Styrene divinylbenzene copolymers. Influence of diluent mixture on matrix structure

Poinescu, Ignat; Beldie, Camelia

doi:10.1002/apmc.1988.051640104

Cited by 22 publications

(5 citation statements)

References 10 publications

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“…Suspension copolymerization in the presence of solvents referred to as diluents is a well‐known technique for the preparation of heterogeneous structures with good properties. Thermodynamically good solvents produce structures with small pores while bad solvents produce structures with large pores 4, 10, 11. In our present study, toluene, heptane, and their mixtures were employed as diluents and their effect on porosity of styrene–DVB copolymer beads was examined.…”

Section: Resultsmentioning

confidence: 98%

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Suspension copolymerization of styrene and divinylbenzene: Formation of beads

Gupta

Beldar

Tank

2006

J of Applied Polymer Sci

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Suspension copolymerization of styrene and divinylbenzene (DVB) was carried out using benzoyl peroxide as initiator and magnesium hydroxide as suspending agent in water at 80°C under nitrogen atmosphere to produce styrene-DVB copolymer beads. These beads were characterized by infrared spectroscopy, thermal gravimetric analysis, and scanning electron microscopy. Porosity generated in styrene-DVB copolymer beads by incorporation of solvents in the polymerization system was confirmed by SEM micrograph, apparent density, swelling measurements, and Brunauer, Emmett, Teller surface area.

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Section: Resultsmentioning

confidence: 98%

“…However, copolymerization of styrene and DVB has not been studied in presence of Mg(OH) 2 to achieve styrene–DVB copolymer spheres. Further inert diluents (solvents, non solvents, or polymers) were incorporated during polymerization to produce porous and heterogenous structures in styrene–DVB copolymers 3, 4…”

Section: Introductionmentioning

confidence: 99%

Suspension copolymerization of styrene and divinylbenzene: Formation of beads

Gupta

Beldar

Tank

2006

J of Applied Polymer Sci

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“…When mixtures of solvating and non-solvating diluents are used the resins show porous structures with intermediary characteristics regarding the resins prepared with pure diluents (18). The effects of synthesis conditions on the swelling properties are considerably more complex for resins obtained with diluent mixtures.…”

Section: Non-solvating Diluent As a Porogen Agentmentioning

confidence: 99%

Packings for Size Exclusion Chromatography: Preparation and Some Properties

Horák

Hradil

Beneš

1996

ACS Symposium Series

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Materials used as packings in size-exclusion chromatography can be divided into organic and inorganic ones. Organic packings include both synthetic and natural products. The preparation of these matrices, the mechanism of porous structure formation, depending on synthesis conditions, as well as the properties of packings, are reviewed.Since the column is the heart of any chromatographic system, the choice of packing greatly affects the success of any analysis. The basic requirements for the packing material for size-exclusion chromatography (SEC) columns include chemical inert ness and minimal adsorption of separated compounds so that the retention may be strictly based on hydrodynamic volume. Further requirements include high porosity which can be either permanent in macroporous resins, or swelling in low-crosslinked polymers. In addition to the chemical properties, the importance of physical pro perties such as the particle size must be stressed to achieve an adequate resolution of the packing. The particles should be spherical and uniform in size to minimize mass transfer limitations. Since the column separation efficiency increases with decreasing particle size, the size should be as small as possible, however, with good flow properties. High-speed, high-resolution chromatography also sets special re quirements for geometrical and mechanical properties. They play a decisive role in the lifetime of the packing and the stability of the flow-rates through the column. It is therefore desirable that all the factors outlined above should be taken into account when choosing the packing. Generally, packings can be divided into universal and those that have a specific effect or "tailor-made" packings. A universal packing covers a broad molecular-weight distribution of the components of an unknown sam ple. Such preliminary assessment allows the subsequent choice of a resin that has the optimum properties for a given separation problem.Chromatographical packings have been already systematically reviewed in many papers and monographs (7-9). The aim of article is to review the synthesis, morphology and other properties of packings which are important for SEC.

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“…Após a elucidação do mecanismo pelo qual a estrutura porosa era formada, muitos esforços foram dedicados ao estudo da influência das condições de síntese sobre a porosidade final dos copolímeros à base de divinilbenzeno. Estudos sobre a natureza do diluente, o grau de diluição e o teor de agente reticulador foram feitos embasados também em determinações de propriedades porosas dos materiais 9,12,22,23,[43][44][45][46][47][48][49][50] . A partir daí, passou-se a utilizar tais conhecimentos para se obter materiais com características porosas definidas para uma dada aplicação 24,51,52 .…”

Section: Porosidade Em Copolímeros à Base De Divinilbenzenounclassified