Thin amorphous layers of poly(ethylene terephthalate-ethylene isophthalate) (PETI) containing variable concentration of an antioxidant additive (Irgafos 168) were deposited by spin casting from solution onto silicon wafers. ToF-secondary ion mass spectrometry (SIMS) results showed that a very low bulk percentages (similar to1 wt.%) of additive led to an almost uniform covering of the polymer surface, indicating a strong surface segregation (blooming effect). Multivariate statistical methods (PCA) allowed us to quantify the additive surface concentration in the lower concentration range (less than or equal to0.3 wt.%). ToF-SIMS imaging confirmed the uniform surface covering and, for higher concentration (5.5 additive wt.%), showed the formation of additive crystals on the top of the additive covered PETI surface. (C) 2002 Elsevier Science B.V. All rights reserved.
Antioxidant segregation and crystallisation at polyester surfaces studied by ToF-SIMS
LICCIARDELLO, Antonino;Auditore A;
2003-01-01
Abstract
Thin amorphous layers of poly(ethylene terephthalate-ethylene isophthalate) (PETI) containing variable concentration of an antioxidant additive (Irgafos 168) were deposited by spin casting from solution onto silicon wafers. ToF-secondary ion mass spectrometry (SIMS) results showed that a very low bulk percentages (similar to1 wt.%) of additive led to an almost uniform covering of the polymer surface, indicating a strong surface segregation (blooming effect). Multivariate statistical methods (PCA) allowed us to quantify the additive surface concentration in the lower concentration range (less than or equal to0.3 wt.%). ToF-SIMS imaging confirmed the uniform surface covering and, for higher concentration (5.5 additive wt.%), showed the formation of additive crystals on the top of the additive covered PETI surface. (C) 2002 Elsevier Science B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
