02083nas a2200241   4500008004100000022001400041245008800055210006900143260006800212300001400280490000700294520122900301653003201530653001401562653001001576653002401586653002401610100001901634700001901653700002501672700002401697856012001721       2005                        eng d  a0887-626600aPoly(acrylonitrile) ultrafiltration membranes. I. polymer-salt-solvent interactions0 aPolyacrylonitrile ultrafiltration membranes I polymersaltsolvent  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcAUG  a2061-20730 v433 a<p>Fourier transform infrared spectroscopy was used to study the interactions among LiCl, ZnCl2, and AlCl3 with NN-dimethylformamide (DMF) and poly (acrylonitrile) (PAN). It was observed that all three salts complex with DMF as well as PAN. The strength of the cation interaction with the &gt; C=O oxygen of DMF was found to be higher than that with the -CN group of PAN. The &gt; C=O stretching frequency of DMF with ZnCl2 was red shifted, indicating stronger complex formation compared with other two cations. With the addition of salt, the salt-DMF pseudo solvent was found to become a 0 solvent for PAN compared with neat DMF. This change in PAN solvation power was primarily the result of DMF-salt complexation. As a result of the complexation, Mark-Houwink constant a, was found to reduce from 0.75 (for pure DMF) to similar to 0.6 for DMF-salt solvents, indicating decreased PAN chain expansion. Comparison of intrinsic viscosity [n] values indicated that addition of salts to PAN-DMF solutions resulted in: (i) decrease in the DMF solvation. power, which causes less expanded polymer coils, and (ii) increased interpolymer chain entanglements via salt-promoted chain association. (c) 2005 Wiley Periodicals, Inc.</p>10aactivation energy viscosity10aAdditives10aFT-IR10aPoly(acrylonitrile)10asolution properties1 aPhadke, M., A.1 aMusale, D., A.1 aKulkarni, Sudhir, S.1 aKarode, Sandeep, K.  uhttp://library.ncl.res.in/content/polyacrylonitrile-ultrafiltration-membranes-i-polymer-salt-solvent-interactions-102307nas a2200241   4500008004100000022001400041245009600055210006900151260007300220300001000293490000800303520143000311653001301741653002301754653002401777653002701801653002001828100002701848700002201875700002001897700002201917856012601939       2011                        eng d  a0011-916400aPoly(acrylonitrile) based ultrafiltration membranes: optimization of preparation parameters0 aPolyacrylonitrile based ultrafiltration membranes optimization o  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV  a46-530 v2823 a<p>Supported ultrafiltration (UF) membranes based on poly(acrylonitrile) were prepared while varying crucial parameters responsible for controlling membrane porosity, viz.; polymer concentration, solvent and additives in the dope solution. Insight into membrane porosity and morphology was obtained by water flux, solute rejection, bubble point, pore size distribution, SEM and AFM analyses. It was found that merely increasing polymer concentration does not necessarily reduce pore size of membranes. Among four solvents used for the dope solution preparation, N-methyl pyrrolidone was found to offer membranes with optimal combination of flux and rejection of various solutes. Some of the PAN(17) (17% w/w PAN concentration in the dope solution) membranes prepared using organic acid as the additive (citric acid, tartaric acid or maleic acid) offered 1.2-1.7 times higher flux than the membrane prepared using inorganic salt, ZnCl2 as an additive. The porosity of PAN(17) membrane prepared using CA as an additive was larger as compared to membrane prepared using ZnCl2 as an additive. Atomic force microscopy (AFM) analysis of this membrane exhibited higher surface roughness as compared to the ZnCl2 based membrane. Both these membranes exhibited bacteria (E. Coli) log reduction value (LRV) of at least 6; depicting applicability of these membrane for water disinfection. (C) 2011 Elsevier B.V. All rights reserved.</p>10aAdditive10aBacteria rejection10aPoly(acrylonitrile)10aPore size distribution10aUltrafiltration1 aLohokare, Harshada, R.1 aBhole, Yogesh, S.1 aTaralkar, Suyog1 aKharul, Ulhas, K.  uhttp://library.ncl.res.in/content/polyacrylonitrile-based-ultrafiltration-membranes-optimization-preparation-parameters-0