Sum-frequency vibrational spectroscopy of oxygen-ion and oxygen-radical treated poly(ethylene terephthalate) and oxide/poly(ethylene terephthalate) interface

摘要

The surface modified poly(ethylene terephthalate) (PET) film by its exposure to O-ion beam or O-radical beam, and the buried interface between an oxide layer and PET have been investigated by using sum-frequency generation. The O-ion beam exposure induces the cleavage of main chains and converts the ester moiety to -COOH terminal species. In contrast, O-radical beam does not induce degradation of main chains but it reacts to the polymer chain to form a new carbonyl species. After deposition of the TiO2 layer by using O-radical beam assisted method, C = O and phenyl ring of PET are tilted from the surface plane, In contrast to the case of TiO2/PET, deposition of SiO2 film does not induce changes in the molecular conformation of PET. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 16]