Abstract
The influence of the chain sequence structure of an alternating ethylene–tetrafluoroethylene (ETFE) copolymer and poly(vinylidene fluoride) (PVDF) on both positive and negative time-of-flight secondary ion mass spectrometry (ToF-SIMS) spectra (m/z≤200) was studied. The C1, C2, C3, C4 and C5 positive ions were found in the ETFE spectrum, while only the C1, C2 and C3 positive ions were found in the PVDF spectrum. These results indicate that ETFE can be distinguished from PVDF by the presence of its characteristic C4 and C5 positive ions. Even though both ETFE and PVDF produce some of the same C3 positive ions, these positive ions come from different sequence structures. The negative ToF SIMS spectra of both ETFE and PVDF are totally dominated by F− (m/z=19) because F− is very stable, due to its largest electronegative value, and fluorine concentration in ETFE and PVDF is relatively high. These results indicate that the chain sequence structure has a significant effect on the positive ToF-SIMS spectra of ETFE and PVDF, especially in the high-mass range. However, the chain sequence structure does not have much effect on the negative spectra of ETFE and PVDF.
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