AM－DEAM－AA共聚物的合成及性能研究

合成了丙烯酰胺（ＡＭ）、Ｎ，Ｎ－二乙基丙烯酰胺（ＤＥＡＭ）、丙烯酸（ＡＡ）的三元共聚物。研究了影响共聚反应的主要因素和共聚物溶液性能，通过ＩＲ、ＮＭＲ、ＤＳＣ和ＴＧ对共聚物进行了结构表征。结果表明，共聚物的玻璃化和热分解温度分别为１７３℃和２４０℃，共聚物溶液具有良好的抗剪切性、耐盐性和热稳定性     

聚丙烯微粉固相接枝马来酸酐共聚物的结构表征

利用固相接枝聚合制得聚丙烯微粉与马来酸酐的接枝共聚物。用Ｂｒｕｋｅｒ ＭＳＬ－４００ＭＨＲ．ＲＴ－ＮＭＲ信，采用交叉极化魔角旋转技术，测定了共聚物的＾１３Ｃ－ＮＭＲ，结合ＩＲ，ＷＡＸＤ和ＤＳＣ分析，表征了共聚物的结构。     

AA—AM—SAS三元共聚物的合成及其阻垢性能

以水为溶剂，过硫酸盐为引发剂，合成了丙烯酸（ＡＡ）、丙烯酰胺（ＡＭ）和烯丙基磺酸钠（ＳＡＳ）三无共聚物（ＡＡ－ＡＭ－ＳＡＳ）。用ＩＲ、ＮＭＲ和热分析方法对共聚物进行了表征和测定，并对共聚物的阻垢性能进行了测定。结果表明，合成的三元共聚物是一种性能优良的阻垢分散剂。     

AM—DEAM—AA共聚物的合成及性能研究

合成了然酰胺，Ｎ，Ｎ－二乙基丙烯酰胺，丙烯酸的三元共聚物，研究了影响共聚反应的主要因素和共聚物溶液性能，通过ＩＲ、ＮＭＲ、ＤＳＣ和ＴＧ对共聚物进行结构表征，结果表明，共聚物的玻璃化和热分解温度分别为１７３℃，２４０℃共聚物溶液具有良好的抗剪切切性，耐盐性和热稳定性。     

胶乳型互穿聚合物网络研究：Ⅲ.环氧树脂／聚丙烯酸酯Sem …

通过ＩＲ，ＤＳＣ，ＴＧ，ＴＥＭ溶胀比测定等方法，对丙烯酸丁酯－苯乙烯－甲基丙烯酸甲酯（ＢＡ－Ｓｔ－ＭＭＡ）交联共聚物的结构和ＥＰ／Ｐ（ＢＡ－Ｓｔ－ＭＭＡ）Ｓｅｍｉ－ＬＩＰＮ（ＥＰ为环氧树脂）的结构，热稳定性，溶胀性及乳胶膜的吸水性，乳胶粒开形态进行了研究。结果表明：ＢＡ－Ｓｔ－ＭＭＡ共聚物中主要是无规共聚物，也含有嵌段或接枝共聚链段，但并不太长；当该Ｓｅｍｉ－ＬＩＰＮ受热时，其中的ＥＰ因未交联而先     

AA－AM－SAS三元共聚物的合成及其阻垢性能

以水为溶剂，过硫酸盐为引发剂，合成了丙烯酸（ＡＡ）、丙烯酰胺（ＡＭ）和烯丙基磺酸钠（ＳＡＳ）三无共聚物（ＡＡ－ＡＭ－ＳＡＳ）。用ＩＲ、ＮＭＲ和热分析方法时共聚物进行了表征和测定，并对共聚物的阻垢性能进行了测定。结果表明，合成的三元共聚物是一种性能优良的阻垢分散剂。     

丙烯酰胺—DBMA反相乳液共聚合研究

以ＳＰＡＮ８０作为乳化剂,偶氮二异丁基脒盐酸直（ＡＩＢＡ）作为引发剂,进行丙烯酰胺－Ｎ,Ｎ－二甲基－Ｎ－丁基－Ｎ－甲基丙烯酸乙酯溴化铵（ＤＢＭＡ）反相乳液共聚合反应,研究了单体配比,乳化剂用量,引发剂用量及反应条件等对聚合反应动力学的影响,考察了该共聚物乳液的流变性能。     

聚合物载体茂锆催化剂与乙烯/α-烯烃共聚合

以交联聚（苯乙烯－丙烯酰胺）（ＳＡＡ）为载体，合成了一类新的聚合物载体催化剂——Ｚｒ／ＭＡＯ／ＳＡＡ，催化剂的ＩＲ分析表明，ＳＡＡ与甲基铝氧烷（ＭＡＯ）有两种可能的连接方式，即Ｎ→ＭＡＯ，Ｏ→ＭＡＯ。乙烯／α－烯烃的共聚实验结果表明，该载体催化剂使辛烯有较强的共聚作用，而对癸烯的共聚能力较弱。使用ＤＳＣ方法对不同辛烯含量的共聚物进行了表征。     

NIPA/DMAA共聚物及其水溶液相转变温度的研究EI

合成了不同配比的Ｎ－异丙基丙烯酰胺（ＮＩＰＡ）／Ｎ，Ｎ－二甲基丙烯酰胺（ＤＭＡＡ）共聚物并用红外光谱对它们进行了验证。ＤＳＣ分析表明，共聚物的Ｔｇ随ＮＩＰＡ含量逐渐增大先是显著升高，当ＮＩＰＡ含量为４６．５ｍｏｌ％时，Ｔｇ达１３２℃，随后共聚物的Ｔｇ仅有微小的升高。共聚物水溶液的相转变温度比ＰＮＩＰＡ均聚物高，当ＮＩＰＡ的含量为４６．５ｍｏｌ％时，共聚物的雾点温度高达５１．６℃，我们认为这是因为共聚物分子链的疏水性较ＰＮＩＰＡ均聚物分子链的低所致。     

手性近晶C(Sc*)相串型液晶共聚酯的合成与表征

以２,５－二「４－（Ｓ）－２－甲基丁氧基（苯甲酰氧基」对苯二酚,４,４′－二羟基－,α,ω－二苯氧丁烷和对苯二甲酰氯为单体,采用溶液共缩聚的方法。合成了一系列新的手性近晶Ｃ（Ｓｃ＊）相串型液晶共聚酯,单体的结构通过元素分析、ＩＲ、＾１Ｈ－ＮＭＲ和ＭＳ等方法确证,共聚物通过ＧＰＣ、ＤＳＣ、ＴＧ、ＷＡＸＤ、偏光显微镜和旋光仪等方法表征,发现所有共聚物加热至各自的熔点以上都能形成液晶态,在液晶态可以观察     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Mechanism Study on the Wear of CrAlTiN Coated High-Speed Steel Twist Drills Under Dry Cutting Conditions

As demands about environment protection are growing up, dry cutting technology is getting more and more concerns from all over the world. Main works performed here are study on dry cutting performances and wear mechanisms of M2high-speed steel (HSS) twist drills with CrAlTiN multicomponent coatings, which was deposited using magnetron sputter ion plating system, in drilling 45 and 30CrMnSiA steel, and their comparisons to those in drilling the same steel but using monolayer CrN and commercial TiN coated drills. Drilling performances of drills are evaluated mainly through the measurements of width on outer corner flank land and the cutting forces. Results show that performances of CrAlTiN coated drills are better than those of monolayer CrN and TiN coated drills. In drilling 45 and 30CrMnSiA steel, the average tool life of the CrAlTiN coated drills are 17.2 and 11.8 times higher than those of the uncoated drills. Observing wear of the drill with scanning electronic microscope, results show that there is no crack or spallation of the CrAlTiN coatings in wear zones. Main mechanism of the wear here is adhesion.     

Study on Bond Ability of Arc-Spraying Coatings with Different Surface Pretreatment on Cast-Iron

Arc spraying coatings are widely used in various applications, but uncommon in cast iron substrate. Different surface pretreatment technology is tested on substrates of gray cast iron. Surface roughness and residual stress were measured by TR200 and X-ray diffraction analyzer. Influence of different surface pretreatment methods ( dry blasting and fusebond) on roughness and residual stress was analyzed. The arc-sprayed coatings of wire 3Cr13 (φ2mm) on gray cast iron substrate is studied. The microstructure and interface of bonding layer were observed by SEM. The bond strength was taken by tensile test. Results show that bond strength with grit blasting is higher than fuse-bond; it is feasible to make wire 3Cr13 coating with arc spraying on cast iron substrate roughened by grit blasting.     

Structural Characteristics of TiO2 Ceramic Coating by Micro-Plasma Oxidation

TiO2 ceramic coatings with thickness of 20 μm were formed on the surface of pure titanium by micro-plasma oxidation. Their micro-structures were investigated by by using X-ray diffraction and their surface images were detected by using scan electronic microscope. There were three kinds of TiO2 coatings, pure anatase type TiO2 phase, mixed phases consisted of rutile type TiO2 phase and anatase type TiO2 phase, pure rutile type TiO2 phase. The coating surface with the pure anatase type TiO2 phase is rough, while the coating surface with the pure rutile type TiO2phase is smooth. The upper coating surface with the mixed type TiO2 phases is anatase type TiO2 structure and the subsurface of the TiO2 coating is rutile type TiO2structure.     

Evaluation of fatigue life of steel using steel grain size

The insightful discussion of the relationship between the construction of metallographic and fatigue life and proposition of mathematical relationships describing this relationship was conducted in the paper. This paper presents a method for estimating the fatigue life, based on the construction of the microstructural material taking into account the grain size and the participation of ferrite and pearlite phase.