Schiff Base Mediated Sol-Gel Polymerization

Lindquist, D. A.; Harrison, Christopher Michael; Williams, Bernard L.; Morris, R. D.

doi:10.1557/proc-435-427

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…We reported a sol−gel method to prepare mesoporous alumina from a series of reactions. , In this method triethylaluminum is combined with a primary amine or ammonia in a hydrocarbon solvent to produce diethylaluminum amide and an equivalent of ethane. An aldehyde or ketone then is added to form ethylaluminoxane (EAO), an imine, and a second equivalent of ethane.…”

Section: Introductionmentioning

confidence: 99%

Porous Alumina Prepared from Diethylaluminum Amide, Acetone, and Water

et al. 2002

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A previously described synthetic method was modified to improve the porosity of the alumina product. The compound (Et2AlNH2)3 was prepared from ammonia and triethylaluminum (Et3Al) in toluene solvent. Addition of acetone to form a solution of ethylaluminoxane (EtAlO) and acetonine (2,2,4,4,6-pentamethyl-2,3,4,5-tetrahydropyrimidine) was followed by addition of two equivalents of water to give an alumina precursor. Alumina precursors also were prepared by the direct hydrolysis of (Et2AlNH2)3. Powder X-ray diffraction, 27Al MAS NMR, and N2 adsorption/desorption isotherms were used to analyze the aluminas after calcination of the precipitates. The aluminas exhibited high pore volume and surface area, and they were amorphous after calcination at 500 °C. One alumina showed a significant fraction of pentacoordinate aluminum after heating to 300 °C in air or 500 °C in steam atmosphere. The products crystallized as α-Al2O3 at the low temperature of 1000 °C, which reduces their applicability for catalysts. Synthesis variables and their effects on alumina properties are discussed.

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Section: Introductionmentioning

confidence: 99%

Porous Alumina Prepared from Diethylaluminum Amide, Acetone, and Water

et al. 2002

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“…Dynamic imine bond can be obtained without expensive catalyst in Schiff base reaction 64 . Schiff base is generally prepared by aldehyde or ketone and amine, 65–66 and the exchange reaction is adjusted according to the ratio of raw materials.…”

Section: Dynamic Covalent Bondmentioning

confidence: 99%

Recent progress of biomass based self‐healing polymers

Song

Kou

et al. 2021

J of Applied Polymer Sci

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Self‐healing polymer materials have been developed rapidly over the past 20 years, which can replace thermosetting materials to a certain extent, repair damage without manual intervention, prolong service life, and compress usage cost. The self‐healing polymer materials derived from biomass resources can reduce the dependence on traditional non‐renewable resources such as petroleum. The structures and properties of biomass based self‐healing polymer materials are of great significance for their processing, recycling and self‐healing. In this paper, the research progress of bio‐based self‐healing polymer materials based on dynamic non‐covalent bonds and dynamic covalent bonds including hydroxyl ester, Schiff base, disulfide bond, and hydroxyl urethane derived from vegetable oil, lignin, cellulose, vanillin and natural rubber were reviewed, and the dynamic non‐covalent bonds and dynamic covalent bonds were also introduced. The applications of various dynamic covalent bonds and dynamic non‐covalent bonds in the design and construction of polymer materials were reviewed, and the future development of dynamic covalent polymer materials was prospected.

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Advances in sol‐gel based columns for capillary electrochromatography: Sol‐gel open‐tubular columns

Malik

2002

Electrophoresis

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The development of sol-gel open-tubular column technology in capillary electrochromatography (CEC) is reviewed. Sol-gel column technology offers a versatile means of creating organic-inorganic hybrid stationary phases. Sol-gel column technology provides a general approach to column fabrication for microseparation techniques including CEC, and is amenable to both open-tubular and monolithic columns. Direct chemical bonding of the stationary phase to the capillary inner walls provides enhanced thermal and solvent stability to sol-gel columns. Sol-gel stationary phases inherently possess higher surface area, and thus provide an effective one-step alternative to conventional open-tubular column technology. Sol-gel column technology is applicable to both silica-based and transition metal oxide-based hybrid stationary phases, and thus, provides a great opportunity to utilize advanced material properties of a wide range of nontraditional stationary phases to achieve enhanced selectivity in analytical microseparations. A wide variety of stationary phase ligands can be chemically immobilized on the capillary inner surface using a single-step sol-gel procedure. Sol-gel chemistry can be applied to design stationary phases with desired chromatographic characteristics, including the possibility of creating columns with either a positive or a negative charge on the stationary phase surface. This provides a new tool to control electroosmotic flow (EOF) in the column. Column efficiencies on the order of half a million theoretical plates per meter have been reported for sol-gel open-tubular CEC columns. The selectivity of sol-gel stationary phases can be easily fine-tuned by adjusting the composition of the coating sol solution. Open-tubular columns have significant advantages over their packed counterparts because of the simplicity in column making and hassle-free fritless operation. Open-tubular CEC columns possess low sample capacity and low detection sensitivity. Full utilization of the analytical potential of sol-gel open-tubular columns will require a concomitant development in the area of high-sensitivity detection technology.

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Schiff Base Mediated Sol-Gel Polymerization

Cited by 3 publications

References 2 publications

Porous Alumina Prepared from Diethylaluminum Amide, Acetone, and Water

Porous Alumina Prepared from Diethylaluminum Amide, Acetone, and Water

Recent progress of biomass based self‐healing polymers

Advances in sol‐gel based columns for capillary electrochromatography: Sol‐gel open‐tubular columns

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