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Titolo:
COMPETITIVE ADSORPTION OF CATIONIC POLYACRYLAMIDES WITH DIFFERENT MOLECULAR-WEIGHTS ONTO POLYSTYRENE LATEX, CELLULOSE BEADS AND CELLULOSE FIBERS
Autore:
TANAKA H; SWERIN A; ODBERG L; PARK SB;
Indirizzi:
KYUSHU UNIV,DEPT FOREST PROD,HIGASHI KU FUKUOKA 81281 JAPAN STFI S-11486 STOCKHOLM SWEDEN
Titolo Testata:
Journal of pulp and paper science
fascicolo: 8, volume: 23, anno: 1997,
pagine: 359 - 365
SICI:
0826-6220(1997)23:8<359:CAOCPW>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIBERS; POLYMERS; EXCHANGE;
Keywords:
ACRYLAMIDE; ACRYLIC COMPOUNDS; ADDITION POLYMERS; ADSORPTION; CATIONIC COMPOUNDS; CELLULOSE FIBERS; CHEMICAL PROPERTIES; LATEX; MOLECULAR WEIGHT; NATURAL FIBERS; POLYACRYLICS; POLYSTYRENE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
H. Tanaka et al., "COMPETITIVE ADSORPTION OF CATIONIC POLYACRYLAMIDES WITH DIFFERENT MOLECULAR-WEIGHTS ONTO POLYSTYRENE LATEX, CELLULOSE BEADS AND CELLULOSE FIBERS", Journal of pulp and paper science, 23(8), 1997, pp. 359-365

Abstract

The individual and competitive adsorption of two cationic polyacrylamides (C-PAM), with different molecular weights (MW), 1.7.10(6) and 1.1.10(4) but with very similar charge densities, 0.70 and 0.71 meq/g respectively, have been studied. The substrates were monodisperse polystyrene latex (PSL), cellulose beads and cellulose fibres. A 1:1 mixture by weight of fluorescently labelled C-PAM with low MW and unlabelled C-PAM with high MW were used for the competitive adsorption experiment At the stirring speeds used the adsorption of these C-PAMs onto PSL was very rapid regardless of MW and the adsorbed amount of C-PAM with low MW was somewhat greater than that with higher MW. This small difference is probably due to the existence of small irregularities on the surface of PSL and the mol-e rapid diffusion of the low MW polymer. Onlya small difference is observed since the adsorption is primarily governed by the collision frequencies. The adsorption on PSL is virtually constant with time. At short tines, the adsorption behaviour of C-PAMsonto cellulose beads and fibres is essentially the same as that onto PSL. However the adsorbed amounts of C-PAM gradually increases both for cellulose beads and cellulose fibres, most rapidly for low MW C-PAM on fibres and most slowly for high MW C-PAM on cellulose beads. These results can be mainly attributed to the porous nature of the cellulosebends and fibres. The effect of stirring speed on the diffusion of polymer into the interior of cellulose materials was minor because the stirring has no effect inside the pores.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 16:48:09