Biomedical Engineering Reference
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Fig. 11.9
Positive ion FAB spectra of the oligomers present in the crude PEA-PET blend melt-
mixed at 290
ı
Cfor0min(
a
), for 20 min (
b
), for 270 min (
c
). Reprinted from [
54
] with permission
from the copyright holder ACS 1992
(0, 20, and 270 min, respectively) [
54
]. The FAB spectrum of the initial mixture
(M0, Fig.
11.9
a) is quite similar to that of pure PEA and does not show peaks cor-
responding to PET oligomers. In fact, the PET sample used for the blend had been
completely freed from all the low molar mass oligomers before mixing it with the
PEA. The mass spectra of the samples obtained after 20 min (M20, Fig.
11.9
b) and
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