Rapid fabrication of TiO@carboxymethyl cellulose coatings capable of shielding UV, antifog and delaying support aging.

Agricultural plastic films capable of shielding UV, filtering visible light and antifog are important to prolong their life and protect safeties of agriculturists and crops. In this work, high stable and small size TiO@polymer nanoparticles (NPs) were prepared by an efficient one-pot microwave synthesis using titanic sulfate as Ti resource, carboxymethyl cellulose sodium (CMC) as complexing agent and stabilizer. The TiO@CMC NPs obtained were then utilized to fabricate poly(ethylene imine) (PEI)/TiO@CMC coatings on the surface of polypropylene films by a layer-by-layer assembly technique. The TiO@CMC NPs show rapid deposition rate because small, spherical and anion-rich TiO@CMC NPs possess large specific surface area and fast diffusion rate. More importantly, property experiments confirm that (PEI/TiO@CMC)*15 coatings can not only effectively shield UV rays, filter visible light and prevent fogging but also delay the aging of their supports.