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• W2000643795 abstract "Different types of polyelectrolyte multilayer films composed of poly(L-lysine)/hyaluronan (PLL/HA), chitosan/hyaluronan (CHI/HA) and poly(allylamine hydrochloride)/poly(L-glutamic acid) (PAH/PGA) have been investigated for their internal composition, including water content, ion pairing, and ability to be covalently cross-linked, as well as for their mechanical properties. Film buildup under physiological conditions was monitored by the quartz crystal microbalance with dissipation monitoring (QCM-D) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR), which allows unambiguous quantification of the different groups present in the polyelectrolytes. (PAH/PGA) films emerged as the most dense films with the lowest hydration (29%) and the highest COO(-) molar density. In addition, PAH is greatly in excess in these films (3 PAH monomers per PGA monomer). The formation of amide bonds during film cross-linking using the water-soluble carbodiimide EDC was also investigated. All of the films could be cross-linked in a tunable manner, but PAH/PGA exhibited the highest absolute number of amide bonds created, approximately 7 times more than for (PLL/HA) and (CHI/HA) films. The Young's modulus E of the films measured by AFM nanoindentation was shown to vary over 1 to 2 orders of magnitude for the different systems. Interestingly, a linear relationship between E and the density of the covalent cross-links created was observed for (PLL/HA) and (CHI/HA) films whereas (PGA/PAH) films exhibited biphasic behavior. The mean distance between covalent cross-links was estimated to be approximately 11 nm for (PLL/HA) and (CHI/HA) films and only approximately 6 nm for (PAH/PGA) films for the maximum EDC concentration tested (100 mg/mL)." @default.
• W2000643795 created "2016-06-24" @default.
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• W2000643795 date "2009-09-03" @default.
• W2000643795 modified "2023-10-12" @default.
• W2000643795 title "Internal Composition versus the Mechanical Properties of Polyelectrolyte Multilayer Films: The Influence of Chemical Cross-Linking" @default.
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• W2000643795 doi "https://doi.org/10.1021/la9018663" @default.
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