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- W2417804518 abstract "The hydrogen-bonded films were prepared via layer-by-layer assembly of poly (vinylpyrrolidone) (PVPON, hydrogen bond acceptors) and poly (acrylic acid) (PAA, hydrogen bond donors). UV-Visible spectra, FTIR spectra and AFM were used to investigate the hydrogen bond detachment and the film disintegration in acidic solvents :formic acid, trifluoroacetic acid, phosphoric acid and poly (phosphoric acid). The dissolution rate of the PVPON/PAA thin film in different acids was queued as trifluoroacetic acid > phosphoric acid > formic acid. The experimental results indicated that the mechanism of hydrogen bond detachment was not the same in different acids. Trifluoroacetic acid shows strong interaction with PAA, which induces the detachment of hydrogen bonds between PVPON and PAA, and thus the PVPON/PAA film dissolves. However, phosphoric acid or poly(phosphoric acid) has strong interaction with PVPON, which makes hydrogen bonds between PVPON and PAA break and the thin film decomposes. Poly (phosphoric acid) has more hydrogen bonding donor groups than phosphoric acid, and hence the interaction between poly(phosphoric acid) and PVPON exhibits an synergetic effect. Formic acid and PAA both belong to the family of carboxylic acids. It is very hard for formic acid to replace PAA to form hydrogen bond with PVPON, and hence the film dissolution rate in formic acid is very low." @default.
- W2417804518 created "2016-06-24" @default.
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- W2417804518 date "2015-07-20" @default.
- W2417804518 modified "2023-09-24" @default.
- W2417804518 title "Disassociation of Hydrogen-bonded Polymer Complex Thin Films in Acidic Solvents" @default.
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