In order to further expand the applications of polyimide, titanium oxide (TiO2) was deposited on flexible Kapton substrate by successive ionic layer adsorption and reaction (SILAR) method at room temperature. The growth process was systematically investigated by analyzing the changes of surface structures, film thickness, water wettability and adhesion work during film deposition. The results showed the SILAR TiO2 films growth initializes in an island-like pattern and then gradually transforms into a 2D layered manner after 10 deposition cycles with a growth rate of about 0.5 nm/cycle. With the increase of cycle number, the water wettability and adhesion work increased to ensure the deposition process to be continued. Interestingly, the obtained TiO2 film exhibits weak crystallinity, which is attributed to the surface graphitized structure of Kapton induced by the ultraviolet (UV) activation in ambient. However, no information of the crystalline phase was detected when TiO2 films were deposited on glass or polyethylene (PE) substrates without the special graphit-like structures under the same conditions. Hence, the growth mechanisms as the surface reactions, film formation and continuous growth behaviors of TiO2 film on Kapton substrate were discussed in details.

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In this work, we studied the influence of the geometry and degree of filling of glass dispersed particles on the optical and mechanical properties of flexible high-transmission composites, based on thermoplastic polyurethane. Glass spheres, glass flake and milling glass fiber were used as fillers. Studies of mechanical properties have shown that the introduction of any filler leads to a decrease in tensile strength and an increase in the elastic modulus of the composite material, however, with the introduction of glass flakes and milling glass fiber, a significant increase in the yield strength of the material is observed. The optical properties of composites with glass spheres decrease exponentially with an increase in the volume fraction of the filler. With an increase in the concentration of glass flakes and milling glass fiber to 10 vol.%, a sharp decrease in transmission is observed. With a further increase in concentration, the orientation of the filler along the film occurs, due to which the transmission in the visible range increases to values close to those of a pure polymer.

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