Effect of dipping solution pH values on electrostatic layer-by-layer self-assembly of side-chain azo polyelectrolyte |
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Authors: | Xuejia Yan Yonghong Deng Xiaogong Wang |
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Affiliation: | (1) Department of Chemical Engineering, Laboratory for Advanced Materials, Tsinghua University, Beijing, 100084, China |
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Abstract: | The effect of pH value on the electrostatic layer-by-layer self-assembly and the photo-responsive behavior of Poly{2-4-(4-ethoxyphenylazo)phenoxy]ethyl
acrylate-co-acrylic acid} (PEAPE) was studied. Results show that in the studied pH value range, the lower the pH value is, the higher
is the UV-vis absorbance and the larger is the thickness of the multilayer films. FTIR studies indicate that the azo polyelectrolyte
exhibits a different ionization degree in solutions with different pH values. The higher absorbance and the larger thickness
of the layer-by-layer films can be attributed to the low ionization degree and the shrinkage conformation of PEAPE in the
solution with low pH values. FTIR analysis also confirms that the driving force for layer-by-layer self-assembly of PEAPE
and PDAC is the electrostatic interaction.
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Translated from Acta Polymerica Sinica, 2007, 5: 440–445 译自: 高 分子学报] |
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Keywords: | layer-by-layer self-assembly azo polyelectrolyte pH value |
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