A TSPM-modified silica has been prepared and employed as a filler in LDPE films, in which a photo-grafting reaction between polymerizable groups present on the functionalized filler and the polymer has been performed with the aim of obtaining stable composites with improved properties. Besides FT-IR, TGA and SEM characterization, both the TSPM-modified silica and the polymer-filler blends have been extensively investigated by means of solid state NMR, through a combined analysis of several high- and low-resolution experiments, performed on 29Si, 1H and 13C nuclei. This allowed us on one hand to obtain detailed and quantitative information on the silica functionalisation reaction and on the other hand, to get an insight into the change of the dynamic properties of LDPE due to the presence of the filler. The NMR results and several macroscopic properties of the blend LDPE–silica–TSPM, such as Young’s modulus and oxygen permeability, were compared with those of the corresponding unfunctionalized silica.
Improving compatibility in LDPE-silica dispersions by photo-grafting reaction. Preparation and solid state NMR investigation
BORSACCHI, SILVIA;GEPPI, MARCO;VERACINI, CARLO ALBERTO;RICCI, LUCIA;RUGGERI, GIACOMO
2006-01-01
Abstract
A TSPM-modified silica has been prepared and employed as a filler in LDPE films, in which a photo-grafting reaction between polymerizable groups present on the functionalized filler and the polymer has been performed with the aim of obtaining stable composites with improved properties. Besides FT-IR, TGA and SEM characterization, both the TSPM-modified silica and the polymer-filler blends have been extensively investigated by means of solid state NMR, through a combined analysis of several high- and low-resolution experiments, performed on 29Si, 1H and 13C nuclei. This allowed us on one hand to obtain detailed and quantitative information on the silica functionalisation reaction and on the other hand, to get an insight into the change of the dynamic properties of LDPE due to the presence of the filler. The NMR results and several macroscopic properties of the blend LDPE–silica–TSPM, such as Young’s modulus and oxygen permeability, were compared with those of the corresponding unfunctionalized silica.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
