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Liquid chromatography under limiting conditions

A mixed-mode method called liquid chromatography under limited conditions of adsorption has been described and applied to analyzing co-polymer composition of poly(styrene)-co-(methylmethacrylate).41 The polymer, dissolved in a good solvent, was injected onto a GPC column and eluted with a poor solvent. The polymer partially adsorbed to the column, allowing the plug of injection solvent to catch up with the adsorbed polymer and desorb it. [Pg.379]

Liquid Chromatography under Limiting Conditions of Enthalpic Interactions.483... [Pg.447]

The principle of LC LC separation with a narrow zone of an adsorb injected before sample solution called liquid chromatography under limiting conditions of desorption (LC LCD) is evident from Figure 16.12. It is also possible to apply multiple barriers in order to separate three and more components, such as statistical copolymers of different compositions or parent homopolymers from diblock copolymers [232]. The basic features of the LC LC methods are the following ... [Pg.483]

The latter solubility based methods do not directly belong to chromatography, however, they can be offline combined with polymer HPLC. Moreover, the solubility effects are directly employed in some coupled chromatographic methods (compare section 11.8.4, Eluent Gradient Polymer HPLC), while some of them employ the tendencies to phase separation rather than the complete precipitation processes (see section 11.8.6, Liquid Chromatography under Limiting Conditions of Enthalpic Conditions). [Pg.242]

LIQUID CHROMATOGRAPHY UNDER LIMITING CONDITIONS OF ENTHALPIC INTERACTIONS... [Pg.314]

FIGURE 18 Schematic representation of liquid chromatography under limiting conditions of enthalpic interactions. The adsorption retention mechanism is exemplified. Narrow zone of retention promoting zone, barrier B is injected in front of sample. For further e q)lanation, see the text. [Pg.315]

LC-LCD Liquid chromatography under limiting conditions of desorption... [Pg.3]

Fig. 13. Retention volume obtained by liquid chromatography under limiting conditions of adsorption (squares, diamonds) and by SEC (crosses) for random homopolymers of various composition. (Adapted from [153] with permission)... Fig. 13. Retention volume obtained by liquid chromatography under limiting conditions of adsorption (squares, diamonds) and by SEC (crosses) for random homopolymers of various composition. (Adapted from [153] with permission)...
Berek D, Kitayama T, Hatada K, Ihara H, Capek I, Borsig E. Liquid chromatography under limiting conditions of desorption, IV. Separation of macromolecules according to their stereoregularity. Polymer J [Tokyo. Japan] 2009 41 1144—51. [Pg.124]

Berek D. Separation of parent homopolymers from diblock copolymers by liquid chromatography under limiting conditions of desorption, 4. Role of eluent and temperature. J Sep Sci 2010 33 3476—93. [Pg.124]

The applicability of LC LC to the (ultra) high-molar-mass polymers. Contrary to liquid chromatography under critical conditions, LC LC likely exhibits no upper limit of the sample molar mass [234]. On the other hand, if the difference in elution rates of the barrier forming small molecules and the oligomeric species is too small, the LC LC separation becomes insufficient. As a result, LC CC and LC LC may be considered mutually complementary from the point of view of their applicability in the... [Pg.483]

Macko, T. endHunkeler, D. Liquid Chromatography under Critical and Limiting Conditions A Survey of Experimental Systems for Synthetic Polymers. Vol. 163, pp. 61-136. [Pg.238]

All above homopolymers are used also for the identification of suitable conditions for the coupled polymer HPLC techniques. Typical examples are liquid chromatography under critical (LC CC) and limiting (LC LC) conditions, and eluent gradient liquid chromatography (EG LC). For the development of latter methods, several defined statistical and block copolymers are available. [Pg.491]

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