Marie Horká

Immobilized stationary phase on the basis of polyethylene glycol cross-linked with pluriisocyanates of the Desmodur type

SummaryThe preparation of an immobilized stationary phase based on Carbowax 20M is described. The stationary phase cross-linking was carried out with Desmodur N 75 or Desmodur L 75, pluriisocyanates. The properties of the prepared stationary phases are compared.

Effect of repeated cross-linking of SE-54 stationary phase film on the chromatographic properties of capillary columns

Abstract The effects of repeated cross-linking of SE-54 stationary phase with azo- tert. -butane on the degree of stationary phase film immobilization and on the chromatographic properties were studied. The optimum numbers of repeated immobilizations in the columns for gas and liquid chromatography were determined. Excessive repetition of immobilization adversely affected the chromatographic properties. The contribution of chemical bonding to the degree of stationary phase immobilization was studied with capillaries silylated with octamethylcyclotetrasiloxane.

Comparison of some properties of immobilized polyethylene glycol type stationary phases modified with an acid

SummaryCapillary columns coated with acid-modified poly-(ethylene glycol)-type immobilized stationary phases have been studied. The thermostability and chromatographic behaviour of the columns and the stability of the coated films after washing with different solvents were investigated.