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Matches in SemOpenAlex for { <https://semopenalex.org/work/W2005998323> ?p ?o ?g. }

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• W2005998323 abstract "A hydrogel was prepared by mixing poly(allylbiguanido-co-allylamine) hydrochloride (PAB) with poly(vinyl alcohol) (PVA) and by repeatedly freezing and thawing the blend. The swelling behaviour of the gel was studied as a function of the pH and ionic strength of the medium. The performance of the gel was compared to that of a blend hydrogel made from poly(allylamine) hydrochloride (PAA) and PVA. In a salt-free aqueous medium, the PAB/PVA hydrogel displayed a remarkable pH response: a drastic reduction in size was observed above pH 9 and below pH 3, but the size was little affected in the pH range 3–9. In a medium of constant ionic strength (μ = 0.1), the hydrogel's pH response was much different: it was significantly reduced in size above pH 10, but the size was affected only moderately below pH 10. When the ionic strength of the medium was varied at a fixed pH, the size change of the hydrogel was gradual. For instance, in sodium chloride solutions (at a pH of 6.0), the hydrogel shrank by about 30% as the electrolyte concentration was raised from 10−6 to 2 mol l−1. All these phenomena could be understood by observing that: (i) PAB is subject to multiple acid-base equilibria (with widely spaced pKa values); and (ii) the electrostatic interactions among the charges on the polymer backbone are shielded by the added electrolyte as the ionic strength of the medium is raised." @default.
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• W2005998323 date "1995-01-01" @default.
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• W2005998323 title "Swelling characteristics of a blend hydrogel made of poly(allylbiguanido-co-allylamine) and poly(vinyl alcohol)" @default.
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• W2005998323 doi "https://doi.org/10.1016/0032-3861(95)91204-k" @default.
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