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Shandong Dongyue Polymer Material Co. | Date: 2014-07-07

A zero polar distance ion exchange membrane. A polymer membrane is compositely prepared by a perfluorinated ion exchange resin and a reinforcing material, and the polymer membrane is converted into an ion exchange membrane. A non-electrode porous gas release layer is adhered to at least one side of the ion exchange membrane. The non-electrode porous gas release layer is formed by drying after adhering a dispersion liquid to an ion exchange membrane layer surface. The dispersion liquid is formed by dispersing perfluorinated sulphonic acid resin broken micro-particles in a sulphonic acid resin aqueous alcohol solution. The prepared zero polar distance ion exchange membrane is used in the chlor-alkali industry, stably and effectively treats an alkali metal chloride solution having a high impurity content, is able to better suited for operating in a zero polar distance electrolysis cell under high current density conditions, and has a very low surface resistance. Also provided is a preparation method for the zero polar distance ion exchange membrane. The preparation method has a simple and reasonable process, and facilitates industrial production.

Wang J.,Shanghai JiaoTong University | Wang X.,Shandong DongYue Polymer Material Co. | Dou P.,Shandong DongYue Polymer Material Co. | Zhang H.,Shandong DongYue Polymer Material Co. | Zhang Y.,Shanghai JiaoTong University
Polymer Engineering and Science | Year: 2015

A melt-extruded method has been used to prepare blend membranes of Perfluorosulfonic Acid Polymer (PFSA) and Perfluorocarboxylic Acid Polymer (PFCA) with different combination ratios. Fourier Transform Infrared (FT-IR) and X-ray Diffraction (XRD) analyses have showed that the chemical structure and crystallization behaviour of both polymers remained unchanged in the blend membrane, and the crystallinity has been increased for the blend membrane with a higher weight fraction of PFCA. According to the results obtained from Scanning Electron Microscope (SEM), PFSA and PFCA polymers are well compatible, forming mixed aggregates containing both sulphonyl and carboxyl ions. Surprisingly, a membrane containing a 50:50 ratio of PFSA/PFCA has showed microphase separation, and it possesses the smallest ionic cluster size among all the blend membranes prepared, as illustrated by the Small Angle X-Ray Scattering (SAXS) analysis. In addition, when the PFCA content was increased, the ion exchange capacity (IEC) for blend membranes remained the same, while their water uptake and proton conductivity have decreased rapidly. Compared with the PFSA/PFCA two-layered membrane, this PFSA/blend/PFCA membrane not only maintained respectable electrolysis property, also exhibited significantly higher peel strength, especially after the hydrolization process; plus, it has showed excellent resistance to the peeling damage under the operational conditions of chlor-alkali electrolytic cells. © 2014 Society of Plastics Engineers.

Zhao J.,Shanghai JiaoTong University | Xu A.,Shanghai JiaoTong University | Yuan W.Z.,Shanghai JiaoTong University | Gao J.,Zhengzhou University | And 4 more authors.
Journal of Materials Science | Year: 2011

Electrospinning performance of 5-52 wt% perfluorosulfonic acid (PFSA), poly (N-vinylpyrrolidone) (PVP), and PFSA/PVP blends in N,N-dimethylformamide (DMF) with various PFSA/PVP ratios were systematically investigated in respective of solutions properties, mainly surface tension and rheological properties. Mechanical relaxation time sM calculated from rheological results happens to be closely correlated with nanofiber morphology, and is used to evaluate the electrospinnability. Polymer solutions with higher sM show better electrospinnability. Morphologies of the electrospun samples were observed by Scanning electronic microscopy. The results show that the pure PFSA solutions, even with a quite high concentration up to 52 wt%, fail to be electrospun and possess a very low sM. Addition of PVP improves electrospinnability of PFSA and increases sM. The electrospinnability of PFSA/PVP/ DMF solutions can be manipulated by changing the ratio of PFSA to PVP and the total polymer concentration of the mixed solutions. The PFSA nanofiber mats with a small fraction of PVP (\8 wt%) with the average diameter of 370 nm were successfully obtained. © Springer Science+Business Media, LLC 2011.

Xu A.,Shanghai JiaoTong University | Zhao J.,Shanghai JiaoTong University | Yuan W.Z.,Shanghai JiaoTong University | Li H.,Shanghai JiaoTong University | And 3 more authors.
Macromolecular Chemistry and Physics | Year: 2011

Copolymerizations of tetrafluoroethylene (TFE) and perfluoro(3,6-dioxa-4- methyl-7-octen)sulfonyl fluoride (PSVE) initiated by bis(perfluoro-2-n- propoxypropionyl) peroxide in supercritical carbon dioxide are investigated. The reactivity ratios for TFE (rTFE) and PSVE (rPSVE) are calculated to be 7.85, 0.079 and 7.92, 0.087 according to Fineman-Ross and Kelen-Tudos methods, respectively. The glass transition temperatures of the copolymers increase with increasing in PSVE content. Comparison studies on above copolymers and another fluorinated sample prepared in emulsion show that the copolymers have comparable properties to the fluorinated one, thus offering an economic way to improve the properties of TFE-PSVE copolymers for their applications in diverse fields. A series of TFE-PSVE copolymers are synthesized in supercritical carbon dioxide (sc-CO2) using bis(perfluoro-2-n- propoxypropionyl) peroxide (BPPP) as the initiator. Copolymers with PSVE fractions varying from 5.6 to 18.6 mol-% are obtained in 12.6-66.3 mol-% yield. The copolymers have comparable properties to those of the fluorinated polymer prepared in emulsion, thus saving an expensive fluorination step. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Xu A.,Shanghai JiaoTong University | Yuan W.Z.,Shanghai JiaoTong University | Zhang H.,Shandong Dongyue Polymer Material Co. | Wang L.,Shandong Dongyue Polymer Material Co. | And 2 more authors.
Polymer International | Year: 2012

Low-molecular-weight (M n) polytetrafluoroethylene (PTFE) homopolymers were successfully prepared using a perfluorodiacyl initiator, bis(perfluoro-2-n-propoxypropionyl) peroxide, in supercritical carbon dioxide. Solid-state 19F NMR and Fourier transform infrared spectral analyses show that perfluoroalkyl end-groups are present in the resultant PTFEs. Thermogravimetric analysis suggests all polymers with various M n have outstanding thermal stability. Differential scanning calorimetry measurements indicate that both melting and crystallization transitions of PTFE shift to lower temperatures when M n decreases, because shorter polymer chains can move more easily at lower temperatures. Investigation of polymerization kinetics suggests that the rate law for the polymerization has kinetic orders of 0.5 and 1.0 with respect to initiator and monomer concentrations, indicating that termination occurs through coupling of propagating chains. Melt fusion crystallinity of as-polymerized PTFE can be as high as 86%, and the polymerization rate does not seem to be obviously affected by the total interphase area of the polymer phase, implying polymerization mainly occurs in the carbon dioxide-rich fluid phase; meanwhile, the low viscosity and high diffusivity of supercritical carbon dioxide mean that propagating chains have more opportunities to meet, thus yielding low-M n PTFEs. © 2012 Society of Chemical Industry.

Xu A.,Shanghai JiaoTong University | Yuan W.Z.,Shanghai JiaoTong University | Zhao J.,Shanghai JiaoTong University | Li H.,Shanghai JiaoTong University | And 2 more authors.
Journal of Applied Polymer Science | Year: 2012

Tetrafluoroethylene (TFE) and perfluoropropylvinyl ether (PPVE) were copolymerized in supercritical carbon dioxide (sc-CO 2) with a perfluorodiacyl initiator bis(perfluoro-2-n-propoxypropionyl) peroxide (BPPP). The resultant copolymers with stable perfluoroalkyl end groups were obtained, avoiding the decomposition during processing and applications. Reactivity ratios of TFE and PPVE were first reported. The r TFE and r PPVE values are about 8 and 0.08, respectively. Such parameters are significant for the modification of PTFE through copolymerization of TFE and PPVE. It is found that through increasing the reaction pressure from 8.5 to 25 MPa, while r TFE increases by 12.0%, r PPVE decreases by 9.0%, which should be ascribed to the enhancement of the polarity of CO 2 under high pressures. Because the reactivity of TFE is by two orders of magnitude higher than that of PPVE; on one hand, the copolymerization rate falls rapidly with the decrease of TFE feed ratio; on the other hand, TFE content in the copolymer decreases with the reaction time. All copolymers containing different fractions of PPVE enjoy outstanding thermal stability. The DSC result indicates that there exist two forms of crystals with highly regular molecular arrangement or less ordered chain packing which is disturbed by perfluoropropyl pendants. © 2011 Wiley Periodicals, Inc.

Wang X.-J.,Shandong Dongyue Polymer Material Co. | Fang S.-X.,Shandong Dongyue Polymer Material Co. | Zhang Y.-M.,Shandong Dongyue Polymer Material Co. | Zhang Y.-M.,Shanghai JiaoTong University
Xiandai Huagong/Modern Chemical Industry | Year: 2013

Statistical research on fluorine containing products and materials is performed. Based on the statistical data of issued-patents, the national standards of fluorine containing materials are analyzed. The standards of fluorinated materials are mainly focused on PTFE and its application, while the standards of basic fluorine containing products are focused on properties and analytical methods. The statements of fluorine industry and standardization work in the "Twelfth Five-Year Guideline" are summarized and the problems in standard setting are discussed. It is pointed out that technical patent and standardization of patent are an effective way to promote the technical innovation and achievement transformation.

Wang L.,Shandong Huaxia Shenzhou New Material Co. | Wang X.-J.,Shandong Dongyue Polymer Material Co. | Chen Y.,Shandong Huaxia Shenzhou New Material Co.
Xiandai Huagong/Modern Chemical Industry | Year: 2013

The current progresses of perfluorinated ion exchange resin at home and abroad are reviewed. The preparation of new fluoromonomers and new fluoropolymeric resins and their development directions are introduced. The prospects of the research and application of perfluorinated ion exchange resin are proposed as well.

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