02067nas a2200241   4500008004100000022001400041245010200055210006900157260006800226300001400294490000800308520117400316653003201490653001301522653001401535653002701549653002401576100002401600700002101624700002401645700002501669856013101694       2007                        eng d  a0021-899500aSwelling and mechanical behavior of modified poly(vinyl alcohol)/laponite nanocomposite membranes0 aSwelling and mechanical behavior of modified polyvinyl alcoholla  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcMAR  a2896-29030 v1033 a<p>Nanocomposite (NC) membranes based on hydrophobically modified PVA and laponite were synthesized with varying laponite content in the feed. The incorporation of laponite in NC membranes was investigated by FTIR spectroscopy and thermogravimetric analysis. The swelling ratio of membranes was determined as a function of temperature and laponite content. Swelling studies of NC membranes exhibited the decrease in swelling with an increase in laponite content in the NC membranes. The swelling ratio of NC membrane with 20% laponite slightly increased with an increase in temperature. Dynamic mechanical analysis showed the systematic increase in storage modulus with laponite content, which indicates the enhancement of mechanical property upon laponite addition. There was also a decrease in the tan 6 peak values of NC membranes with an increase in laponite content in NCs. The permeabilities through NC membranes as a function of solute size and laponite content were studied and the results showed molecular screening based on size. The permeability of solute reduced due to the presence of well-dispersed laponite in the NC. (c) 2006 Wiley Periodicals, Inc.</p>10aDynamic mechanical analysis10alaponite10amembranes10ananocomposite hydrogel10apoly(vinyl alcohol)1 aNair, Shubhangi, H.1 aPawar, Kiran, C.1 aJog, Jyoti, Prakash1 aBadiger, Manohar, V.  uhttps://library.ncl.res.in/content/swelling-and-mechanical-behavior-modified-polyvinyl-alcohollaponite-nanocomposite-membranes02205nas a2200253   4500008004100000022001400041245009700055210006900152260000800221490000800229520133700237653002901574653003401603653000901637653001401646653002101660100002801681700002701709700001701736700002201753700002401775700002501799856012701824       2026                        eng d  a0021-899500aHigh-performance sultone-modified PVA/PAMPS semi-IPN hydrogels for proton exchange membranes0 aHighperformance sultonemodified PVAPAMPS semiIPN hydrogels for p  cAPR0 v1433 a<p>Hydrogel membranes composed of poly(2-acrylamido-2-methyl-1-propanesulfonic acid) (PAMPS) and sultone-modified poly(vinyl alcohol) (PVA) were successfully synthesized and evaluated as promising proton-conducting materials. A key advantage involves the premodification of PVA with 1,3-propane sultone to introduce sulfonic acid groups, thereby imparting proton conductivity to the PVA backbone. This sultone-modified PVA was then physically entangled within a PAMPS cross-linked network to form novel semi-interpenetrating network (semi-IPN) hydrogels. This synergistic design leverages the excellent film-forming and mechanical properties of PVA with the high proton conductivity inherent to PAMPS. The synthesized membranes exhibited robust mechanical properties, with tensile strengths ranging from 5 to 30 MPa and percentage elongations between 200% and 400%, depending on their humidity content. These hydrogel membranes demonstrated proton conductivities ranging from 0.6 to 4.3 x 10-2 S cm-1. The activation energy for proton conduction was found to be as low as 3.5 kJ mol-1, significantly lower than that of the commercial benchmark membrane, Nafion 117 (12 kJ mol-1). These findings underscore the potential of these novel PAMPS/sultone-modified PVA semi-IPN hydrogel membranes for advanced fuel cell applications.</p>
10abatteries and fuel cells10afunctionalization of polymers10aGels10amembranes10apolyelectrolytes1 aPatwadkar, Manjusha, V.1 aIllathvalappil, Rajith1 aTorris, Arun1 aFrancis, Sifa, C.1 aKurungot, Sreekumar1 aBadiger, Manohar, V.  uhttps://library.ncl.res.in/content/high-performance-sultone-modified-pvapamps-semi-ipn-hydrogels-proton-exchange-membranes