01858nas a2200241 4500008004100000022001400041245006700055210006700122260007300189300001400262490000700276520105200283653003201335653001601367653002701383653001301410653001601423100001901439700001601458700002401474700001901498856009901517 2006 eng d a1381-514800aNovel beaded polymers from telechelic methacrylic ether esters0 aNovel beaded polymers from telechelic methacrylic ether esters aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT a1087-10960 v663 a

A series of telechelic dimethacrylic ether-esters (MEE) were prepared by solventless reaction of alpha,omega-dihydroxy poly(oxytetramethylene) (polytetrahydrofuran, PTHF) with phthalic anhydride and glycidyl methacrylate (GMA). MEE was polymerized with GMA as well as GMA-ethylene dimethacrylate (EGDM) to form porous beads. The terpolymer beads were observed using optical microscopy and SEM and characterized for internal pore volume, equilibrium volume-swelling ratio and dimethyl formamide and aqueous buffer regain. The morphology of the beads was dictated by the mole fraction and molecular weight of MEE in the feed. Porosity was found to increase with increase in molecular weight of MEE. Thus, porosity as high as 49%, 50% and 55% was observed with MEE of molecular weights 1580, 2580 and 3480, respectively. At a specific terpolymerization feed ratio of monomers, the terpolymers formed transform from gel like structure into a macroporous one, with increase in molecular weight of MEE. (c) 2006 Elsevier B.V. All rights reserved.

10aether-ester dimethacrylates10amacroporous10aPore size distribution10aporosity10atelechelics1 aPujari, N., S.1 aTrivedi, J.1 aIngavle, Ganesh, C.1 aPonrathnam, S. uhttps://library.ncl.res.in/content/novel-beaded-polymers-telechelic-methacrylic-ether-esters-002308nas a2200241 4500008004100000022001400041245009600055210006900151260007300220300001000293490000800303520143000311653001301741653002301754653002401777653002701801653002001828100002701848700002201875700002001897700002201917856012701939 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

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.

10aAdditive10aBacteria rejection10aPoly(acrylonitrile)10aPore size distribution10aUltrafiltration1 aLohokare, Harshada, R.1 aBhole, Yogesh, S.1 aTaralkar, Suyog1 aKharul, Ulhas, K. uhttps://library.ncl.res.in/content/polyacrylonitrile-based-ultrafiltration-membranes-optimization-preparation-parameters-001836nas a2200217 4500008004100000022001400041245011200055210006900167260000900236300001200245490000800257520105800265653001901323653002701342653002901369653002001398100002701418700002701445700002301472856012301495 2018 eng d a0376-738800aSolvent and pH-stable poly(2,5-benzimidazole) (ABPBI) based UF membranes: preparation and characterizations0 aSolvent and pHstable poly25benzimidazole ABPBI based UF membrane cOCT  a743-7510 v5633 a

Poly(2,5-benzimidazole), commonly known as ABPBI, is an excellent thermo-chemically stable polymer that is widely evaluated as a proton exchange membrane material in a fuel cell. Its niche intrinsic characteristics could be highly useful in the membrane preparation for various separation applications, especially under harsher environments. To gain insights towards this feasibility, ABPBI based supported membranes were prepared by phase inversion method. Effects of the nonwoven porous support material (polypropylene/polyester), non-solvent (water/0.5 N NaOH) and polymer concentration (6 or 4 wt%) on the membrane properties (water flux, rejection and porosity) were investigated. The stability of these membranes towards common organic solvents, concentrated acid (25 N H2SO4), base (2.5 N NaOH) and an autoclave condition was analyzed. ABPBI membrane showed a pore collapse after drying. In order to avoid this, the glycerol treatment was not only found to be suitable but also repeatable, without significant deviations in the water flux.

10aABPBI membrane10aPore size distribution10aSolvent stable membranes10aUltrafiltration1 aLohokare, Harshada, R.1 aChaudhari, Harshal, D.1 aKharul, Ulhas., K. uhttps://library.ncl.res.in/content/solvent-and-ph-stable-poly25-benzimidazole-abpbi-based-uf-membranes-preparation-and02260nas a2200277 4500008004100000022001400041245011800055210006900173260000800242300001100250490000700261520129000268653001101558653003501569653003001604653006201634653002701696653001301723100001601736700002101752700002301773700001701796700002101813700001601834856013201850 2026 eng d a1615-684600aStructure-performance relationships of commercial cathode gas diffusion layers in high-temperature PEM fuel cells0 aStructureperformance relationships of commercial cathode gas dif cJUL ae701370 v263 a

The influence of cathode gas diffusion layer (GDL) architecture on the performance of high-temperature proton exchange membrane fuel cells (HT-PEMFCs) remains insufficiently understood, particularly for commercially available materials with different substrate and microporous layer (MPL) designs. In this study, six commercial cathode GDLs were systematically compared using polarization analysis, electrochemical impedance spectroscopy, contact-angle measurement, scanning electron microscopy, mercury intrusion porosimetry, x-ray computed tomography, and COMSOL simulation. SGL 36BB and 22BB showed the best performance under both H2/Air and H2/O2, reaching maximum power densities of 0.445 +/- 0.005 and 0.426 +/- 0.011 W/cm2, whereas H23C2 performed worst at 0.302 +/- 0.008 W/cm2. The electrochemical and structural results indicate that backing-layer hydrophobic treatment and MPL architecture play a critical role in phosphoric acid management and transport losses, whereas porosity alone does not fully explain the observed performance ranking. The simulation reproduced the overall experimental trend for most GDLs, while the deviation observed for H23C2 suggests that acid-related effects should be more explicitly considered in future modeling of HT-PEMFC GDLs.

10aCOMSOL10aequivalent circuit model (ECM)10agas diffusion layer (GDL)10ahigh-temperature polymer electrolyte fuel cell (HT-PEMFC)10aPore size distribution10aporosity1 aWon, Ahyeon1 aAgarwal, Harshal1 aRanganath, Suresha1 aTorris, Arun1 aCremers, Carsten1 aTubke, Jens uhttps://library.ncl.res.in/content/structure-performance-relationships-commercial-cathode-gas-diffusion-layers-high-temperature