氧化铝/碳纳米管复合材料的制备及表征

采用聚乙烯醇对碳纳米管表面进行改性，通过化学沉淀法将Al(OH)₃均匀沉积在碳纳米管表面，然后在氮气气氛下于500 ℃煅烧2 h，制备出氧化铝/碳纳米管复合材料。采用TEM、TG、DTA、XRD、IR、氮吸附脱附(比表面积及孔结构分析)等对氧化铝/碳纳米管复合材料进行表征，结果表明:未经聚乙烯醇改性的碳纳米管，氧化铝与碳纳米管相互分离;经聚乙烯醇改性的碳纳米管，氧化铝与碳纳米管结合良好。经聚乙烯醇改性的碳纳米管表面均匀覆盖一层聚乙烯醇膜，通过聚乙烯醇的吸附作用， Al(OH)₃沉积在碳纳米管表面形成一层连续的覆盖层。     

INFLUENCE OF COMPOSITIONAL HETEROGENEITY ON MORPHOLOGY AND PROPERTIES OF SEGMENTED COPOLYMERS

Polyethylene terephthalate(PET)/polycaprolactone(PCL) segmented copolymers with different hard segment contents and a blend of two of them were studied by using DSC, WAXS, TEM and IR techniques and dynamic mechanical, stress-strain and isothermal crystallization measurements. Emphasis was laid on the studies of influence of compositional heterogeneity on the morphology and properties of these segmented copolymers. It was found that the solution cast specimens of the more heterogeneous sample exhibit better segregation of segments, high crystallinity and melting temperature. They have higher thermal stability of mechanical properties at small deformations. However, they are less stable against large deformations and may become softer than the more homogeneous ones.     

Preparation of Nanoelectrode Ensembles by Assembly of Nano—Silver Colloid on Gold Surface

A novel method for preparing silver nanoelectrode ensembles(SNEEs) and gold nanoelectrode ensembles (GNEEs) has been developed. Silver colloid particles were first absorbed to the gold electrode surface to form a monolayer silver colloid. N-hexadecyl nercaptan was then assembled on the electrode to form a thoil monolayer on which hydrophilic ions cannot be transfered. The SNEEs was prepared by removing thiol from silver colloid surface through applying and AC voltage with increasing frequency at 0.20V(vs.SCE). Finally,GNEEs was obtained by immersing a SNEEs into 6 mol/L HNO3 to remove the silver colloid particles. By comparison with other methods such as template method ect., this method enjoys some advantages of lower resistance, same diameter,easy preparation,controllable size and density.     

丁二烯在氯化稀土-乙醇-烷基铝催化体系中的某些动力学规律 Ⅱ.链转移速度常数的测定及链终止反应机理的探讨

本文测定丁二烯在La、Nd、Sm、Gd、Dy、Ho和Y七种稀土氯化物与两种烷基铝分别所组成的催化剂之烷基铝链转移速度常数k_a,结果表明,不同稀土催化剂k_a的变化趋势与链增长速度常数相似。动力学方法证明钐催化剂失活按双基终止进行。本文对稀土催化剂失活机理作了初步探讨。     

β-内酰胺酶抑制剂--他唑巴坦新的合成方法

他唑巴坦(Tazobactam)是一种新颖的β-内酰胺酶抑制剂，以6-氨基青霉烷酸为原料，以新的酯化、氧化反应制得关键中间体M4，M4与2-羟基苯并噻唑缩合后，经氯代、成环、氧化、水解等反应得他唑巴坦，总产率达17．8％。该路线在酯化反应中产率达100％。用H2O2直接氧化，避免使用易爆氧化剂，使反应条件温和，易于进行工业化生产。     

广西车田红辉沸石对不同离子吸附性的初步研究

研究表明，不同粒度的红辉沸石在不同的温度条件下对K^ 、Na^ 、Ca^2 、Mg^2 、NH4^ 等离子具有不同的吸附容量。在30℃时，8μm的红辉沸石对K^ 、Na^ 、Ca^2 、Mg^2 、NH4^ 的吸附量分别为：10.90mg/g、10.01mg/g、7.64mg/g、5.50mg/g、108.70mmol/100g；45μm的红辉沸石对K^ 、Na^ 、Ca^2 、Mg^2 、NH4^ 的吸附量分别为：10.10mg/g、9.80mg/g、6.90mg/g、5.08mg/g、101.10mmol/100g；246μm的红辉沸石对K^ 、Na^ 、Ca^2 、Mg^2 、NH4^ 的吸附量分别为：2.66mg/g、2.20mg/g、1.86mg/g、1.26mg/g、28.00mmol/100g；在2℃时，8μm的红辉沸石对K^ 、Na^ 、Ca^2 、Mg^2 、NH4^ 的吸附量分别为：10.60mg/g、9.82mg/g、6.90mg/g、5.07mg/g、99.60mmol/100g。在常温25－30℃，湿度82％条件下，246μm、45μm、8μm的红辉沸石含水率为7.06%、7.25%、7.78%。     

α-杂环硫代苯乙酮衍生物的合成

以5-氨基-3-巯基-(1H）-1，2，4-三唑和2-巯基苯并噻唑为主要原料在碱性条件下与α-氯代苯乙酮反应合成了10个新的标题化合物。其结构经元素分析、IR，^1H NMR和MS确证。     

聚丙烯中空纤维膜的微孔结构的控制

通过熔纺／冷拉伸法制备了微孔聚丙烯中空纤维膜。研究了工艺条件对微孔聚丙烯中空纤维膜的微孔结构与性能的影响。结果表明：随着纺丝温度的下降或熔体拉伸比的提高，最大可几孔径及孔隙率增大；熔纺中冷却风速提高，最大可几孔径及孔隙率较大；温度低于110℃时，热处理对最大可几孔径及孔隙率的影响较小，在120－130℃时，随着热处理温度的增加，最大孔径及孔隙率有明显增加的趋势；随着初纺中空纤维拉伸倍数的增加，孔隙率先增加而后下降。     

纤维声速仪的简化

测定纤维中分子键取向度的声速仪见前文。作者等鉴于仪器将会得到更广泛的应用,特将声速仪中的直流电源、脉冲讯号发生器及多谐振蕩器与放大器等三件仪器簡化;針对它們的基本原理設計一台声波触发器取而代之。     

A Highly Sensitive Spectrophotometric Assay of Bleomycins Based on the Fading Reaction of Some Halofluorescein Dyes

In weak acidic medium, anticancer antibiotics bleomycin A5 （BLMA5） and bleomycin A2 （BLMA2） can react with halofluorescein dyes such as erythrosin （Ery）, eosin Y （EY）, eosin B （EB） and rose bengal （RB） by virtue of electrostatic attraction and hydrophobic force to form the ion-association complexes, which can result in the fading reactions of four halofluorescein dyes. The maximum fading wavelengths of these four dyes were located at 527 nm for Ery, 515 nm for EY, 517 nm for EB and 546 nm for RB, respectively. The decrements of absorbance （AA） were directly proportional to the concentrations of bleomycin in a certain range. A new method for the determination of bleomycins anticancer drugs based on fading reactions of halofluorescein dyes has been developed. The method was not only highly sensitive but also simple and rapid. The molar absorptivities （ε） ranged from 1.5 × 10^5 to 7.5 × 10^5 L·mol^-1·cm^-1. It was applied to determination of the bleomycins in human serum, urine and rabbit serum samples. In this work, the spectral properties and the optimum reaction conditions were investigated. The structure of ion-association complexes and the reaction mechanism were discussed.