By a News Reporter-Staff News Editor at Journal of Technology -- Investigators publish new report on Purification Technology. According to news reporting from Hefei, People's Republic of China, by VerticalNews journalists, research stated, "Non-charged PVA-SiO2 hybrid membranes are prepared from the sol-gel reaction of polyvinyl alcohol (PVA) and methacryloxypropyl trimethoxy silane (gamma-MPS) or poly(gamma-MPS). As the polymerization degree increases from gamma-MPS to poly(gamma-MPS), the sol-gel solution becomes turbid or generates precipitation, while the formed silica particles in the hybrid membranes become smaller from 1.0-3.4 mu m to 0.1-0.2 mu m or disappear."
The news correspondents obtained a quote from the research from the Hefei University of Technology, "The membrane tensile strength (TS) generally increases from 35 MPa to 44 MPa, while the elongation at break (E-b) decreases from 318% to 141%. Three deductions are proposed according to the structure of poly(gamma-MPS), membrane swelling behaviors in 65-85 degrees C water and 65 degrees C alkaline solution, and the diffusion dialysis (DD) performance. (1) As poly(gamma-MPS) contains no ion-exchange groups like the multisilicon copolymer , it tends to become inhomogeneous during sol-gel process, which reduces its crosslinking ability. (2) The membrane structure is generally stable in 65 degrees C water with the swelling degrees of 140-347%, but is damaged in 85 degrees C water or 65 C alkaline solution. (3) Non-charged hybrid membranes can be potentially applied in DD process. The dialysis coefficient of NaOH (U-OH) is in the range of 0.0069-0.0127 m/h, and the separation factor (S) is in the range of 19-92."
According to the news reporters, the research concluded: "The OH- ions may be transferred in the hybrid membranes through PVA-OH groups and interstices between organic and inorganic phases, according to the mechanisms of adsorption-desorption and free diffusion, correspondingly."
For more information on this research see: Non-charged PVA-SiO2 hybrid membranes for potential application in diffusion dialysis. Separation and Purification Technology, 2013;118():359-368. Separation and Purification Technology can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Separation and Purification Technology - www.elsevier.com/wps/product/cws_home/600251)
Our news journalists report that additional information may be obtained by contacting Y.H. Wu, Hefei Univ Technol, Sch Chem Engn, Hefei 230009, People's Republic of China. Additional authors for this research include H.Y. Lin, G.C. Zhang, T.W. Xu and C.M. Wu.
Keywords for this news article include: Asia, Hefei, Purification Technology, People's Republic of China
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