马来化桐油与环氧类化合物的聚合反应

研究了马来化桐油和马来化桐酸甲酯与环氧氯丙烷和环氧丙烷的聚合反应.通过不同条件下的实验,证实在叔胺催化下反应为交替共聚,得到聚酪,并利用 IR,UV 和元素分析等手段确认了聚合物的结构.还讨论了反应物的配比,催化剂种类和用量,反应时间、反应温度及羟基化合物等因素对聚合反应的影响,为马来化桐油的开发和利用提供了理论依据.     

甲氧基乙醇红外多光子解离机理的研究

用TEA CO_2激光器研究了甲氧基乙醇(CH_3OCH_2CH_2OH)的红外多光子解离机理.探讨了解离机理与分子的电荷分布和断裂键的势能曲线之间的关系.测得了解离率与激光能流的关系,得到解离阈值约为0.9J/cm~2.     

Solid–liquid equilibrium and hydrogen solubility of trans-decahydronaphthalene + naphthalene and cis-decahydronaphthalene + naphthalene for a new hydrogen storage medium in fuel cell system

Solid–liquid equilibrium was measured for benzene + cyclohexane, trans-decahydronaphthalene + naphthalene and cis-decahydronaphthalene + naphthalene under the atmospheric pressure in the temperature range from 226.69 to 353.14 K. The apparatus was specially designed in this study, and it was based on a cooling method. The phase diagram with the complete immiscible solids was observed for the three systems, and the eutectic point was found at x₂ = 0.2709 and T_eu = 232.11 K for benzene + cyclohexane, x₂ = 0.9816 and T_eu = 241.98 K for trans-decahydronaphthalene + naphthalene, and x₃ = 0.9822 and T_eu = 225.74 K for cis-decahydronaphthalene + naphthalene, respectively. Hydrogen solubility was also measured for the two pure substances, trans-decahydronaphthalene and cis-decahydronaphthalene, and the three mixtures, trans-decahydronaphthalene + cis-decahydronaphthalene, trans-decahydronaphthalene + naphthalene, and cis-decahydronaphthalene + naphthalene, in the pressure range from 1.702 to 4.473 MPa at 303.15 K. Considering the solid–liquid equilibrium data, mole ratio of trans-decahydronaphthalene:cis-decahydronaphthalene was set to 50:50, and those of trans-decahydronaphthalene + naphthalene, and cis-decahydronaphthalene + naphthalene to 85:15. The hydrogen solubility increased linearly with the pressure following the Henry's law for all systems. The experimental solubility data were correlated or predicted with the Peng–Robinson equation of state [D.Y. Peng, D.B. Robinson, Ind. Eng. Chem. Fundam. 15 (1976) 59–64; R. Stryjek, J.H. Vera, Can. J. Chem. Eng. 64 (1986) 323–333].     

醇溶性聚丙烯酸酯乳液的合成及性能研究

以丙烯酸乙酯(EA)、甲基丙烯酸甲酯(MMA)和甲基丙烯酸(MAA)为主单体,采用过硫酸盐作引发剂,经预乳化乳液聚合工艺合成了聚丙烯酸酯乳液.讨论了乳化剂种类、单体种类以及功能性单体、引发剂加入工艺对乳液聚合过程及乳液产品性能的影响.结果表明:单体组成为m(MMA)∶m(EA)∶m(MAA)=45∶40∶15所得乳液聚合物能满足使用性能要求;种子引发剂加入质量控制在单体总质量的0.3%,而总的引发剂用量占单体总质量的0.8%较适宜.用差热分析仪和凝胶渗透色谱仪对乳液聚合物进行了表征.     

Bonding and Mssbauer Isomer Shifts in(Tl,Pb)-1223 Cuprate

The third member of the homologous series of TlBa2Can-1CunO2n+3 (Tl-1223) was reported to be a superconductor at a transition temperature of 118 K1. The Tl-1223 compound is known as a suitable material for practical applications because it has high Tc and Jc values. The small spacing between the CuO2 planes in Tl-1223 can avoid a large anisotropy in the superconducting properties, which makes it the most attractive. The direct information on the Cu ion site at the atomic level is impo…     

2—乙烯吡啶—丁烯酮共聚物及其羰基铑配合物的XPS研究

本文用X-射线光电子能谱(XPS)研究了2-乙烯吡啶-丁烯酮共聚物及其与四羰基二氯二铑形成的配合物的结构特征.由反映在共聚物Cls光电子伴峰和(?)基Cls峰的消失,以及共聚物Nls和Ols结合能在配合物中的降低,即从施受两方面确证N→Rh和O→Rh配位键的形成.对催化性能的探讨表明,丁烯酮含量的增加导致催化活性的升高,这是由于O→Rh配位键比例的增加和键强较弱所致     

Static adsorptive coating of poly(methyl methacrylate) microfluidic chips for extended usage in DNA separations

A simple and robust static adsorptive (dynamic) coating process using 2% hydroxyethylcellulose was developed for surface modification of poly(methyl methacrylate) (PMMA) microfluidic chips for DNA separations, suitable for usage over extended periods, involving hundreds of runs. The coating medium was also used as a sieving matrix for the DNA separations following the coating process. Four consecutive static treatments, by simply filling the PMMA chip channels with sieving matrix once every day, were required for obtaining a stable coating and optimum performance. The performance of the coated chips at different phases of the coating process was studied by consecutive gel electrophoretic separations with LIF detection using a PhiX-174/HaeIII DNA digest sample. The coated chip, with daily renewal of the sieving matrix, showed high stability in performance during a 25-day period of systematic study, involving more than 100 individual runs. The performance of the coated chip also remained almost the same after 3 months of continuous usage, during which over 200 separations were performed. The average precision of migration time for the 603-bp fragment was 1.31% RSD (n = 6) during the 25-day study, with a separation efficiency of 6.5 x 10(4) plates (effective separation length 5.4 cm).     

Determination of potassium in fatty acid methyl esters applying an ion-selective potassium electrode

An easy and inexpensive method of potassium determination in fatty acid methyl esters (FAME) applying an ion-selective potassium electrode (ISE-K) is presented. FAME are considered alternative fuel for diesel engines. Simple apparatus and procedure were developed to avoid contact of ester samples with the sensitive ISE-K membrane, which can damage the ISE membrane surface in long time operation. Using different FAME samples with a wide range of known potassium content a calibration curve was constructed. Among all samples, ISE-K satisfactory predicted potassium content in FAME as identified by the AAS reference method.     

胶晶模板法制备3DOM尖晶石型LiMn2O4及表征

通过乳液聚合获得粒径为280 nm左右的聚甲基丙烯酸甲酯(PMMA)微球, 从其母液中离心沉降制得胶晶模板. 将LiNO3, Mn(Ac)2·4H2O和柠檬酸按摩尔比1∶2∶2配成前驱物的醇水混合溶液, 填充于PMMA胶晶模板间隙中, 经干燥和焙烧氧化成孔制得了三维有序大孔(3DOM)锂锰氧化物. 实验结果表明, 当n(Li)/n(Mn)=0.6, 前驱液浓度在0.6~1.0 mol/L之间和升温速率为2 ℃/min时, 分别在300与600 ℃下两段恒温焙烧2~3 h有利于目标产物的形成. SEM测试结果表明, PMMA胶晶模板和3DOM锂锰氧化物均为面心立方紧密堆积, 排列规则有序, 大孔直径在200~240 nm之间, 孔壁厚度在30~45 nm之间. 产物经XRD晶相测定和EDTA, KMnO4滴定分析确证为正尖晶石型LiMn2O4.     

含手性膦配体和邻巯基氧化吡啶配体的金,钯配合物的2D NMR研究

对含手性膦配体甲基-3-脱氧-3－（二苯膦基）－4，6-氧-苄叉基-a-D-吡喃阿卓糖苷（3－MBPA）和甲基-2-脱氧-2－（二苯膦基）－4，6-氧-苄叉基-a－D-吡喃阿卓糖苷（2－MN-PA）及邻巯基氧化吡啶配体mpo的金配合物An[（3－MBPA）（mpo）]（1）、An[（2－MBPA）（mpo）]（2）和钯配合物Pd[（3－MBPA）（mpo）C1]（3）、Pd[（2－MBPA）（mpo）-C1]（4）进行1H和13CNMR谱测定，利用一维和二维NMR技术归属了所有的1H和13CNMR谱线，结果表明：配体MBPA与金属配伍的是P原子，糖苷上H－5的化学位移变化最大，而且与配位金属的种类有关；配体mpo以单齿形式与金属配位时，是S原子参与配位。