SYNTHESIS OF AN AMPHIPHILIC PPESK-g-P(PEGMA) GRAFT COPOLYMER VIA ATRP AND ITS USE IN BLEND MODIFICATION OF PPESK MEMBRANES

Preparation of an amphiphilic graft copolymer having poly(phthalazinone ether sulfone ketone)(PPESK) as main chains was carried out by atom transfer radical polymerization(ATRP).The precursor,chloromethylated PPESK (CMPPESK),was prepared by using chioromethylether as chloromethylation agent.Then,poly(ethylene glycol) methyl ether methacrylate(PEGMA) was used as monomer to synthesize PPESK-g-P(PEGMA) by ATRP method under the catalysis of a cuprous chloride/2,2'-bipyridyl system.PPESK/PPESK-g-P(PEGMA) blen...     

巯基偶氮苯单分子电子传输的取代基效应

用密度泛函理论B3LYP/6-31G**计算巯基偶氮苯分子及分子离子的空间构型和电子结构, 研究取代基对巯基偶氮苯单分子电子传输的影响. 结果表明, 拉电子基(—COOH、—NO2)的引入, 可以提高巯基偶氮苯单分子电子传输体系的稳定性, 使体系LUMO的离域性增高、S原子反应活性增强、HOMO-LUMO能隙显著减小, 进而降低电子传输能垒, 有利于分子电子传输. 相同取代基的分子离子比分子具有更小的HOMO-LUMO能隙, S—Au键更易形成, 金属-分子-金属结构的电子传输性更强.     

一种新络合盐晶体——K3[InCl6]的合成

在采用本实验室提出的络盐法制备氧化铟锡(Indium-tin-oxide,简称ITO)纳米粉末的试验过程中发现和制备了一种新络合盐晶体--K3[InCl6].通过XRD、SEM和CCD等测试手段对其物相、形貌、元素成份和结构进行了表征.结果表明:该晶体属单斜晶系,空间群为P21/c,分子式为K3[InCl6],Z=4,其晶胞参数为:a=1.2188nm,b=0.7553nm,c=1.2703nm,α=90.00°,β=108.96°,γ= 90.00°,V=110.598nm3.     

氩气等离子体聚合大豆油的合成及摩擦学性能研究

利用氩气等离子体降低大豆油(SO)中不饱和C=C双键的含量,得到高黏度的聚合油PAR2.采用凝胶渗透色谱仪分析了PAR2的分子量分布;采用四球摩擦磨损试验机考察了PAR2及同黏度级别的光亮油175BS的摩擦学性能;采用X射线光电子能谱仪分析了钢球摩擦表面元素的化学成分及状态.结果表明:氩气等离子体处理使得PAR2在40℃下的黏度由33.8 cSt增加到956 cSt;与175BS相比,PAR2表现出更为优良的黏温及低温流动性能.与此同时,PAR2中的聚合物主要由SO的二聚物及高分子量的齐聚物组成,其数均分子量M n分别达到2 735和5 434.此外,PAR2的承载能力以及减摩抗磨性能优于175BS;这是由于PAR2在金属表面形成的由羧酸铁组成的边界润滑膜与高价氧化铁膜共同作用,从而有效地减轻金属表面的摩擦与磨损所致.     

一种多吡啶双核单功能铂配合物的合成、晶体结构及抗癌活性

合成了一种含有多吡啶基配体2,6-双((双(吡啶-2-基甲基)氨基)甲基)吡啶(BPA-TPA)的双核单功能铂(Ⅱ)配合物[Pt₂(BPA-TPA)Cl₂]Cl₂(Pt₂-BPA-TPA),以核磁共振波谱和高分辨质谱进行表征,并通过X射线单晶衍射确定了Pt₂-BPA-TPA的结构。琼脂凝胶电泳实验表明 Pt₂-BPA-TPA 在 10 μmol·L-1的低浓度下可有效切割 pBR322 DNA。通过 CCK-8(cell counting kit-8)实验检测了Pt₂-BPA-TPA 对人肺癌细胞系A549的细胞毒性,结果显示Pt₂-BPA-TPA 表现出比顺铂更好的抗癌活性,其主要通过触发DNA损伤和上调下游凋亡相关细胞信号通路蛋白(p21蛋白和cleaved-caspase-3)诱导细胞凋亡。     

导热橡胶研究进展

橡胶是热的不良导体,但在实际应用中,许多领域需要橡胶具备一定的导热性能,以满足使用要求。因此,人们对于橡胶导热的研究越来越重视。本文概述了导热填料种类、形状、粒径、界面结合状态以及填料在橡胶基体中的分散性等因素对橡胶复合材料导热性能的影响,从实验角度分析了填充型导热橡胶的导热机理,阐述了目前研究中人们所建立的各种物理和数学模型,浅析了这些模型的优缺点及适用范围,并将其应用于橡胶材料导热性能的预测,最后介绍了导热橡胶的应用领域,以及导热橡胶未来的发展方向。     

SEGREGATED VECTOR SOLUTIONS FOR NONLINEAR SCHR?DINGER SYSTEMS IN R~2

We study the following nonlinear Schrodinger system where P(τ) and Q(τ) are positive radial functions,μ 0,v 0,and β∈ R is a coupling constant.This type of system arises,particularly,in models in Bose-Einstein condensates theory.Applying a finite reduction method,we construct an unbounded sequence of nonradial positive vector solutions of segregated type when β is in some suitable interval,which gives an answer to an interesting problem raised by Peng and Wang in Remark 4.1(Arch.Ration.Mech.Anal.,208(2013),305-339).     

Two-dimensional non-spatial filtering based on holographic Bragg gratings

The filter made up of two gratings performs as a two-dimensional non-spatial filtering. This paper reports that the volume Bragg gratings are fabricated by interfering two collimated coherent laser beams in photopolymer. Diffraction efficiency of a single grating is up to 78% in Bragg's condition, then a two-dimensional non-spatial filter, which consists of two volume Bragg gratings and a half-wave plate, enables the laser beam filtered in two dimensions with the diffraction efficiency of 54%. The Bragg's condition and effect of polarisation on performances of the two-dimension filter are also discussed.     

象面全息无损检测的实验研究

本文对象面全息无损检测方法进行了实验研究,结果表明该方法可用白光再现;同时,对于小缺陷可进行放大成象,从而提高了对小缺陷的判别精度。