An investigation of the morphology of glycidyl methacrylate copolymers using inverse size-exclusion chromatography

Jeřábek, Karel; Setínek, K.; Hradil, J.; Švec, František

doi:10.1016/0167-6989(87)90189-9

Cited by 5 publications

(5 citation statements)

References 8 publications

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“…After filling the pores with a thermodynamically good solvent such as dichloroethane, this surface polymer layer swells. The presence of such swellable layers in various highly crosslinked polymers was confirmed long ago by Jerabek et al utilizing size exclusion chromatography. , Once swollen, this layer can be crosslinked via the Friedel−Crafts reaction to create the desired network of nanopores that significantly increases the surface area.…”

Section: Resultsmentioning

confidence: 93%

High Surface Area Nanoporous Polymers for Reversible Hydrogen Storage

et al. 2006

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Hydrogen adsorption using a series of nanoporous synthetic polymers has been studied. Promising results were obtained during the screening of commercially available porous polymer beads; of the polymers considered, hypercrosslinked Hypersol-Macronet MN200 resin exhibited the highest adsorption capacity for hydrogen. This initial success triggered the development of our own high surface area hypercrosslinked materials. Subjecting gel-type and macroporous vinylbenzyl chloride-based precursors swollen in dichloroethane to a Friedel−Crafts reaction catalyzed by iron trichloride afforded beads with surface areas of 1 930 and 1 300 m2/g, respectively, as calculated using the BET equation. The former polymer reversibly stores up to 1.5 wt % H2 at a pressure of 0.12 MPa and a temperature of 77.3 K. The initial heat of adsorption of hydrogen molecules onto this polymer is 6.6 kJ/mol.

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Section: Resultsmentioning

confidence: 93%

High Surface Area Nanoporous Polymers for Reversible Hydrogen Storage

et al. 2006

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“…Functionalized monomers have a tendency to form intermolecular interactions increasing the probability of polymer chain entanglement resulting in physical cross-linking. 45 The effect that only the porogen most similar to the functional monomer is able to reduce the physical cross-linking was already observed during the preparation of copolymers of 4-vinylpyridine and divinylbenzene. 46 Similarly "compact" polymer matrix was formed in the absence of modifying solvents during the preparation of polymer AD11.…”

Section: Resultsmentioning

confidence: 93%

“…The other solvents, toluene and dichloromethane apparently acted as precipitants and due to higher polymer chain entanglement, their polymer matrix has lower swellability. Functionalized monomers have a tendency to form intermolecular interactions increasing the probability of polymer chain entanglement resulting in physical cross-linking . The effect that only the porogen most similar to the functional monomer is able to reduce the physical cross-linking was already observed during the preparation of copolymers of 4-vinylpyridine and divinylbenzene .…”

Section: Resultsmentioning

confidence: 99%

Porogenic Solvents Influence on Morphology of 4-Vinylbenzyl Chloride Based PolyHIPEs

et al. 2008

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Poly(high internal phase emulsion) materials were prepared from concentrated emulsions containing 4-vinylbenzyl chloride as the reactive monomer and divinylbenzene as the cross-linker. Emulsions consisted of 80 vol. % aqueous phase (water, CaCl 2 , initiator) and 20 vol. % of organic phase (monomers, surfactant Span 80 and a porogenic solvent). Polymerized samples were purified and investigated for morphology and porosity by scanning electron microscopy, nitrogen adsorption/ desorption and inverse steric exclusion chromatography (ISEC). It was found that no substantial additional dry porosity was achieved by the addition of solvents (as determined by nitrogen adsorption) while wet microporosity was substantially improved as determined by the ISEC method. The process of drying the polyHIPE materials also influenced the wet porosity.

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“…In a simplified manner, this view can be interpreted as a hard core surrounded by "grafted" linear or weakly cross-linked chains capable of considerable solvation [97]. This has also been confirmed by Jerabek's inverse SEC study [98]. In the measurement of porous properties such as dynamic nitrogen desorption and mercury intrusion porosimetry applied to polymer beads in the dry state, the loose chains are not solvated and form part of the solid surface of the microglobules.…”

Section: Preparation Of Porous Beadsmentioning

confidence: 84%

Methacrylate‐based chromatographic media

Beneš

Horák

Švec³

2005

J of Separation Science

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This review summarizes the preparation and application of chromatographic separation media based on methacrylate monomers with a major focus on highly crosslinked macroporous beads prepared from 2-hydroxyethyl methacrylate and glycidyl methacrylate, respectively. The effects of process variables such as composition of the polymerization mixture that includes monomers, porogenic solvents, and free radical initiator, suspension stabilizer, reaction temperature, and stirring are detailed for both classical and templated suspension polymerization. In addition, specific features of the preparation of monodisperse beads are also discussed. The performance of methacrylate-based separation media is demonstrated on numerous separations in a variety of chromatographic modes.

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An investigation of the morphology of glycidyl methacrylate copolymers using inverse size-exclusion chromatography

Cited by 5 publications

References 8 publications

High Surface Area Nanoporous Polymers for Reversible Hydrogen Storage

High Surface Area Nanoporous Polymers for Reversible Hydrogen Storage

Porogenic Solvents Influence on Morphology of 4-Vinylbenzyl Chloride Based PolyHIPEs

Methacrylate‐based chromatographic media

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