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EnglishSurface evolution caused by thermal processing at 270 degreesC of blends of bisphenol-A polycarbonate (PC) with polyethyl eneterephthalate (PET) or with polybuthyleneterephthalate (PBT) has been investigated by ToF-SIMS. Such systems are known, upon melt mixing, to undergo transesterification reactions leading to the formation of copolymers. In the case of PET-PC, the transesterification is accompanied by reactions involving the loss of small molecules from the resulting copolymer, whereas the copolymer resulting from the transesterification of PBT-PC is stable at the temperature under consideration. We report on Static SIMS measurements performed on blend samples melt mixed for different times, that show a complex evolution of surface composition, explained also in terms of surface-specific processes, such as segregation of lower surface free energy components. The results from the melt mixed system are compared with those obtained from parallel temperature-programmed ToF-SIMS experiment, performed on spin-cast thin films. (C) 2003 Elsevier Science Ltd. All rights reserved.
| Titolo: | ToF-SIMS investigation of the thermally induced processes at the surface of polyester based polymer blends | |
| Autori interni: | ||
| Data di pubblicazione: | 2003 | |
| Rivista: | ||
| Handle: | http://hdl.handle.net/20.500.11769/10144 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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