high purity were selected as model components to research synergism for lowering interfacial tension (IFT) in surfactant/alkali/acidic oil systems. The dynamic IFTs between alkylnaphthalene Sulfonates with different alkyl chain length and n-decane, oleic acid model oil, or Shengli crude oil were measured. The results showed that the alkylnaphthalene Sulfonates with different alkyl chain lengths had different synergism with different acidic components and their ionized acids under the same conditions. The synergism for lowering dynamic IFT in alkylnaphthalene Sulfonate/alkali/acidic oil systems was controlled by alkylnaphthalene Sulfonate concentration, alkyl chain length, alkali concentration, alkali type, and oleic acid concentration: optimal physicochemical conditions were necessary to the best synergism. This indicates that the synergism among added surfactant acidic components in crude oil and their ionized acids is controlled by the ratio of their interfacial concentrations.
Zhenhua Jiang - One of the best experts on this subject based on the ideXlab platform.
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novel wholly aromatic Sulfonated poly arylene ether copolymers containing sulfonic acid groups on the pendants for proton exchange membrane materials
Macromolecules, 2007Co-Authors: Jinhui Pang, Haibo Zhang, Xuefeng Li, Zhenhua JiangAbstract:A series of novel wholly aromatic Sulfonated poly(arylene ether) copolymers containing sulfonic acid groups on the pendants [SC-SPAE, i.e., side-chain-type Sulfonated poly(arylene ether)] were prepared by direct copolymerization of Sulfonated monomer [sodium 4-(4-(2,6-difluorobenzoyl)phenoxy) benzenesufonate (SDFBS)], 4,4‘-dichlorodiphenyl sulfone (DCDPS), and 4,4‘-dihydroxyldiphenylether (DHDPE). The Sulfonate degree (DS) of the copolymers was readily controlled by adjusting the feed ratio of SDFBS to DCDPS. Structures of the Sulfonated copolymers were confirmed by FT-IR and NMR. Tough and flexible films of the wholly aromatic copolymers with good thermal and oxidative stability were obtained by solvent cast process in N,N-dimethylacetamide (DMAc) solution. The films of these side-chain-type copolymers show good dimensional stability, and their water uptake and swelling ratios at high temperature are lower than those of the main-chain-type Sulfonated poly(arylene ether) with similar ion exchange capacity...
