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- W2051216719 abstract "Attenuated total internal reflectance Fourier transform infrared, ATR-FTIR, spectroscopy was used to compare the water uptake and doping within polyelectrolyte multilayers made from poly(styrene sulfonate), PSS, and a polycation, either poly(allylamine hydrochloride), PAH, or poly(diallyldimethylammonium chloride), PDADMAC. Unlike PDADMA/PSS multilayers, whose water content depended on the solution ionic strength, PAH/PSS multilayers were resistant to doping by NaCl to a concentration of 1.2 M. Using (infrared active) perchlorate salt, the fraction of residual counterions in PDADMA/PSS and PAH/PSS was determined to be 3% and 6%, respectively. The free energy of association between the polymer segments, in the presence of NaClO4, was about 5 kJ mol-1 and −10 kJ mol-1, respectively, for PDADMA/PSS and PAH/PSS, indicating the relatively strong association between the polymer segments in the latter relative to the former. Varying the pH of the solution in contact with the PAH/PSS multilayer revealed a transition to a highly swollen state, interpreted to signal protonation of PAH under much more basic conditions than the pKa of the solution polymer. The increase in the multilayer pKa suggested an interaction energy for PAH/PSS in NaCl of ca. 16 kJ mol-1." @default.
- W2051216719 created "2016-06-24" @default.
- W2051216719 creator A5014157707 @default.
- W2051216719 creator A5050000139 @default.
- W2051216719 date "2006-12-13" @default.
- W2051216719 modified "2023-10-15" @default.
- W2051216719 title "Counterions and Water in Polyelectrolyte Multilayers: A Tale of Two Polycations" @default.
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- W2051216719 doi "https://doi.org/10.1021/la061839g" @default.
- W2051216719 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17209649" @default.
- W2051216719 hasPublicationYear "2006" @default.
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