Biomedical Engineering Reference
In-Depth Information
Fig. 11.8
FAB spectra of the three HB-HV copolyesters denoted as S6 (
a
), S7 (
b
), S3 (
c
).
Reprinted from [
52
] with permission from the copyright holder ACS 1991
94=6
72=28
c
HB
D 0:83
of
.Sample
S3 is not a mixture, it is a genuine HB-HV copolymer. The copolymer composi-
tion is very similar to the preceeding ones,
) plus HB-HV copolymer (composition
). Thus,
. Figure
11.8
reports FAB
spectra [
52
] of the three HB-HV copolyester S6, S7, S3. The MS intensities are
different indeed. From the analysis of MS data, it was concluded that MS is able
to discriminate a genuine HB-HV copolymer from a mixture. Bacterial copolyester
sequencing by MS is now performed routinely [
53
]. Poly(ethylene -terephthalate)
(PET for brief ) is important since it is used in plastic bottles and other items. The
sequence distribution and composition of the copolymers generated by melt mixing
of poly(ethylene terephthalate)/poly(ethylene adipate) blends (PET-PEA) were de-
termined by analysis of the FAB mass spectra of the oligomers present in the crude
blends or else formed by appropriate partial degradation (hydrolysis or aminolysis)
of the mixtures. Figure
11.9
shows the positive ion FAB spectra of the oligomers
present in the crude PEA-PET blend melt-mixed at
c
HB
D
0:83
290
ı
C for increasing times
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