 |
|
 |
|
|
| Volume 5, Issue 02 - 2009 |
|
|
| 4 |
SELF-ORGANIZED POLYSTYRENE-POLYLACTIDE BLOCK COPOLYMERS: SYNTHESIS, ORIENTATION, AND USE AS NANOSTRUCTURED PRECURSORS TO FUNCTIONAL MESOPOROUS POLYMERS |
| |
| Pages 44-51 |
| |
| TAREK ANTOUN1, BLAZEJ GORZOLNIK1, PATRICK DAVIDSON2, ISABELLE BEURROIES3, RENAUD DENOYEL3, and DANIEL GRANDE1,*
|
| |
1 Institut de Chimie et des Materiaux Paris-Est, CNRS – Universite Paris XII, 2, rue Henri Dunant, 94320 Thiais, France
2 Laboratoire de Physique des Solides, CNRS – Universite Paris-Sud, 91405 Orsay, France
3 Laboratoire Chimie Provence, CNRS – Universites d’Aix-Marseille I, II et III, 13331 Marseille, France
|
| |
| Received 4 June 2009 ; accepted 12 June 2009 |
| |
| Over the past decades, self-organized block copolymers have received great attention and they have been seriously con¬sidered for nanotechnological application. The use of these copolymers as nanostructured precursors with controlled architectures is a promising approach for achieving functionalized mesoporous membranes. Novel carboxy (COOH)-functionalized mesoporous polystyrene samples were derived from the selective degradation of the polyester block as¬sociated with polystyrene-block-poly(D,L-lactide) (PS-b-PLA) diblock copolymers. The combination of atom transfer radical polymerization (ATRP) and ring-opening polymerization (ROP) mechanisms enabled the synthesis of diblock copolymers possessing carboxylic acid functionality at the junction between both blocks. The nanodomains of such co¬polymers were aligned upon shear flow through the use of a channel die. Under mild alkaline conditions, the quantitative hydrolysis of the polyester nanodomains afforded mesoporous materials with COOH-coated pore walls. The PS-b-PLA precursors as well as the resulting porous systems were carefully analyzed by size exclusion chromatography (SEC), 1H NMR, scanning electron microscopy (SEM), and two-dimensional small-angle X-ray scattering (2-D SAXS). Moreover, the specific surface area and pore size distribution were determined by nitrogen sorption porosimetry.
Keywords: N/A |
| |
back |
|
|
|
|
|
|