砂子负载纳米TiO2薄膜光降解有机污染物的研究

从光化学的角度，对砂子负载纳米二氧化钛薄膜，光催化剂降解工业污水中的有机污染物的过程进行分析与研究，探讨了多种因素对光降解的影响。实验显示在紫外光和纳米二氧化钛共同存在下，能对工业污水进行处理，砂子负载纳米二氧化钛进行光催化降解的最佳条件：纳米二氧化钛的质量分数为2％，焙烧温度约300℃，工业污水的pH为6．0～7．0。     

氯化聚氯乙烯合金的制备

利用ACR、CPE和EVA作为加工助剂和抗冲改性剂与CPVC共混。对合金的性能作了测试。并对CPVC加工用的配方和工艺条件进行了探讨。结果表明：ACR(最佳用量为5份)能够改善CPVC的加工性能；CPE(最佳用量为9份)和EVA(最佳用量为5份)能提高合金的韧性。     

2,6-萘二甲酸二甲酯与一些二甲基萘所形成的激基复合物

2,6-萘二甲酸二甲酯与一些二甲基萘可以形成激基复合物。本文通过稳态和动态荧光光谱研究了这类激基复合物的形成与分子结构的关系。结果表明,尽管这些二甲基萘的电离能基本相同,但因取代基位置不同使分子中电荷分布不同,从而影响了激基复合物的形成能力。     

Performance of fluorine-added CoMoS/Al2O3 prepared by sonochemical and chemical vapor deposition methods in the hydrodesulfurization of dibenzothiophene and 4,6-dimethyldibenzothiophene

The performance of a new type of CoMoS/Al₂O₃ catalyst, with added fluorine and prepared by sonochemical and chemical vapor deposition (CVD) methods, was investigated in the hydrodesulfurization (HDS) of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). The catalyst, which was designed to contain optimum amounts of fluorine and cobalt, exhibited a higher activity, ca. 4.6 times higher activity particularly in the HDS of 4,6-DMDBT, than a fluorine-free catalyst prepared by a conventional impregnation method. The enhanced activity of the new catalyst can be attributed to the cumulative effects of individual factors involved in the catalyst preparation. That is, the use of a sonochemical synthesis led to a high dispersion of small MoS₂ crystallites on the alumina, and the addition of the Co species to the catalyst by CVD caused a close interaction between the Co species and the MoS₂ crystallites to produce numerous CoMoS species, which are the catalytically active species for HDS. The addition of fluorine increased the amounts of acidic sites in the catalyst, which promoted hydrogenation (HYD) route to a greater extent than the direct desulfurization (DDS) route in DBT HDS and both HYD and DDS routes to similar extents in the case of 4,6-DMDBT HDS. Accordingly, the addition of fluorine led to a greater increase in catalytic activity for 4,6-DMDBT HDS than for DBT HDS.     

6，7-二氢-5H-环戊烷并[b]吡啶

6,7-二氢-5H-环戊烷并[b]吡啶主要用于药物、杀菌剂和抗菌剂的研究,也被广泛应用于制备植物保护剂和合成树脂、防老剂以及塑料制品等。目前因其被作为第四代抗生素头孢匹罗的侧链而成为研究者竞相开发的热点。6,7-二氢-5H-环戊烷并[b]吡啶有实用价值的合成方法主要有N-羟基邻苯二甲酰胺法、丙烯醛法和己二酸二乙酯法。丙烯醛法中6,7-二氢-5H-环戊烷并[b]吡啶的收率为87.4%,具有较好的开发前景。     

Effect of nylon 6 on fracture behavior and morphology of tough blends of poly(2, 6‐dimethyl‐1,4‐phenylene oxide) and maleated styrene‐ethylene‐butadiene‐styrene block copolymer

Ternary blends of poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO), nylon 6, and styrene‐ethylene‐butadiene‐styrene block copolymer grafted with maleic anhydride (SEBS‐g‐MA) were prepared via a melt extrusion, and the fracture behavior, morphology, mechanical properties, and rheology were studied. The compatibilization of the blended components was confirmed by differential scanning calorimetry (DSC) analysis. Mechanical properties evaluation demonstrated that incorporation of nylon 6 resulted in an improvement of the tensile strength, but reduction of both the notched Izod impact strength and elongation at break. Transmission electron microscopy (TEM) observation revealed that the network structure of SEBS‐g‐MA domain was gradually destroyed by incorporating the nylon 6. A conversion of SEBS‐g‐MA domain from the network to the irregular dispersed phase took place when the nylon 6 content reached 20 wt %, which resulted in a reduction of the impact strength. Fracture morphology implied that increase of the tensile strength was caused by the plastic deformation of matrix. Rheology investigation indicated that the melt viscosities could be reduced significantly with increasing the content of nylon 6; thus, the processability was improved. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 99:3336–3343, 2006     

不锈钢负载半导体薄膜光降解有机染料的研究

研究了以100 W直管高压汞灯为光源,以TiO2为催化剂,并将TiO2固定在不锈钢质反应器内壁,对有机染料活性艳红X-3B进行光降解的可行性.结果表明,在本实验条件下,本系统对该染料有明显的光降解作用.浓度为50 mg(A)l-1的染料溶液,经30 min光照,其降解率达95.8%.此外,还探讨了多种因素对光降解的影响.     

用2－（5－溴－2－吡啶偶氮）－5－二乙氨基苯光度法测定镍合金镀层中的镧

叙述镧（Ⅲ）－２－（５－溴－２－吡啶偶氮）－５－二乙氨基苯酚（在ＰＶＡ和ＣＰＢ存在下）胶束增溶配合物的特性。ｐＨ＝１０．１时，Ｌａ３＋与２－（５－溴－２－吡啶偶氮）－５－二乙氨基苯酚（在ＰＶＡ、ＣＰＢ存在下）生成１：４的紫红色配合物。配合物最大吸收峰在６０５ｎｍ，其摩尔吸光系数ε为１．０×１０５Ｌ／ｍｏｌ·ｃｍ。该配合物形成稳定常数（ＬＯｇβ）为１５．９。０～８０μｇＬａ３＋／５０ｍＬ，服从朗伯－比尔定律。此法用于测定镍基合金镀层中的镧，结果令人满意。     

Microstructure and thermal cycling behavior of thermal barrier coating on near-α titanium alloy

Two kinds of thermal barrier coatings (TBCs), consisting of NiCoCrAlY bond coats (BCs) deposited by electron beam-physical vapor deposition (EB-PVD) and high velocity oxy-fuel (HVOF) thermal spraying, respectively, and top 8 wt%Y₂O₃–ZrO₂ (8YSZ) ceramic layers deposited by EB-PVD were prepared on near-α titanium alloys. The field emission scanning electronic microscopy and microhardness indentation are used to study the microstructure and microhardness. Different failure features including cracking patterns and the delamination degree of these two TBCs are discussed according to the thermal cycling tests in the atmosphere. It is found that the morphology of the two BCs deposited by different methods (EB-PVD and HVOF) determines the microstructure and microhardness of their corresponding top 8YSZ layers. The BC prepared by EB-PVD is dense and homogeneous, which leads to a dense and hard 8YSZ with clustered slim columnar grains. The BC prepared by HVOF, however, is porous and inhomogeneous in microstructure and, as a result, the top ceramic layer is loose with low microhardness and clustered coarse columnar grains.     

GMA接枝SEBS及其对PA 6的改性及增容

用双螺杆反应挤出法将甲基丙烯酸缩水甘油酯(GMA)接枝到氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)上(即SEBS-g-GMA)，研究引发剂过氧化二异丙苯用量、活性单体GMA用量对接枝率的影响；通过双螺杆挤出、共混，制备聚酰胺(PA)6／SEBS-g-GMA、PA 6／SEBS-g-GMA／SEBS合金，研究SEBS-g-GMA对合金体系的相容性影响及增韧作用，探讨了合金体系的形态结构和力学性能。