Abstract
Monolayers of photochromic azobenzene (Az) containing amphiphilic polymers based on neutral [poly(vinyl alcohol) (PVA)] and cationic [polyallylamine (PAA)] materials were spread on a water surface, and mechanical response induced by photoirradiation was investigated. Observation of photomechanical effects in charged monolayers is reported for the first time. In comparison with the behavior of monolayers of the neutral PVA-based polymer, the monolayer of the cationic PAA derivative was found to show improved photomechanical response in terms of accelerated response and unchanging expanding ability even at higher surface pressures. UV-visible absorption spectroscopic measurements of the monolayers at the air-water interface revealed that the aggregation of the Az side chain of the PAA derivative is more suppressed than the PVA monolayer possibly due to the lateral charge repulsion. Morphological observation by Brewster angle microscopy indicated that the domain structures of the monolayers of PVA- and PAA-based polymers in the trans state are completely different. The neutral monolayer gave rigid and continuous domains without holes, whereas domains of the cationic monolayer exhibited highly amorphous characteristics with numbers of featureless holes. Such differences in the Az packing state can be correlated with variation of the photomechanical response in the two Az monolayers. Addition of a polyanion in the subphase was found to impede substantially the film expansion of the trans PAA-based monolayer due to the interfacial ionic crosslinking.
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Seki, T., Sekizawa, H., Fukuda, Ri. et al. Features of Photomechanical Response in Monolayers Composed of a Charged Amphiphilic Azobenzene Polymer. Polym J 28, 613–618 (1996). https://doi.org/10.1295/polymj.28.613
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DOI: https://doi.org/10.1295/polymj.28.613
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