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941.
GAO Hong-Xu ZHAO Feng-Qi HU Rong-Zu ZHANG Hai DONG Hai-Shan YAO Pu XU Zhou HU Gang 《中国化学》2008,26(11):1973-1978
The thermal behaviour and decomposition reaction kinetics of benzotrifuroxan (BTF) were determined by TG and DSC techniques. The kinetic parameters of the exothermic decomposition reaction in a temperature programmed mode (the apparent activation energy Ea and pre-exponential factor A) were calculated by a single non-isothermal DSC curve. The E values calculated using the Kissinger and Flynn-Wall-Ozawa equations and integral isoconversional non-linear equations were used to check the validity of activation energy by a single non-isothermal DSC curve. The results show that the kinetic model function in integral form and the values of Ea and A of the decomposition reaction of BTFare , 109.95 kJ•mol-1 and 108.16 s-1, respectively. The values of ∆S≠, ∆H≠ and ∆G≠ of this reaction are -93.15 J•mol-1•K-1, 150.72 kJ•mol-1 and 153.15 kJ•mol-1, respectively. The critical temperature of thermal explosion of BTF is 257.33 ℃. 相似文献
942.
本文建立了一种快速的微薄辅助萃取-高效液相色谱法分离检测羊肝、牛肉和牛奶样品中三种喹诺酮类药物(氟罗沙星、洛美沙星和斯帕沙星)和两种非甾类化合物(酮洛芬和布洛芬)的方法。并对微波辅助萃取条件利用正交试验进行了优化:萃取温度为4℃、萃取时间为6min、萃取溶剂为乙腈、萃取溶剂体积为10mL。在浓度范围为0.25—0.75 μg•g-1时各待测物的三种不同水平的添加回收率在60.0%到107%之间,并获得较好的精确度(RSD<11%)。 相似文献
943.
本实验合成了一种以聚乙烯基酯树脂为原料的聚合物整体柱。在聚合反应中,聚乙烯基酯树脂在聚合中既作为单体同时也作为交联剂,偶氮二异丁腈作为引发剂,十六醇为致孔剂。聚合物制得后以扫描电镜考察了该聚合物的内部形态。同时联合高效液相色谱分别考察了该整体柱的分离能力和载样量。在分离实验中,考察了流动相的浓度及pH值对分离效果的影响。结果表明,溶菌酶可成功的从鸡卵清中分离出,并在较短的时间内取得了较好的分离效果。 相似文献
944.
Hai Fang Zhang Zi Feng Li Gang Li Li Peng Wang Jia Bin Li Guang Jian Mei 《中国化学快报》2008,19(12):1499-1503
Reaction of Zn(NO3)2·6H2O with 3-(4-carboxylphenylamino)-l-ferrocenyl-2-butylen-l-one (HL) and 4,4′-bipyfidine (4,4′- bipy) in methanol solution resulted in a novel ladder-like coordination polymer {[Zn2L2(μ2-L)2(4,4′-bipy)2]·MeOH}n (1). Its crystal structure, thermal and electrochemical properties are presented. 相似文献
945.
α-{ 3-[2-hydroxy-3-(N-methyl-N-hydroxyethylamino)propoxy]propyl }-α-butylpolydimethylsiloxanes III with various molecu- lar weights were prepared by epoxy addition of α-[3-(2,3-epoxy-propoxy)propyl]-α-butylpolydimethylsiloxanes Ⅱ and N- methylmonoethanolamine. At each step, the outcome compounds were characterized through FT-IR and NMR spectra, the results showed that each step was successfully carried out and objective products were achieved. 相似文献
946.
溴化(a-噻吩甲酰基)甲基三苯鉮1与3-取代苯甲叉基-2,4-戊二酮 2以碳酸钾为碱,在苯中55℃条件下反应,可以较好的收率、高立体选择性地生成反-2-(a-噻吩甲酰基)-3-取代苯基-4-乙氧羰基-5-甲基-2,3-二氢呋喃3。产物结构均经波谱予以确定。本文还提出了生成产物的可能机理。 相似文献
947.
Yi Tao Yu Qing Si Zhang Meng Zhang Hai Feng Sun 《中国化学快报》2008,19(1):47-50
A series of α-N,N-dihydroxyethylaminopropyl-ω-butylpolydimethylsiloxanes with different molecular weight were synthesized. The preparation included five steps which were hydroxyl protection, alkylation, anionic ring-opening polymerization, hydrosilylation and deprotection. The structure of reaction products was characterized by FT-IR, GC, 1H NMR. 2007 Qing Si Zhang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved. 相似文献
948.
Jin Yang Chen~ 《中国化学快报》2008,19(4):475-478
Under high pressures of several giga-pascals using hydrothermal diamond anvil cell,methane generated directly from CaCO3 reduction in gold-lined chamber is in situ measured by Raman spectroscopy at the temperature of 550℃ Fhe reducing agents include FeO,SiO and natural fayalite(Fe2SiO4),and the resource of hydrogen are water and natural serpentine(Mg3Si2O5(OH)4). The study demonstrates the existence of abiogenic formation of methane under high pressures in the Earth's interior and that the application of high pressure to catalyze multicomponent reactions is a very promising method. 相似文献
949.
950.
The luminescence from Eu(2+) ions in MF2 (M = Ca, Sr, Ba) fluorides has been investigated under the pressure range of 0-8 GPa. The emission band originating from the 4f(6)5d(1) --> 4f(7) transition of Eu(2+) ions in CaF2 and SrF2 shows the red-shift as increasing pressure with pressure coefficients of -17 meV/GPa for CaF2 and -18 meV/GPa for SrF2. At atmospheric pressure, the emission spectrum of BaF2:Eu(2+) comprises two peaks at 2.20 and 2.75 eV from the impurity trapped exciton (ITE) and the self-trapped exciton (STE), respectively. As the pressure is increased, both emission peaks shift to higher energies, and the shifting rate is slowed by the phase transition from the cubic to orthorhombic phase at 4 GPa. Due to the phase transition at 4-5 GPa pressure, the ITE emission disappears gradually, and the STE emission is gradually replaced by the 4f(6)5d(1) --> 4f(7) transition of Eu(2+). Above 5 GPa, the pressure behavior of the 4f(6)5d(1) --> 4f(7) transition of Eu(2+) in BaF2:Eu(2+) is the same as the normal emission of Eu(2+) in CaF2 and SrF2 phosphors. 相似文献