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• W2034694484 abstract "The retention performance of the poly(ethylene oxide) (PEO) and tannic acid (TA) dual system was studied in the presence of poly(diallyldimethyl ammonium chloride) (PDADMAC). The zeta potential, and size of the association complex between PEO and TA in the presence of PDADMAC as well as the infrared spectra of TA and the PEO-TA system were also studied. It was shown that hydrogen bonds are formed between the phenolic and acidic groups of TA and the oxygen atoms of the PEO macromolecules. Moreover, it was found that the presence of small quantities of PDADMAC enhances the fibre fines and clay first pass retention. The maximum effect was observed with an amount of added PDADMAC equal to 20% of the amount of added PEO. Further addition of PDADMAC was found to decrease the retention probably because it re-charges the surface to positive. When clay was replaced by ground calcium carbonate no retention improvement was detected. This is most likely due to the presence of calcium ions. La performance de rétention du système double oxyde de polyéthylène (PEO) et acide tannique (TA) a été étudiée en présence de chlorure d'ammonium de polydialyldiméthyle (PDADMAC). Le potentiel zèta et la taille du complexe d'association entre PEO et TA en présence de PDADMAC, ainsi que les spectres infrarouges de TA et dy système PEO-TA ont également été étudiés. On a montré que les liaisons hydrogènes se forment entre les groupes phénoliques et acides de TA et les atomes d'oxygène des macromolécules de PEO. En outre, on a trouvé que la présence de petites quantités de PDADMAC accroœt les fines de fibres et la rétention d'argile au premier passage. L'effet maximum est observé avec une quantité ajoutée de PDADMAC égale à 20% de la quantité de PEO ajoutée. On a trouvé que de plus grandes quantités ajoutées de PDADMAC diminuaient la rétention probablement du fait que cela recharge la surface positivement. Lorsque l'argile est remplacée par du carbonate de calcium moulu aucune amélioration de la rétention n'est observée. Cela est très certainement d- à la présence des ions de calcium." @default.
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• W2034694484 date "1998-04-01" @default.
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• W2034694484 title "Enhancement of the retention performance of the poly(ethylene oxide) - tannic acid system by poly (diallyldimethyl ammonium chloride)" @default.
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• W2034694484 doi "https://doi.org/10.1002/cjce.5450760214" @default.
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