[Todos] Importante conferencia ?PROGRESS IN LIQUID CHROMATOGRAPHY OF SYNTHETIC POLYMERS?de Dusan Berek

[lfama en df.uba.ar]

  Hola a todos: profesores, graduados y alumnos !

  El Laboratorio de Polímeros y Materiales Compuestos (LPMC) del Dep.  
de Física, y el Centro de Investigaciones en Hidratos de Carbono  
(CIHIDECAR) del Dep. de Química Orgánica, los invita a la conferencia  
que realizará el Dr. Dusan Berek del Instituto de Polímeros de la  
Academia de Ciencias Eslovaca, que se realizará el lunes 1º de  
diciembre de 2008 a las 11:00 hs. en el aula ?Venancio Deulofeu?, Dep.  
Química Orgánica, 3º piso, Pabellón II.

  La conferencia tratará el siguiente tema:

  "PROGRESS IN LIQUID CHROMATOGRAPHY OF SYNTHETIC POLYMERS"

  High performance liquid chromatography (HPLC) is at present the most  
important tool for molecular characterization of synthetic polymers.  
Present state and recent developments of the polymer HPLC methods will  
be elucidated.
Size exclusion chromatography. Molecular characteristics of man-made  
polymers include their molar mass, chemical structure, and physical  
architecture, all exhibiting certain distribution. Methods, which  
provide information on distribution of polymer molar masses are  
presently dominated by size exclusion chromatography (SEC). Critical  
assessment of SEC  will be presented.
Coupled methods of polymer HPLC. In order to characterize complex  
polymers, which exhibit more than one single distribution in their  
molecular characteristics, entropic (exclusion) retention mechanism of  
SEC must be combined with one or several enthalpic (interaction)  
retention mechanisms. These combinations result in coupled methods of  
high performance liquid chromatography of polymers (polymer HPLC). The  
aim of coupled methods of polymer HPLC is to suppress selectivity of  
separation according to one molecular characteristic so that another  
characteristic can be assessed independently and without  
interferences. Alternatively, the separation selectivity according to  
one characteristic is enhanced so that the second characteristic can  
be neglected. The already established and also novel coupled methods  
of polymer HPLC will be introduced. These are eluent and temperature  
gradient polymer HPLC, liquid chromatography under critical conditions  
of enthalpic interactions, liquid chromatography under limiting  
conditions of enthalpic interactions, and enthalpy assisted SEC.
Full retention-elution procedures. A specific group of modern methods  
for polymer separation represent the full retention ? elution  
procedures (FRE). In FRE, a complete polymer retention followed by a  
controlled, fast release and elution takes place within a HPLC-like  
column.. Principles and selected applications of the adsorption based  
FRE separations will be elucidated.
Two-dimensional polymer HPLC. Compresensive characterization of  
complex polymers in terms of all their molecular characteristics is  
hardly possible within one single separation column and applying just  
one separation step. Macromolecules have to be successively separated  
according to each characteristic applying optimized two? or multi-  
dimensional approaches. The latter represent an important challenge  
for research in macromolecular field. Strategies and achievements but  
also a multitude of problems in the area of two- dimensional  
separations of complex polymers utilizing tandem combinations of  
coupled methods, FRE and SEC will be presented.

  Los esperamos !!!