Octylphenoxy terminated PEO

As a typical application, the separation of an octylphenoxy-terminated PEO with respect to the terminal groups by LCCC is presented in Fig. 17.6. Similar to previous investigations on RP-18 stationary phases (Gorshkov et al., 1990 Pasch and Zammert, 1994), the critical eluent composition was achieved with methanol-water 86 14% by volume. Five well-separated peaks appeared in the chromatogram, which could be identified by MALDI-TOF mass spectrometry as being different functionality fractions. Accordingly, separation took place strictly with respect to the chemical structure of the end groups. 

FIGURE 17.7 Contour plot of the two-dimensional separation of an octylphenoxy terminated PEO sample (reprinted from Adrian et al., 1998, with permission of Advanstar Communications, UK). (See color plate.)... 

---