tacticity or MMD compared to other PP chains. The lower elution volume for the
second component of the 80
C and 90
C fractions (3.7 mL) as compared to the
same component for the 30
C and 60
C fractions (4.2 mL) indicates the longer
ethylene sequences present in these fractions (30
C and 60
C). For the late eluting
Fig. 3.51 HT-HPLC-FTIR analysis for the bulk sample 3VA. (a) Overlay of the ELSD response
and Gram-Schmidt profile. (b), (c) and (d) show the individual linked spectra extracted from the
Gram-Schmidt profile at elution volumes of 1.75 mL, 3.3 mL and 5.15 mL, respectively (reprinted
from [111] with permission of Elsevier)
138
3 Column-Based Chromatographic Techniques
second component of the 80
C and 90
C fractions (3.7 mL) as compared to the
same component for the 30
C and 60
C fractions (4.2 mL) indicates the longer
ethylene sequences present in these fractions (30
C and 60
C). For the late eluting
Fig. 3.51 HT-HPLC-FTIR analysis for the bulk sample 3VA. (a) Overlay of the ELSD response
and Gram-Schmidt profile. (b), (c) and (d) show the individual linked spectra extracted from the
Gram-Schmidt profile at elution volumes of 1.75 mL, 3.3 mL and 5.15 mL, respectively (reprinted
from [111] with permission of Elsevier)
138
3 Column-Based Chromatographic Techniques