Crystallisation kinetics of poly(ethylene therephtalate) (PET) at 107°C was studied in thin and ultrathin films prepared on aluminium and silica substrates. Infrared spectroscopy in transmission or IRRAS mode was exploited to follow the crystallisation kinetics in samples on the transparent amorphous silica windows and on the reflecting aluminium, respectively. On the mostly apolar amorphous silica substrate the crystallisation rate was found to increase when the film thickness was 35 nm, while, the crystallisation was found to be appreciably slowed down with respect to the bulk on the mostly polar aluminium substrate. Infrared results were also confirmed by atomic force microscopy analysis. Kinetics results were discussed with respect to the different conformation of the polymer chain in the ultrathin films with respect to the bulk resulting by the analysis of the peak position and intensity in the infrared spectra.
Study of the cold crystallisation of poly(ethylene therephtalate) in ultrathin films by infrared spectroscopy and atomic force microscopy
Bertoldo M;
2009
Abstract
Crystallisation kinetics of poly(ethylene therephtalate) (PET) at 107°C was studied in thin and ultrathin films prepared on aluminium and silica substrates. Infrared spectroscopy in transmission or IRRAS mode was exploited to follow the crystallisation kinetics in samples on the transparent amorphous silica windows and on the reflecting aluminium, respectively. On the mostly apolar amorphous silica substrate the crystallisation rate was found to increase when the film thickness was 35 nm, while, the crystallisation was found to be appreciably slowed down with respect to the bulk on the mostly polar aluminium substrate. Infrared results were also confirmed by atomic force microscopy analysis. Kinetics results were discussed with respect to the different conformation of the polymer chain in the ultrathin films with respect to the bulk resulting by the analysis of the peak position and intensity in the infrared spectra.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
