Advanced Materials Research Vols. 554-556

Abstract: A novel dibromo-substituted HBC derivative, whose side chains contains oxygen heteroatoms, has been successfully synthesized by Diels-Alder reaction of asymmetric synthesis. It possesses bromo-functional groups to provide possibility to further synthesize more complex HBC derivatives. The final compound’s structure has been confirmed by ¹HNMR, ¹³CNMR and MALDI-TOF mass spectrometry.

Abstract: A γ-glycidyloxypropyltrimethoxysilane (GPTMS) modified titania hydrosol was prepared. The influence of GPTMS modification on the tatania sol was investigated by dimension dispersion, Zeta potential, FT-IR, and the ultraviolet transmittance of the treated PET fabric. The results show that the Zeta potential of nano-particles increased from 2.1mV to 35.6mV. And there was no obvious difference in dimension dispersion and FT-IR between the tatania gel and the modified-tatania gel. The ultraviolet transmittance of the PET fabric treated the modified-sol and the unmodified-sol also did not show significant shift.

Abstract: A facile and efficient methodology for the preparation of 3-aryl-1,1,2,2-tetracyanocyclopropanes is described. Arsonium bromides 2 reacted with benzylidenemalononitriles 1 in the presence of KF•2H2O to provide 3-aryl substituted tetracyanocyclopropanes 3 in high to excellent yields.

Abstract: Gas-phase methanol carbonylation over HMOR catalyst was investigated for the synthesis of dimethyl ether (DME) and acetic acid (HOAc). The results revealed that the selectivity of DME reached 98% and the methanol conversion was 45% under the reaction temperature of 493K. While, the selectivity of HOAc was 30% and the methanol conversion reached 80% when reaction temperature was increased to 573K. TEM, SEM, XRD, N2 physisorbtion, XPS and TG-DTG measurements were performed to characterize the texture and structure of the catalyst. Serious coking on the catalyst surface significantly limited the utilization of unmodified HMOR catalyst in the reaction.

Abstract: By employing thiamine (vitamin B1) as the catalyst, the synthesis of furoin from furfuraldeyde has been developed. Furoin is oxidized to furil by Cu(OAc)₂-NH₄NO₃ as an oxidant. The reaction condition is optimized and the reaction mechanism is discussed in this paper. The synthesized furoin and furil are characterized by means of Mass, IR and UV spectrum.

Abstract: 1,3,4-oxadiazole(OXD) and its derivatives have excellent thermal stability and oxidation resistance and strong blue fluorescence emission[1].Six novel compounds have been designed and and synthesized. And their structures were confirmed by 1HNMR,FT-IR MS, UV-vis absorption results showed that the maximum absorption wavelength appeared at 304 nm，and fluorescence spectroscopy results showed that they emit strong purple fluorescence in DMF solution.

Abstract: Methyl ferulate was synthesized by methanol and ferulic acid with strongly acidic cation exchange resin as catalyst under microwave irradiation. The effect of catalyst activity was investigate by single factor experiment. Amount of catalyst, microwave treatment time, microwave output power and methanlo/ ferulic acid ratio were investigate by single factor experiment and orthogonal experiments. The optimal reaction conditions were ferulic acid being 0.1mol, molar radio of ethanol to ferulic acid being 5:1, mass percent of resin being 30％ of the reagent, microwave power being 300W, reaction time being 25 min. The yield of product was 81.2％ under the potimal conditions. The catalytic characteristics of regenerated catalyst were stable and the yield of product may keep greater than 76% after the 732# resin used five times.

Abstract: Nitrogen-doped mesoporous carbon materials have been synthesized by using melamine-formaldehyde resin as carbon precursor and SBA-15 as a removable template. The structure of the materials was investigated by X-ray diffraction, BET specific surface area analysis, Fourier transform infrared spectroscopy, and thermogravimetric analysis. X-ray and BET studies confirmed that a pore nanostructure is inherited from the silica templates. Fourier transform infrared spectroscopy analysis showed N atoms are strongly bonded in the carbon structure in heterocycles or nitrile functions. These mesoporous nitrogen-doped carbon materials exhibits textural properties with BET surface areas ranging between 400 and 600 m²/g and uniform pore size(3.9 nm). The mechanism of carbonization process is studied by thermogravimetric analysis. The ratio of melamine/formaldehyde plays an important role during the carbonization process for the surface areas and textural properties, and element analysis reveals that the nitrogen content of the mesoporous carbon materials is as high as 10wt%.

Abstract: A brand new organic cationic monomer glycidyl allyl dimethyl ammonium chloride(GADAC) was synthesized with dimethylamine, allyl chlorine and epichlorohydrin to protect the oil and gas reservoirs from damage. The effect of temperature, pH, time and the mole ratio of reactants on cationic degree of GADAC was investigated by the orthogonal design experiments and then the effect of cation concentration on the cationic degree of GADAC was also studied. The optimal condition for synthesis was gained and the product was characterized by FIRS, and the results showed that the target-product had a very good performance of anti-expansion with a very high cationic degree of more than 97%.

Abstract: Started from Tung oil, a renewable biomass material of china, a new kind of bismaleimide, Tung oil-based bi-dihydrogen-maleimide (TOBBDHMI) was synthesized by the reaction of methyl-α-eleostearate-maleic anhydride adduct (MEMAA) and 4,4'-diphenylmethane disocyanate (MDI). The optimal conditions for synthesis were catalyst triethylamine dosage 1.0%, mole ratio of MEMAA to MDI 2.4:1, reaction temperature 75°C and reaction time 2 h, which gave yield 82.4% for TOBBDHMI (calculated from MDI). The melting point of the product was 186.6 °C~189.3 °C, initial decomposition temperature was 270 °C and final decomposition temperature was 510 °C, which showed the product has good heat resistance. The target product is potential to be used alone or with other bismaleimide monomers to improve polymeric materials’ heat resistance and/or mechanical properties.