02205nas 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-membranes02091nas a2200265   4500008004100000022001400041245012200055210006900177260000800246490000800254520116300262653001501425653002101440653003701461653002401498100002701522700001901549700001701568700001901585700002601604700002401630700002501654700002301679856012301702       2026                        eng d  a0021-899500aInsight Into the Influence of Salinity on Flow and Flocculation Behavior of Acrylamide-Based Cationic Polyelectrolyte0 aInsight Into the Influence of Salinity on Flow and Flocculation   cMAR0 v1433 a<p>
	The viscometric behavior of aqueous solutions of acrylamide and acrylamidopropyl trimethylammonium chloride copolymers (AM-co-APTMAC) with varying cationic content under different salinity conditions was studied. Viscometric measurements were employed to determine intrinsic viscosity and quantify the influence of electrostatic interactions on chain conformation. Rheology experiments were performed to probe dynamic flow behavior under shear to obtain insights into polyelectrolyte viscoelastic properties under conditions mimicking industrial processes. Viscometric and rheology data analysis is augmented with insights from NMR relaxation and pulsed field gradient NMR diffusion experiments. Further, flocculation of kaolin suspensions was studied using aqueous solutions of AM-co-APTMAC copolymers with different charge fractions in the presence and absence of salt. The physicochemical insights on the behavior of AM-co-APTMAC polyelectrolytes in solution from this study could be relevant in practical applications, such as plants that use seawater or in cases where the ionic strength of suspensions is high due to salinity in the medium.</p>
10acopolymers10apolyelectrolytes10astructure property relationships10atheory and modeling1 aRanganath, Suresha, P.1 aKurian, Rachna1 aTorris, Arun1 aKhairnar, Ajay1 aRavindranathan, Sapna1 aRajamohanan, P., R.1 aBadiger, Manohar, V.1 aWolf, Bernhard, A.  uhttps://library.ncl.res.in/content/insight-influence-salinity-flow-and-flocculation-behavior-acrylamide-based-cationic