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Liquid chromatography limiting conditions

Keywords Liquid chromatography critical conditions limiting conditions synthetic polymers... [Pg.61]

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]

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]

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 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]

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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