Modification of the superficial properties of polyolefins and polyvinyl chloride: characterization, barrier properties of gases and ionic transport properties
01 Jan 2008 31 Dec 2009

The current investigation proposes the functionalization and characterisation of polyolefins (PE and PP) and polyvinyl chloride (PVC) by the introduction of groups based on phosphorus, sulphur and oxygen, as well as mercapto groups with different fluorine substitution degree in their structures. The incorporation of anionic groups in the surface of polymeric films will be optimized with the aim to improve adhesion and printing properties. The capability of these modified polyolefins to behave as polyelectrolytes in fuel cells will be also studied. For this reason, it is essential to obtain information about ionic conductivity changes as a function of relative humidity, by using broadband dielectric spectroscopy. The effect of these superficial modifications on the mechanical and barrier properties of the films (diffusion and sorption of gases) will be also investigated.