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-102417nas a2200229   4500008004100000022001400041245013400055210006900189260006800258300001400326490000700340520153300347653002401880653001701904653003001921653002401951653003601975100001402011700002002025700001902045856012302064       2009                        eng d  a0887-624X00aControl of molecular aggregation in symmetrically substituted pi-conjugated bulky poly(p-phenylenevinylene)s and their copolymers0 aControl of molecular aggregation in symmetrically substituted pi  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcMAY  a2631-26460 v473 a<p>A new series of symmetrically substituted bulky PPV-copolymers based on poly(bis-2,5-(2-ethylhexyloxy)-1,4-phenylenevinylene) (BEH-PPV) bearing tricyclodecane (TCD) pendants were synthesized to study the effect of chain aggregation in the pi-conjugated polymer backbone. The composition of the copolymers was varied up to 100 mol % and the structures of the copolymer were confirmed by NMR and FTIR. The molecular weights of the copolymers were obtained as M(w) = 11,500-1,78,800 depending on the TCD-incorporation in BEH-PPV. The origin of the pi-aggregation was investigated using mixture of solvents (polar or nonpolar) or temperature as external stimuli. Absorption, photoluminescence, and time-resolved fluorescence decay techniques were employed as tools to trace molecular aggregation in solution and solid state. The TCD-substituted bulky copolymers showed almost twice the enhancement in photoluminescence compared with that of BEH-PPV Solvent-induced aggregation studies of copolymers revealed the existence of strong molecular aggregation in BEH-PPV compared with that of bulky copolymers. Variable temperature studies further evidence for the reversibility of molecular aggregation on beating/cooling cycles and showed isosbetic points with respect to free and aggregated polymer chains. Time-resolved fluorescent studies confirmed the existence of free and aggregated pi-conjugated species with a life time of 0.1 to 1.0 ns. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 2631-2646, 2009</p>10aconjugated polymers10afluorescence10apoly(p-phenylenevinylene)10asolution properties10aStructure-property relationship1 aResmi, R.1 aAmrutha, S., R.1 aJayakannan, M.  uhttps://library.ncl.res.in/content/control-molecular-aggregation-symmetrically-substituted-pi-conjugated-bulky-polyp-001748nas a2200301   4500008004100000022001400041245010100055210006900156260007700225300001200302490000800314520070400322653002101026653001301047653002601060653003401086653002401120100002301144700002201167700001901189700002101208700001601229700001701245700002201262700002001284700001801304856012401322       2011                        eng d  a1438-749200aSynthesis and drug-delivery behavior of chitosan-functionalized graphene oxide hybrid nanosheets0 aSynthesis and drugdelivery behavior of chitosanfunctionalized gr  aBOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANYbWILEY-V C H VERLAG GMBHcFEB  a131-1400 v2963 a<p>Chitosan-functionalized graphene oxides (FGOCs) were successfully synthesized. FGOCs were found to significantly improve the solubility of the GO in aqueous acidic media. The presence of organic groups was confirmed by means of XPS and TGA. Restoration of the sp(2) carbon network and exfoliation of graphene sheets were confirmed by Raman spectroscopy, UV-visible spectroscopy and WAXD. The SEM and AFM investigations of the resultant FGOCs showed that most of the graphene sheets were individual and few were layered. Controlled release behavior of Ibuprofen and 5-fluorouracil was then investigated. We found that FGOCs are a promising new material for biological and medical applications.</p>10aBiocompatibility10aChitosan10adrug delivery systems10afunctionalization of polymers10asolution properties1 aRana, Vijay, Kumar1 aChoi, Myeon-Cheon1 aKong, Jin-Yeon1 aKim, Gwang, Yeon1 aKim, Mi, Ju1 aKim, Sun-Hee1 aMishra, Satyendra1 aSingh, Raj, Pal1 aHa, Chang-Sik  uhttps://library.ncl.res.in/content/synthesis-and-drug-delivery-behavior-chitosan-functionalized-graphene-oxide-hybrid-0