Mesoporous polymeric materials tailored from oligoester-derivatized Interpenetrating Polymer Networks

9 - Conference paper: 46th Microsymposium on Macromolecules - Nanostructured Polymers and Polymer Nanocomposites; JUL 08-AUG 12 2007; Prague (CZECH REPUBLIC)The utilization of semi-hydrolyzable Pligoester-derivatized interpenetrating Polymer Networks (IPNs) as nanostructured precursors provides a straightforward and effective route to novel (meso)porous networks. in a first stage, different types of poly(D,L-lactide)/poly(methyl methacrylate)-based lPNs were synthesized by resorting to the so-called in situ sequential method. in a second stage, the quantitative hydrolysis of the polyester sub-network afforded porous structures with pore sizes ranging from 10 to 100 nm. The potentialities offered by this versatile approach were discussed, and the porosity of the resulting methacrylic networks was examined by Scanning Electron Microscopy (SEM) and thermoporometry using Differential Scanning Calorimetry (DSC)

Matériaux polymères mésoporeux (nouvelles voies d'obtention à partir de réseaux semi-interpénétrés et interpénétrés de polymères partiellement hydrolysables)

Des réseaux (semi-)interpénétrés de polymères ((semi-)RIPs) à base de polyester aliphatique (oligomères du D,L-lactide ou de l' -caprolactone) et de poly(méthacrylate de méthyle) ont été synthétisés. Les cinétiques de formation des réseaux ont été examinées par spectroscopie infrarouge in situ. L'influence de divers paramètres structuraux, tels que la densité de réticulation du réseau méthacrylique ou la nature du polyester, a été étudiée. L'extraction des oligoesters linéaires et l'hydrolyse sélective du sous-réseau de polyester à partir des semi-RIPs et RIPs, respectivement, ont conduit à l'obtention de matériaux poreux. Les tailles de pores et leurs distributions ont été corrélées aux tailles de microdomaines dans les précurseurs. Cela a été expliqué par le calcul des paramètres d'interaction polymère-polymère. Les réseaux poreux ont été utilisés comme nanoréacteurs pour des polymérisations en milieu confiné et en tant que supports pour la chromatographie d'échange d'ions.(Semi-)Interpenetrating Polymer Networks ((semi-)IPNs) based on aliphatic polyester (D,L-lactide- or -caprolactone-containing oligomers) and poly(methyl methacrylate) were synthesized. The kinetics involved in network formation were examined by real-time near-infrared spectroscopy. The influence of various structural parameters, such as the cross-link density of the methacrylic network or the polyester nature, was investigated. The extraction of linear oligoesters and the hydrolysis of the polyester sub-network from the semi-IPNs and IPNs, respectively, led to the formation of porous materials. The pore sizes and their distributions were correlated to microdomain sizes in the precursors, which was explained by the calculation of polymer-polymer interaction parameters. Porous networks were used as nanoreactors for polymerizations in confined medium and as stationary phases for ion exchange chromatography.PARIS12-CRETEIL BU Multidisc. (940282102) / SudocSudocFranceF

Mesoporous crosslinked polymers tailored from (semi-)IPNs: Scope and limitations

10 - Conference proceedins/Meeting abstractInternational audienc

Biodegradable polymeric nanomaterials

International audienc

Polymer networks with defined porosity: design, synthesis, and characterization

10 - Conference proceedings/Meeting abstractInternational audienc

Nanoporous networks derived from functional semi-Interpenetrating Polymer Networks: preparation and use as ion-exchange chromatographic supports

1 - ArticleThe utilization of poly(epsilon-caprolactone) (PCL)/poly(methyl methacrylate-co-methacrylic acid)-based semi-Interpenetrating Polymer Networks as nanostructured precursors provides a straightforward and effective route for engineering COOH-functionalized nanoporous networks. Such functional frameworks can be used as cation-exchange supports in Ion-Exchange Chromatography for the separation of proteins, provided the structures contain a significant initial content of carboxylic acid functions. This investigation illustrates the major role played by the presence of the interconnected pores generated by the oligoester template in the protein retention. The resolution turns out to be better than that obtained with a classically prepared porous support using an organic solvent as a porogen

Functionalized porous networks obtained from semi-IPNs: Evaluation in ion-exchange chromatography

10 - Conference proceedins/Meeting abstractInternational audienc

Poly(d,l-lactide)/poly(methyl methacrylate) interpenetrating polymer networks: Synthesis, characterization, and use as precursors to porous polymeric materials

1 - ArticleThe use of semi-hydrolyzable oligoester-derivatized interpenetrating polymer networks (IPNs) as nanostructured precursors provides a straightforward and versatile approach toward mesoporous networks. Different poly(d,l-lactide) (PLA)/poly(methyl methacrylate) (PMMA)-based IPNs were synthesized by resorting to the so-called in situ sequential method. The PLA sub-network was first generated from a dihydroxy-telechelic PLA oligomer via an end-linking reaction with Desmodur® RU as a triisocyanate cross-linker. Subsequently, the methacrylic sub-network was created by free-radical copolymerization of methyl methacrylate (MMA) and a dimethacrylate (either bisphenol A dimethacrylate or diurethane dimethacrylate) with varying compositions (initial MMA/dimethacrylate composition ranging from 99/1 to 90/10 mol%). Both cross-linking processes were monitored by real-time infrared spectroscopy. The microphase separation developed in IPN precursors was investigated by differential scanning calorimetry (DSC). Furthermore, the quantitative hydrolysis of the PLA sub-network, under mild basic conditions, afforded porous methacrylic structures with pore sizes ranging from 10 to 100 nm -at most- thus showing the effective role of cross-linked PLA sub-chains as porogen templates. Pore sizes and pore size distributions were determined by scanning electron microscopy (SEM) and thermoporometry via DSC measurements. The mesoporosity of residual networks could be attributed to the good degree of chain interpenetration associated with both sub-networks in IPN precursors, due to their peculiar interlocking framework