 |
|
 |
|
|
| Volume 2, Issue 02 - 2006 |
|
|
| 2 |
Cross-Linked Polymer Microparticles : Characterization by Size Exclusion Chromatography Using Universal Calibration |
| |
| Pages 53-60 |
| |
| Sebastien Rouzeau1, Francoise Mechin1, Jean-Pierre Pascault1, Benoit Magny2 |
| |
1 Laboratoire des Matériaux Macromoléculaires / IMP - UMR CNRS 5627, Bât. Jules Verne, INSA Lyon
20, avenue Albert Einstein - F-69621 Villeurbanne Cedex - France
2 Cray Valley - Total Chimie, Centre de Recherche de l'Oise, APAC, Parc Technologique ALATA - BP 22
F-60550 Verneuil-en-Halatte - France |
| |
| Received 20 June 2006; accepted 4 October 2006 |
| |
Cross-linked Polymer Microparticles (CPMs), commonly known as microgels, have been prepared and characterized by Size Exclusion Chromatography (SEC) using the principle of universal calibration (UC). Not only has SEC-UC proved itself a very useful method to determine molar masses of CPMs, but it also allowed an on-line measurement of their exponent α in Mark-Houwink-Sakurada (MHS) equation, i.e. [η]=KMα. As cross-linked particles, CPMs keep their spherical shape in solution and show values of exponent α lower than 0.5. On the contrary, homologous linear macromolecules display higher values of α, about 0.6-0.8. SEC-UC also provides values for the radius of gyration, Rz, and is much more sensitive to the presence of low molar mass species as compared to SEC using Multi Angle Laser Light Scattering (MALLS) detector.
Keywords: cross-linked polymer microparticle; microgels; size exclusion chromatography; universal calibration |
| |
back |
|
|
|
|
|
|