Photopolymerizable hybrid sol gel coating as a barrier against plasticizer release

In this work, a dip-coating method was applied to coat polyvinyl chloride (PVC) used in the field of medicine with an organic/inorganic sol gel hybrid layer based on two organic functionalized titanium alkoxide and organic grafted alkoxysilane. The aim of the coating is to prevent the plasticizers release from PVC and to protect PVC against UV degradation. The optical and structural properties of the coating were investigated using UV–visible and infrared spectroscopy. ATR-FTIR spectroscopy was performed to control the amount of plasticizer leaching from the PVC medical device. The mechanical properties of the PVC and coated PVC samples were determined using tensile test. The barrier effect of the hybrid sol gel on the migration of the plasticizers was assessed using high performance liquid chromatography. Surprisingly the coating protects the PVC substrate against the UVA degradation and prevents leaching of plasticizers up to 98%. The adhesion of the hybrid coating on PVC exhibits a constant value whatever the treatments (UV-ozone and plasma) performed on the polymer surface.

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► Efficient hybrid sol gel coating against the plasticizer's release from PVC.
► Plasticizer's leaching reduces up to 98%.
► High transparency coating which acts as an UV filter to reduce the degradation of the polymer.
► High mechanical properties of the coated material given by the hybrid film.