Swellable ethylene glycol dimethacrylate-hydroxyethylmethacrylate copolymer beads

Kesenci̇, Kemal; Tuncel, Alï; Pi̇şki̇n, Erhan

doi:10.1016/1381-5148(96)00052-1

Cited by 64 publications

(40 citation statements)

References 36 publications

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“…For the different suspension polymerization systems, one of the important parameters controlling the size and the size distribution of microspheres is the stirring rate. The size and the size distribution of microspheres decrease clearly by increasing the rate of stirring as explained in the related literature [18]. The effect of stirring rate on the size and size distribution was investigated by using different stirring rates and the obtained results are shown in Table 2.…”

Section: The Effect Of Stirring Rate On the Size And Size Distributionmentioning

confidence: 98%

Preparation and characterization of polyethyleneglycolmethacrylate (PEGMA)-co-vinylimidazole (VI) microspheres to use in heavy metal removal

Uğuzdoğan

Denkbaş

Öztürk

et al. 2009

Journal of Hazardous Materials

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Section: The Effect Of Stirring Rate On the Size And Size Distributionmentioning

confidence: 98%

Preparation and characterization of polyethyleneglycolmethacrylate (PEGMA)-co-vinylimidazole (VI) microspheres to use in heavy metal removal

Uğuzdoğan

Denkbaş

Öztürk

et al. 2009

Journal of Hazardous Materials

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“…43 The proposed method was obtained by the combination of the principles of the polymerization method proposed by Nonaka et al 41 and the principles of suspension polymerizations investigated in our previous studies. [47][48][49][50] CMS (2.5 mL), EGDMA (0.75 mL), and AIBN (0.06 g) were dissolved in cyclohexane (3.6 mL). The resulting homogeneous phase was dispersed in the aqueous medium prepared by dissolution of PVA (0.1 g) in water (40 mL).…”

Section: Production Of Pcms Beadsmentioning

confidence: 99%

Immobilization of invertase onto crosslinked poly(p‐chloromethylstyrene) beads

Bahar

Tuncel

2001

J of Applied Polymer Sci

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ABSTRACT:Invertase was immobilized onto poly(p-chloromethylstyrene) (PCMS) beads that were produced by a suspension polymerization with an average size of 186 m. The beads had a nonporous but reasonably rough surface. Because of this, a reasonably large external surface area (i.e., 14.1 m 2 /g) could be achieved with the proposed carrier. A two-step functionalization protocol was followed for the covalent attachment of invertase onto the bead surface. For this purpose, a polymeric ligand that carried amine groups, polyethylenimine (PEI), was covalently attached onto the bead surface by a direct chemical reaction. Next, the free amine groups of PEI were activated by glutaraldehyde. Invertase was covalently attached onto the bead surface via the direct chemical reaction between aldehyde and amine groups. The appropriate enzyme binding conditions and the batch-reactor performance of the immobilized enzyme system were investigated. Under optimum immobilization conditions, 19 mg of invertase was immobilized onto each gram of beads with 80% retained activity after immobilization. The effects of pH and temperature on the immobilized invertase activity were determined and compared with the free enzyme. The kinetic parameters K M and V M were determined with the Michealis-Menten model. K M of immobilized invertase was 1.75 folds higher than that of the free invertase. The immobilization caused a significant improvement in the thermal stability of invertase, especially in the range of 55-65°C. No significant internal diffusion limitation was detected in the immobilized enzyme system, probably due to the surface morphology of the selected carrier. This result was confirmed by the determination of the activation energies of both free and immobilized invertases. The activity half-life of the immobilized invertase was approximately 5 times longer than that of the free enzyme.

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“…250 and 500 rpm). As explained in the related literature for different suspension polymerization systems [21,34,35], the average size reduced with increasing stir- Figure 3. ESRs of poly(GDMA-GDGDA) gel beads synthesized with different GDMA/GDGDA volume ratios at different pHs.…”

Section: Resultsmentioning

confidence: 90%

Synthesis and characterization of hydrophilic and spherical poly(glycerol dimethacrylate-co-glycerol-1,3-diglycerolate diacrylate) microbeads

Uğuzdoğan

2012

Designed Monomers and Polymers

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To cite this article: Erdal Uguzdogan (2013) Synthesis and characterization of hydrophilic and spherical poly(glycerol dimethacrylate-co-glycerol-1,3-diglycerolate diacrylate) microbeads, Designed Monomers and Polymers, 16:3, 250-262, DOI: 10.1080/15685551.2012 A new class of spherical and swellable microbeads was obtained by a newly proposed suspension polymerization protocol. Hydrophilic monomers in the form of crosslinking agent, glycerol dimethacrylate (GDMA), and glycerol 1,3-diglycerolate diacrylate (GDGDA) were copolymerized in an aqueous suspension medium. Poly(GDMA-co-GDGDA) microbeads were highly hydrophilic due to hydroxyl functionality from both crosslinking agents. In the proposed method, the organic phase including monomers and diluent (i.e. cyclohexanol) was dispersed in an aqueous medium by using poly(vinyl alcohol) as the stabilizer. Poly(GDMA-co-GDGDA) microbeads were obtained by changing GDMA/GDGDA ratio, monomer/diluent ratio, and stirring rate. The average size and size distribution properties, microbead yields, and the equilibrium swelling behavior of the gel beads were presented. Spherical and swellable bifunctional microbeads carrying hydroxyl-carboxyl or hydroxyl-amine groups were also obtained by including amine and carboxyl carrying functional monomers, 2-(dimethylamino)ethyl methacrylate, and methacrylic acid, respectively, in the suspension copolymerization proposed.

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Swellable ethylene glycol dimethacrylate-hydroxyethylmethacrylate copolymer beads

Cited by 64 publications

References 36 publications

Preparation and characterization of polyethyleneglycolmethacrylate (PEGMA)-co-vinylimidazole (VI) microspheres to use in heavy metal removal

Preparation and characterization of polyethyleneglycolmethacrylate (PEGMA)-co-vinylimidazole (VI) microspheres to use in heavy metal removal

Immobilization of invertase onto crosslinked poly(p‐chloromethylstyrene) beads

Synthesis and characterization of hydrophilic and spherical poly(glycerol dimethacrylate-co-glycerol-1,3-diglycerolate diacrylate) microbeads

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