Liaoning High Performance Polymer Engineering Research Center

Dalian, China

Liaoning High Performance Polymer Engineering Research Center

Dalian, China

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Hu L.,State Key Laboratory of Fine Chemical | Hu L.,Liaoning High Performance Polymer Engineering Research Center | Hu L.,Liaoning Key Laboratory of Polymer Science and Engineering | Hu L.,Dalian University of Technology | And 9 more authors.
Applied Surface Science | Year: 2012

Novel thermally stable composite nanofiltration (NF) membranes were prepared from piperazine (PIP) and trimesoyl chloride (TMC) on poly (phthalazione ether nitrile ketone) (PPENK) ultrafiltration (UF) membranes by interfacial polymerization. The effects of monomers concentration, reaction time and organic solvents on the performance of composite membranes were investigated. The effects of operating pressure and the salt solution concentration on the performance of composite membranes were also discussed. The different salts rejection of PPENK composite membranes decreased in the order of Na 2SO 4 > MgSO 4 > Al 2(SO 4) 3 > NaCl > MgCl 2, which indicated a negative charge at the membrane surface. The flux and Na 2SO 4 rejection of PPENK composite membranes reached 57.9 L/m 2 h and 98.4% under the optimized conditions and operating pressure of 1.0 MPa. Furthermore, the morphology and chemical structure of membranes were examined by scanning electronic microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR), respectively. Moreover, the thermal stability of PPENK NF membranes was also investigated. When temperature of the feed solution raised from 20°C to 80°C, the permeation flux increased about four times without significant change of rejection. The flux increased first then reached a plateau and the rejection kept constant when PPENK NF membranes in boiling de-ionized water were boiled to 3 h. © 2012 Elsevier B.V. All rights reserved.


Han R.,Dalian University of Technology | Zhang S.,Dalian University of Technology | Zhang S.,State Key Laboratory of Fine Chemical | Zhang S.,Liaoning High Performance Polymer Engineering Research Center | And 5 more authors.
Journal of Membrane Science | Year: 2011

Copoly(phthalazinone biphenyl ether sulfone) (PPBES) with excellent performance is utilized to fabricate the substrate membrane of the composite nanofiltration (NF) membrane and the functional layer of the NF membrane is prepared by the interfacial polymerization from piperazine (PIP) and trimesoyl chloride (TMC). The performances of the substrate ultrafiltration (UF) membrane such as molecular weight cut-off (MWCO) and hydrophilicity are also studied to improve the composite membrane performance. When the composite membrane is prepared under optimized conditions and tested at 1.0MPa and 20°C, the flux of the composite NF membrane is about 77L/m2h and the Na2SO4 rejection of it is about 97.5%. The surface morphologies of the composite membrane and substrate membrane are observed by scanning electron microscopy (SEM). The flux is increased from 61 to 290L/m2h with the rejection of the membrane decreases 3.8% when the operation temperature increases from 18°C to 85°C at 1.0MPa. © 2011 Elsevier B.V.


Guan S.,Dalian University of Technology | Zhang S.,State Key Laboratory of Fine Chemical | Zhang S.,Liaoning High Performance Polymer Engineering Research Center | Zhang S.,Liaoning Key Laboratory of Polymer Science and Engineering | And 7 more authors.
Applied Surface Science | Year: 2014

Sulfonated copoly (phthalazinone biphenyl ether sulfone) (SPPBES) composite nanofiltration membranes were fabricated by adding low molecular weight additives into SPPBES coating solutions during a dip coating process. Three selected additives: glycol, glycerol and hydroquinone were used in this work. The effect of additives on the membrane performance was studied and discussed in terms of rejection and permeation flux. Among all the composite membranes, the membrane prepared with glycol as an additive achieved the highest Na 2SO4 rejection, and the membrane fabricated with glycerol as an additive exhibited the highest flux. The salts rejection of SPPBES composite membranes increased in the following order MgCl2 < NaCl ≤ MgSO4 < Na2SO4. The morphologies of the SPPBES composite membranes were characterized by SEM, it was found that the membrane prepared with hydroquinone showed a rough membrane surface. Composite membrane fabricated with glycol or glycerol as the additive showed very good chemical stability. © 2014 Elsevier B.V. All rights reserved.


Zhang B.,Dalian University of Technology | Zhang S.,Dalian University of Technology | Zhang S.,Liaoning Key Laboratory of Polymer Science and Engineering | Xing D.,Dalian University of Technology | And 5 more authors.
Journal of Power Sources | Year: 2012

To develop cost-effective membranes with low permeability of vanadium ions for vanadium redox flow battery (VRB) application, an inexpensive precursor membrane material, chloromethylated poly(phthalazinone ether ketone ketone), is first prepared from poly(phthalazinone ether ketone ketone) with nitrobenzene as the solvent, and then reacted with trimethylamine to form quaternized poly(phthalazinone ether ketone ketone) (QAPPEKK) anion exchange membranes. At an ion exchange capacity of 1.56 mmol g -1, the QAPPEKK membrane shows much lower permeability of vanadium ions (0.17 × 10 -4 cm min -1 for V 3+ and 0.21 × 10 -4 cm min -1 for VO 2+) than that of Nafion117 membrane (1.34 × 10 -4 cm min -1 for V 3+ and 1.19 × 10 -4 cm min -1 for VO 2+), resulting in higher coulombic efficiency (99.4% at 80 mA cm -2). In addition, the energy efficiency of the VRB with QAPPEKK membrane is comparable to that of VRB with Nafion117 membrane. Moreover, the QAPPEKK membrane is stable in VO2+ electrolyte, and exhibits good performance in the 100-cycle charge-discharge test of VRB. © 2012 Elsevier B.V. All rights reserved.


Han R.,Dalian University of Technology | Zhang S.,Dalian University of Technology | Zhang S.,State Key Laboratory of Fine Chemical | Zhang S.,Liaoning High Performance Polymer Engineering Research Center | And 7 more authors.
Journal of Membrane Science | Year: 2010

Novel copoly (phthalazinone ether sulfone) (PPBES) UF membranes with excellent performance were prepared with phase inversion method. The types of solvent, the effects of PPBES concentration, EGME concentration and coagulation temperature on the morphologies and performances of UF membrane were investigated in detail. The structures of the membrane were characterized by scanning electron microscope (SEM). With the increase of EGME concentration in the casting solution, the morphologies of the UF membrane changed from finger-like structure to sponge-like structure. The thermal stability of the PPBES UF membranes prepared in this work was investigated with Sulfur Black B dye solution. When the temperature of feed solution was raised from 20 to 95°C, the permeation flux increased more than three times while the rejection change was not observed. © 2010.

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