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Iomcs, Inc. Approach. - The membrane development program, which began in 1974 at Ionics, Inc., lS presently in its f1fth follow-on phase, begun 1n December 1980 (contract DEN3-204). H1ghlighted in th1S report will be the 1980 work (contract DEN3-137). Dur1ng th1S report1ng per10d (July 1~79 to Nov. 1980; DEN3-137) progress was made in opt1mizing the CD1L chem1stry formulation, a copolymer of vlnylbenzyl chlor1de (VBC) and dimethylamlnoethyl methacrylate, (DMAEMA), for area resistivity and select1vity and 1n improving fabr1cation techniques in order to improve yield and progress to larger membranes. Mem- brane samples were fabr1cated by incorporating varlat10ns 1n the membrane parameters (crosslink type and dens1ty, catalyst level, nonpolymerizable fractlon, functlonal group add1tion, and reduction of total membrane thick- ness). Prom1sing samples were then sent to Lewls for In-house analysis. Status. - Table 9 is an example of typical characterization data gathered on each membrane sample. In addit10n to acqu1ring characterization data, iron fouling and permeab1lity tests are also performed. Table 10 is an example of th1S type of data. Table 11 1S a summary table of the 1nfor- mat10n gathered from exper1ments involving variation of catalyst content. Membranes w1th a low catalyst content of 0.0625 percent have lower cell resist1vities and good selectivities. The present "standard membrane" 1ncorporates thlS var1atlon. Other characterlstics of the standard membrane 2 are an NP content of 27.5 percent and a select1v1ty of 20 ~gFe/h/cm /moles/ llter. Res1stance stability 1S much greater than 1n the past standard mem- brane, Wh1Ch had a catalyst content of 0.5 percent. A complete reVlew of the recent contractual efforts on these membrane variations can be found in the contractor's latest report (ref. 1). Additional 1nformat1on on past efforts in th1S area by the same contractor can be found ln prev10us reports (refs. 2 to 4). Lewis Research Center - Membrane evaluation Approach. - The In-house work done 1n the membrane area deals pr1mar1ly with evaluatlon of membranes that are produced as a result of the Ionics, Inc., contracts. Selected membranes that have undergone tests at Ionics are sent for evaluatlon and screenlng tests at Lew1s. These tests cons1st of (1) Dye testlng for plnholes: Pinholes allow Solut1on crossmixlng and therefore a reductlon in storage capacity. (2) Statlc dlffusion for selectlvity: Small membrane samples are placed between two half-cells contalning chambers fllled with var10US solutions and exposed to var10US temperature conditlons. Perlodlcally, a sample of Solutlon 1S wlthdrawn and analyzed. Select1v1ty 1S then determ1ned. (3) Area reslstivlty: Reslst1v1ty is determlned 1n various solutions at var10US temperatures. These measurements are made under statlc {nonflow} condit1ons. (4) Resistivity flow tests: Resistivity is determined in var10US Solut1ons under flow cond1t1ons. 14PDF Image | NASA Redox Storage System Development Project 1980
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