02084nas a2200241   4500008004100000022001400041245008800055210006900143260006800212300001400280490000700294520122900301653003201530653001401562653001001576653002401586653002401610100001901634700001901653700002501672700002401697856012101721       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.  uhttps://library.ncl.res.in/content/polyacrylonitrile-ultrafiltration-membranes-i-polymer-salt-solvent-interactions-1