Tuning the properties of layer-by-layer assembled poly(acrylic acid) click films and capsules

Abstract

The combination of click chemistry and layer-by-layer (LbL) assembly provides a useful and convenient means of preparing functional, covalently stabilized films and capsules. Herein, we examine various parameters that affect the buildup of click-LbL assembled multilayers of azide- and alkyne-modified poly(acrylic acid) (PAAAz and PAAAlk, respectively). We demonstrate that film thickness and morphology can be tailored by varying the assembly conditions. The thicknesses of multilayers assembled from PAA Az and PAAAlk [(PAAAz/PAAAlk) 5] on planar substrates varied from ∼70 nm when assembled at pH 2.5 to 10 nm when prepared at pH 4. Increasing the ionic strength of the adsorption solution result..