Polyacrylate/SiO2 nanocomposites prepared by combining non-aqueous sol–gel process and miniemulsion polymerization

Yang, Lei; Xu, Yangsheng; Qiu, Shouji; Zhang, Ya

doi:10.1007/s10965-012-0030-3

Cited by 12 publications

(6 citation statements)

References 21 publications

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“…In this sense, the use of immobilization technology to specific support materials or the generation of hybrids systems using protein as a scaffold to conjugate with the corresponding transition metal catalysts has been a successful example to create heterogeneous artificial metalloenzymes [9][10][11][12]. In particular, the application of enzymes with high catalytic versatility could generate higher possibilities, depending on the transition metal or metal binding ligands inserted.…”

Section: Introductionmentioning

confidence: 99%

“…The catalytic capacity of the ruthenium organometallic complex in the different protein-conjugates was evaluated in the ring-closing metathesis (RCM), among the most important C-C bond forming reactions [18][19][20] of diethyldiallymalonate (1) (Scheme 1) at mild conditions. In this sense, the use of immobilization technology to specific support materials or the generation of hybrids systems using protein as a scaffold to conjugate with the corresponding transition metal catalysts has been a successful example to create heterogeneous artificial metalloenzymes [9][10][11][12]. In particular, the application of enzymes with high catalytic versatility could generate higher possibilities, depending on the transition metal or metal binding ligands inserted.…”

Section: Introductionmentioning

confidence: 99%

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Design of Heterogeneous Hoveyda–Grubbs Second-Generation Catalyst–Lipase Conjugates

2016

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Heterogeneous catalysts have been synthesized by the conjugation of Hoveyda-Grubbs second-generation catalyst with a lipase. The catalytic properties of the organometallic compound in solution were firstly optimized, evaluating the activity of Ru in the ring-closing metathesis of diethyldiallymalonate at 25 • C at different solvents and in the presence of different additives. The best result was found using tetrahydrofuran as a solvent. Some additives such as phenylboronic acid or polyetheneglycol slightly improved the activity of the Ru catalyst whereas others, such as pyridine or dipeptides affected it negatively. The organometallic compound immobilized on functionalized-surface materials activated with boronic acid or epoxy groups (around 50-60 µg per mg support) and showed 50% conversion at 24 h in the ring-closing metathesis. Cross-linked enzyme aggregates (CLEA's) of the Hoveyda-Grubbs second-generation catalyst with Candida antarctica lipase (CAL-B) were prepared, although low Ru catalyst was found to be translated in low conversion. Therefore, a sol-gel preparation of the Hoveyda-Grubbs second-generation and CAL-B was performed. This catalyst exhibited good activity in the metathesis of diethyldiallymalonate in toluene and in aqueous media. Finally, a new sustainable approach was used by the conjugation lipase-Grubbs in solid phase in aqueous media. Two strategies were used: one using lipase previously covalently immobilized on an epoxy-Sepharose support (hydrophilic matrix) and then conjugated with grubbs; and in the second, the free lipase was incubated with organometallic in aqueous solution and then immobilized on epoxy-Sepharose. The different catalysts showed excellent conversion values in the ring-closing metathesis of diethyldiallymalonate in aqueous media at 25 • C.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Heterogeneous Hoveyda–Grubbs Second-Generation Catalyst–Lipase Conjugates

2016

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“…In this case, the medium between the detached elements of the 3D structure has different rheological properties and can cause a typical flow characteristic of suspensions or emulsions. In other words, the system does not change into a homogeneous 3D gel during shearing, but into emulsion in which gel is the dispersed phase and water is the dispersive phase .…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of cross‐linked poly(sodium acrylate)/sodium silicate hydrogels

Mastalska‐Popławska

Izak

Wójcik

et al. 2019

Polymer Engineering & Sci

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Transparent and intumescent polymer-silicate hydrogels were synthesized by free-radical polymerization, in the presence of the redox initiators system (potassium persulphate/sodium thiosulphate) and cross-linking monomer (N,N 0 -methylenebisacrylamide). Hydrogels obtained in such a manner were rheologically tested and it was found that the same sample with a different sodium acrylate concentration polymerized faster when its content was lower. The spectroscopic and thermal analysis proved that the polymer combines with sodium silicate by hydrogen bonds and during thermal degradation only small polymer fragments and water molecules were released. NMR studies have shown that the content of water glass causes shorter relaxation times. Conducted fire tests showed that glass panes systems filled with the tested hydrogels meet the relevant construction standards and what is their big advantage, a thin 1 mm layer of polymer-silicate gel is sufficient for this purpose. We believe that these results will contribute to the development of intumescent hydrogels with enhanced fireretardant properties.

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“…According to the silica chemistry, mesoporous SiO 2 is a versatile material [19,20] with valuable attributes such as biocompatibility, stability, large uniform pores and inert to redox reactions compared with the organic coating materials, Zhang et al [21] have prepared a novel CO 2 sorbent, mesoporous silica SBA-15 impregnated with AN-modified TEPA and investigate the CO 2 adsorption capacity and the stability of mesoporous silica. Moreover the presence of an abundance of hydroxyl groups on the silica surface, offers ease of subsequent surface modifications with different functional groups, thus functionalized as an ideal shell composite to protect the inner magnetite core [22], the mesopore channels structure of the silica layer significantly enhances the mass transfer and diffusion properties in reaction system, and which can improve the catalytic efficiency of the reaction to some extent [23,24].…”

Section: Introductionmentioning

confidence: 99%

Factors affecting the physicochemical properties of the modified core/shell NH2–SiO2@NZVI nanoparticles

Guan

Shu

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Polyacrylate/SiO2 nanocomposites prepared by combining non-aqueous sol–gel process and miniemulsion polymerization

Cited by 12 publications

References 21 publications

Design of Heterogeneous Hoveyda–Grubbs Second-Generation Catalyst–Lipase Conjugates

Design of Heterogeneous Hoveyda–Grubbs Second-Generation Catalyst–Lipase Conjugates

Synthesis and characterization of cross‐linked poly(sodium acrylate)/sodium silicate hydrogels

Factors affecting the physicochemical properties of the modified core/shell NH2–SiO2@NZVI nanoparticles

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