醋酸乙烯酯-马来酸酐共聚物与水解聚丙烯酰胺高分子络合物的研究

<正> 某些高分子在溶液中可以通过次价力形成高分子络合物.根据次价力的不同,可分为四类:聚电解质络合物、氢键络合物、立体络合物和电荷转移络合物.部分水解聚丙烯酰胺(简称HPAM)是在水悬浮体中被广泛使用的絮凝剂,醋酸乙烯酯-马来酸酐共聚物(简称VAMA)是一种能力很强的泥浆稀释剂.研究二者在水溶液中的相互作用,在理论上和应用上都有重要意义.我们曾研究了粘土对它们的吸附作用、改变泥浆流变性以     

电化学方法对两性接枝星形聚合物LB膜屏蔽效应的研究

本文将自制Y式玻碳电极拉上两性接枝星形聚合物(GPSMA)的LB膜,用循环伏安法研究谈膜的屏蔽效应,讨论了接枝量、成膜条件等对膜缺陷的影响,并提出了减少缺陷的办法。     

互通多孔碳/二氧化锰纳米复合材料的原位水热合成及电化学性能

以互通多孔碳（IPC）为载体，水热条件下在碳表面原位反应生成纳米结构的二氧化锰（MnO₂），制备互通多孔碳/二氧化锰纳米（IPC/MnO₂）复合电极材料. 采用扫描电镜（SEM），透射电镜（TEM），X射线衍射（XRD），热重分析（TGA）对其结构进行表征；采用循环伏安法、恒流充放电和交流阻抗对其电化学性能进行研究. 结果表明：生成的MnO₂均匀地负载在碳的表面，形成多层次结构，并且随着温度的升高IPC表面负载的MnO₂由纳米颗粒变为纳米片状结构；MnO₂纳米片具有典型的K-Birnessite 型晶体结构；复合物中MnO₂的含量约为34%（w）. 在100 ℃制备的IPC/MnO₂复合材料在三电极系统中最高比电容达到了411 F·g^-1；随着反应温度的升高,比容量先增长后基本保持不变. 以IPC/MnO₂为正极，活性炭（AC）为负极，1 mol·L^-1 Na₂SO₄溶液为电解液组装成IPC/MnO₂//AC 混合超级电容器，发现IPC/MnO₂电极的电容器其电位窗口从1 V扩展到1.8 V，容量可达86F·g^-1，且表现出良好的电容特性和大电流放电性能.     

Ce4＋－Ce3＋循环体系引发淀粉与丙烯酰胺接枝共聚合反应动力学研究

The cyclic initiating system of Ce⁴⁺ - Ce³⁺ - Ce⁴⁺, in which the product of reduced ion Ce³⁺ forming from Ce⁴⁺ after initation being oxidized again to the original oxidizing ion Ce⁴⁺ is examined. The characters of process of the graft copolymerisation using the cyclic initiating system is compared with the ones using ceric and persulphate individually. When using the cyclic systerm as initator, it was more effective to graft polymerise acylamide onto starch and a rather high proportion of graft copolymer was made as opposed to using persulphate individually.     

磁化作用对汽油动态挥发性影响的研究

用热重（TG）分析和自行设计的原位动态挥发实验，研究了在不同条件下汽油的挥发性，结果表明，磁化空气或磁化汽油都可提高汽油的挥发性，而汽油和空气共同磁化，可更大幅度地提高汽油的挥发性。     

水相法合成二氯二甲茂钛与水杨酸类配合物

Ｃｐ2 ＴｉＣｌ2 具有很好的抗癌活性 ,已成为第三代抗癌药物[1 - 3] 。为了寻求活性更高的抗癌药物 ,探索抗癌机理 ,我们用 (ＭｅＣｐ) 2 ＴｉＣｌ2 、水杨酸或其衍生物 ,按水相法合成了甲茂钛的水杨酸类配合物。合成路线如下图所示 :其中 :Ⅰ为ｐＨ <4 ,Ｘ =Ｈ ,Ｙ =Ｈ的产物 ;Ⅱ为ｐＨ <4 ,Ｘ =Ｈ ,Ｙ =ＮＯ2 的产物 ;Ⅲ为ｐＨ >6 ,Ｘ =ＮＯ2 ,Ｙ =ＮＯ2 ,Ｚ =Ｏ的产物 ;Ⅳ为ｐＨ >6 ,Ｘ =Ｈ ,Ｙ =Ｈ ,Ｚ =Ｓ的产物。 (Ⅰ～Ⅳ为新化合物 )1　实验部分1 .1　仪器与试剂水杨酸、ＴｉＣｌ4,ＡＲ ;5 -硝基水杨酸、3,5 -二硝基水杨酸、5 -磺基…     

Coating Carbon Nanotubes with Europium Oxide

Carbon nanotubes (CNTS) coating with europium oxide by a simple method is reported in this letter for the first time. The CNTS were refluxed in a solution of nitric acid containing europium nitrate, and the pH value was subsequently ajusted with ammonia solution. At last, the mixture was filtered and annealed. The TEM micrograph showed that the CNTS were covered with a uniform thin layer with thickness of about 15 nm. The XRD results revealed that the CNTS were coated with europium oxide.     

一种制备大量氧化锌纳米管的简单方法(英)

ZnO nanotubes were synthesized in large scale by thermal decomposition of the precursors obtained via chemical reaction between Zn(CH₃COO)₂·2H₂O and NaHCO₃ in the presence of surfactant sodium dodecyl sulfate (SDS). The inner diameters of the tubes were in the range of 80～100 nm, and outer diameters in the range of 160～260 nm with lengths up to a few micrometers. The products were characterized with XRD, TEM, and SEM.     

奥利司他的全合成研究进展

综述了减肥药物奥利司他的全合成的研究进展. 根据合成策略上的不同, 将全合成研究分三部分进行了概述.     

Synthesis and Characterization of Novel Polyimides Based on Pyridine-containing Diamine

A new aromatic diamine monomer containing pyridine unit, 2,6-bis （4-aminophenoxy- 4＇-benzoyl）pyridine（BABP）, was synthesized in three steps, starting from 2,6-pyridinedicarboxyl chloride. A series of novel pyridine-containing polyimides were prepared v/a the polycondensation of BABP with various aromatic dianhydrides through poly（amic acid） precursors, and thermal or chemical imidization of the precursors. The polyimides exhibit desirable properties, e.g., good solubility in N-methyl-2-pyrrolidone and m-cresol, excellent thermal stability and film-forming capability, as well as high inherent viscosity, indicating high molecular weight.