3-丙烯酰氧甲基-和3-[2-甲氧基(三乙氧基)]甲基-3′-甲基氧杂环丁烷共聚物的合成及导电性能

通过阳离子开环聚合制备了一系列不同比例的3-丙烯酰氧甲基-3'-甲基氧杂环丁烷(AMO)和3-[2-甲氧基(三乙氧基)]甲基-3'-甲基氧杂环丁烷(MEMO)的共聚物PAM. 通过1H-NMR谱图计算发现:AMO结构单元在共聚物中所占的比例均低于根据投料比计算的理论值. 把这些共聚物和LiTFSI复配后通过BPO引发自由基聚合可交联成膜,利用交流阻抗法测试了其离子电导率,其中MEMO含量最高的PAM33电导率最高,30℃时达1.44×10-5S/cm ,80℃时达1.25×10-4S/cm. DSC测试结果显示,共聚物中MEMO的结构单元含量越多,其Tg越低,越有利于导电.     

聚苯乙烯微球制备过程中界面张力的影响因素

系统考察了聚苯乙烯(PS)微球制备过程中十二烷基硫酸钠浓度、离子强度对于界面张力的影响.研究结果表明,十二烷基硫酸钠水溶液与苯乙烯的界面张力随十二烷基硫酸钠浓度的增加,先降低再升高,然后趋于平衡.离子强度与苯乙烯/H2O界面张力之间也存在同样的变化关系.根据离子强度对乳液的影响,选择了最佳的离子浓度,采用膜二次射流法制备乳液,然后将乳液加热聚合制备出大小均一的PS微球,粒径约为200 nm.     

超声浴回流法制取哌啶类离子液体

离子液体由于具有电导率高、低蒸汽压、宽电化学窗口、对环境友好等特点，已应用于锂离子电池电解液．采用超声浴回流方法制取高纯度哌啶类离子液体，在电池体系Li／LiTFSI的PP13／14TFSI溶液/LiCoO2中，0．1C充放时获得超过139mAh／g的释放比容量．并用核磁共振（NMR）技术对产物结构进行表征，同时就该制取法对产物纯度提高、缩短制备周期和节约成本等特点进行了探讨．     

Mechanism of selective separation on the surface of ionic sieve of removal of lead

This note describes a kind of ionic sieve with high selectivity to remove trace lead in water, in which stannic molybdopyrophosphate is used to be the substrate. The mechanism of selective separation on the surface of ionic sieve of removal of lead was explored by analyzing fourier transformation infrared spectra (FTIR), X-ray photoelectron spectrometry (XPS) and the results of selective adsorptivity experiment. The investigation suggests that in the process of synthesizing ionic sieve the olation reactions occur in solid phase by thermodynamic recrystallization and the adsorption units with special selectivity to lead are formed by chemical modification. After the ion exchange for Pb²⁺, the oaltion reactions not only keep the microstructures of adsorption units from collapse, but also provide lead cavties with special selectivity to lead ion that are capable of having special binding “memory effect” to Pb²⁺ by SnO₃ ²⁻ and P₂O₇ ⁴⁻ groups on the surface of this ionic sieve. Meanwhile, the selective separation capacity is a kind of weak chemical effect that is relative to the valence electron state of the adsorbed ion directly and tightly.     

室温离子液体及其在绿色化学中的应用

~~烷基取代咪唑阳离子 (图 1 )研究最多 ,表 1总结了近年来开发研究的此类阳离子的种类及结构 .可以组成室温离子液体的阴离子 ,目前的研究除 Al Cl4-,NO2 -和干燥时易爆的 NO3 -,Cl O4-外 ,含氟阴离子为多 ,主要有 :BF4-,PF6-,As F6-,Sb F6-,F ( HF ) n-,CF3 SO3 -,CF3 CF2 CF2 CF2 SO3 -,( CF3 SO2 ) 2 N-,( CF3 SO2 ) 3 C-,CF3 COO-,CF3 CF2 CF2 COO-等 .图 1　烷基取代咪唑阳离子　　由各种阳离子和各种阴离子组合 ,可以得到一系列特性各异的室温离子液体 ,目前已报道的多为由表 1所示的烷基咪唑阳离子和含氟阴…     

Fe（dipy）2（CN）2的溶剂色性研究

研究了Ｆｅ（ｄｉｐｙ）２（ＣＮ）２配合物的溶剂色性，从成键情况分析了产生溶剂色性的原因，溶剂的极性参数ＡＮ可用来阐明该本系的溶质－溶剂相互作用而导致ＣＴ吸收带位移的现象。     

细粒浮选体系中界面极性相互作用理论及应用

本文系统讨论了界面极性相互作用理论及其在细粒浮选研究中的应用。亲水矿粒间水化排斥作用及疏水矿粒间疏水吸引作用主要归因于颗粒间界面极性相互作用。通过测定矿物在已知表面能参数的液体中的接触角,就可确定矿物的表面能参数值。由界面极性相互作用能确定水化或疏水相互作用能量常数,从而计算颗粒间水化或疏水相互作用能曲线,利用EDLVO理论能很好解释矿粒间的凝聚、分散行为。     

Respective roles of short-and long-range interactions in protein folding

A new method was presented to discuss the respective roles of short- and long-range interactions in protein folding. It‘s based on an off-lattice model, which is also being called as toy model. Simulated annealing algorithm was used to search its native conformation. When it is applied to analysis proteins lagt and laho, we find that helical segment catmot fold into native conformation without the influence of long-range interactions. That‘s to say that long-range interactions are the main determinants in protein folding.     

Synthesis and crystal structure of tetranuclear zinc benzoate

A tetranuclear zinc benzoate Zr4O(C6H5CO2)6 was synthesized and characterized by X-ray single crystal determination. It crystallizes in cubic, space group Ia-3d. Its crystal cell is very large, α=4.10063(18)nm, V=68.953(5)nm^3 and Z=48. The structure is composed of discrete Zr4O(C6H5CO2)6 molecules. In each molecule, four zinc atoms are held together by a central oxygen atom, which results in the formation of a regular tetrahedron. All benzoate ligands coordinate to zinc atoms in a bidentate bridging mode. Each zinc atom is in a slightly distorted tetrahedral geometry, coordinated by three benzoate oxygen atoms and the central oxygen atom. The intermolecular interactions result in the formation of a three-dimensional supramolecular framework, with non-intersecting parallel channels.     

Kovar与K4玻璃阳极焊接机理及影响因素

分析了Kovar合金与K4玻璃阳极焊的结合机理和主要工艺参数对连接过程的影响,提出了金属与玻璃的连接机理为电场和温度场作用下的离子迁移、复合氧化物过渡层的生成和沉积,电压、温度、压力及试样表面质量是影响离子迁移和结合的主要因素,相匹配的热膨胀系数是防止开裂保证良好连接的必要条件。