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    Spin-spray-assisted layer-by-layer assembly of thick polymer films with self-healing, UV-protection, and anti-fog properties

    Journal: J. Polym. Sci.

    Authors: Kashem, Md Nayeem Hasan; Liu, Xu; Ding, Zhenya; Li, Wei

    Organizations: Global Laboratory for Energy Asset Management and Manufacturing (GLEAMM) at TTU

    Keywords: anti-fog; humidity; layer-by-layer; responsive polymer film; self-healing

    Layer-by-layer (LbL) deposition of oppositely charged polyelectrolytes has been widely used to make responsive and multifunctional smart films. Herein, a high-performance and multifunctional LbL film was fabricated by using a spin-spray-assisted (SSA-LbL) assembly method with poly(diallyldimethylammonium chloride) (PDDA) and poly(acrylic acid) (PAA). The SSA-LbL method was found to be more efficient and time-saver in making a homogeneous thick film in tens of micrometers, compared to the conventional immersive assembly method which makes thin films in the nanometer range. When scratches occur, the film shows a quick and durable self-healing capability due to the dynamic movement of the flexible polyelectrolyte complex chains at the edges of the scratches. An effective UV-block performance was incorporated into the film by using the graphene oxide (GO) and titanium dioxide (TiO2) nanoparticles as UV-blocking additives. Due to the hydrophilic feature of PDDA/PAA molecules, the film also showed the anti-fog property in different environmental conditions. The effect of the concentration of GO and TiO2 nanoparticles on self-healing and UV-protection properties were investigated. Also, the optimum range of concentration of GO and TiO2 nanoparticles in polyelectrolyte solutions was determined to fabricate the film with the combined features of self-healable, UV-blocking, and anti-fog.
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