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- W2051531627 abstract "AbstractCarboxymethylcellulose(CMC)hydrogelformedbyionizingradiationathighlyconcentratedaqueoussolutionswasfoundtoundergoswellingdependingonthepHoftheswellingmedia.SwellingincreasesatneutralandbasicpHduetoionizationofcarboxymethylgroupsonsidechains.Thepresenceofchargesdevelopsrepulsiveforcesbetweenpolymerchainsofthenetworkcausingitsexpansion.Hydrogelinrelaxedstateaswellasdriedgelrevealsgoodmechanicalproperties.Itwasconsideredthatintermolecularcrosslinkingreactionsoccurbyaradicalroute.RadicalsplacedonanhydroglucoserepeatingunitaswellasonsidechainsweredistinguishedfromESRspectraofCMC.Astabledoubletsignal with 2.0mT splitting constant belongs to a radical placed on the a-carbon atom of the substituent group,R–O– d CH–COO – .Itwasassumedthatthisspeciesparticipatesinintermolecularcrosslinking.r 2003ElsevierLtd.Allrightsreserved. Keywords: Carboxymethylcellulose;Hydrogels;Crosslinking;Ionizingradiation;Radicals 1. IntroductionBasicrequirementsforpolymericabsorbentsarelargefluid uptake and high mechanical strength. These twodemandsareclearlyconflicting,andasuitablecompro-mise needs to be found. A high degree of swelling inaqueous systems can be achieved by using polyelec-trolytesbecauseofmobilecounterions presentinsuchgels develop a large swelling pressure (Florry, 1953).Thus,carboxymethylcellulose(CMC),whichisthemostpopularandthecheapestcelluloseethercanbeusedforthis purpose. It is an anionic linear polymer in whichoriginal H atoms of cellulose hydroxyl groups arereplaced by carboxymethyl substituent, –CH" @default.
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- W2051531627 date "2003-12-01" @default.
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- W2051531627 title "Radiation crosslinking of carboxymethylcellulose of various degree of substitution at high concentration in aqueous solutions of natural pH" @default.
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- W2051531627 doi "https://doi.org/10.1016/s0969-806x(03)00403-1" @default.
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