有机皂土毛细管色谱柱用于对二甲苯的色谱分析

自行研制了有机皂土(Bentone-34)高效石英毛细管色谱柱。建立了对二甲苯中微量杂质的色谱分析方法。该法具有分离效果好,分析速度快的优点。

Br?nsted acid catalyzed addition of N^1-p-methyl toluenesulfonyl triazole to olefins for the preparation of N^2-alkyl 1,2,3-triazoles with high N^2-selectivity

An efficient new method has been developed to synthesize N2‐alkyl 1,2,3‐triazole products by tol‐uenesulfonic acid （TsOH） catalyzed addition of N1‐Ts substituted 1,2,3‐triazoles to olefins. The reac‐tions of monosubstituted and unsubstituted triazole substrates with various olefins, including vinyl esters, are explored.

Effect of Aminoaromatic Acids as Additives on the Activity and Selectivity of the Platinum-catalyzed Hydrosilylation of Alkenes

A series of aromatic acids has been tested as additives for the platinum-catalyzed hydrosilylation of styrene with triethoxysilane. Both excellent conversion of styrene and selectivity in favor of the ,β-adduct were achieved using aminobenzoic acids as additive. Moreover, the use of 4-aminobenzoic acid led to significantly superior enhancement in both catalytic activity and selectivity among the tested aminobenzoic acids. Indeed, 100% conversion of styrene and 98.4% selectivity in favor of the β-adduct were obtained. Additionally, hydrosilylations of various alkenes with a variety of platinum catalysts have also been tested, and in each case the conversion of substrate and the selectivity of the β-adduct were promoted by using 4-aminobenzoic acid as additive.

Synthesis, characterization of triphenyltin grafted on SBA-15mesoporous silica and its catalytic performance for the synthesis of 4-methylacetophenone

The production of Ph3Sn–O–SBA-15(Ph3Sn SBA)was achieved by heating triphenyltin chloride and SBA-15in N-methylpyrrolidone at 190°C for 5 h using triethylamine as a catalyst.The composition,structure,and surface physical and chemical properties of Ph3Sn SBA were characterized using inductively coupled plasma-atomic emission spectroscopy(ICP-AES),13C,119Sn and29Si solid-state nuclear magnetic resonance(NMR)spectroscopy in situ pyridine infrared spectroscopy(Py-IR),N2adsorption–desorption isotherms,X-ray diffraction(XRD)and transmission electron microscopy(TEM).The results of ICP-AES and organic elemental analysis showed that the grafting yield of Sn was 17%(by mass)for Ph3Sn SBA.The elemental analysis and solid-state NMR results for Ph3Sn SBA were consistent with grafting of triphenyltin on SBA-15.The N2adsorption–desorption,XRD and TEM analyses showed that Ph3Sn SBA retained an ordered hexagonal mesoporous structure,resulting in decreases in the surface area,pore size and mesopore volume,and an increase in acidity as compared with SBA-15.The Hammett acidity function(H0)value and the number of acid sites for Ph3Sn SBA,obtained by the Hammett methods,were 2.77–3.30 and 2.07 mmol·g-1,respectively.The Friedel–Crafts acylation of toluene and acetic anhydride over Ph3Sn SBA was investigated.The yield of methylacetophenone(MAP)and the selectivity for 4-methylacetophenone(PMAP)were 79.56%and 97.12%,respectively,when the conditions were n(toluene):n(anhydride)=2.0:1.0 with 6%(by mass)catalyst,and heating under reflux for 5 h.The PMAP selectivity still reached 93.11%when Ph3Sn SBA was used for the fifth time under the same reaction conditions.

In-situ Enhanced Toughening of Poly（ethylene terephthalate）/elastomer Blends via Gamma-Ray Radiation at Presence of Trimethylolpropane Triacrylate

Gamma-ray radiation has always been a convenient and effective way to modify the inter- facial properties in polymer blends. In this work, a small amount of trimethylolpropane triacrylate （TMPTA） was incorporated into poly（ethylene terephthalate） （PET）/random terpolymer elastomer （ST2000） blends by melt-blending. The existence of TMPTA would induce the crosslinking of PET and ST2000 molecular chains at high temperatures of blend- ing, resulting in the improvement in the impact strength but the loss in the tensile strength. When the PET/ST2000 blends were irradiated by gamma-ray radiation, the integrated me- chanical properties could be enhanced significantly at a high absorbed dose. The irradiated sample at a dose of 100 kGy even couldn＇t be broken under the impact test load, and at the same time, has nearly no loss of tensile strength. Based on the analysis of the impact- fractured surface morphologies of the blends, it can be concluded that gamma-ray radiation at high absorbed dose can further in situ enhance the interfacial adhesion by promoting the crosslinking reactions of TMPTA and polymer chains. As a result, the toughness and strength of PET/ST2000 blend could be dramatically improved. This work provides a facial and practical way to the fabrication of polymer blends with high toughness and strength.

Red-emission organic light-emitting diodes based on solution-processable molecules with triphenylamine core and benzothiadiazole-thiophene arms

We report red-emission organic light-emitting diodes (OLEDs) based on solution-processable organic molecules with triphenylamine (TPA) as core and benzothiadiazole-(4-hexyl)thiophene (BT-4HT) as arms.Bi-armed molecule B(TPA-BT-4HT) and star-shaped (tri-armed) molecule S(TPA-BT-4HT) both show pure red-emission peaked at 646 and 657 nm,respectively.The red-emission OLED with S(TPA-BT-4HT) as the emitting layer displays a higher maximum luminance of ca.7794 cd/m2 and a maximum EL efficiency of 0.91 cd/A.