端氨基醚酰亚胺齐聚物改性BMI的研究

采有自制,可以与BMI发生反应且中,低温条件下惰性的单体与溶剂,合成了胺基醚酰亚胺,然后将BMI加入含有胺基醚酰亚胺的反应溶剂中熔融使之呈均匀透明的状态,得到了改性BMI（RS／AEI／BMI）体系,详细研究了RS／AEI／BMI体系的反应性和固化树脂的力学性能,耐热性,并以扫描电镜为手段,对固化树脂的断口形貌进行分析。结果表明,固化树脂宏观上呈现半透明状,微观上存在二相体系。正是由于这种相结的存在,导致改进BMI（RS／AEI／BM）体系具有良好的性能,冲击强度18.5kJ/m^2。HDT＝270℃。     

聚醚扩链脲增韧环氧树脂/双氰双胺固化体系

以聚醚PPGl000、异氰酸酯、二胺为原料，合成了聚醚扩链脲(EU)，系统考察了EU改性的环氧树脂E一51／双氰双胺(dicy)固化体系的固化反应活性、动态力学行为、冲击性能和断裂面形态结构。并对体系的冲击性能、形态结构与动态力学行为之间的关系进行了探讨。结果表明，改性体系固化反应活性明显提高，固化反应表现活化能降低，固化反应峰顶温度从190℃降低至140℃，固化反应的表现活化能由145．5kJ／mol降至73．6kJ／mol；改性体系冲击强度明显提高，较未改性的E-51／dicy体系提高了9倍，较小分子取代脲改性的E-51／dicy体系提高了7倍；其冲击试样断裂面的形态具有明显的韧性断裂特征。     

咪唑封端扩链脲改性环氧树脂E-51/酸酐MTHPA体系性能研究

以端羟基聚环氧丙烷1000，甲苯二异氰酸酯（TDI），2－甲基咪唑为原料，合成了扩链脲TI，利用DSC，动态热机械分析仪DMA，冲击试验机及扫描电镜（SEM）等手段对TI改性的环氧树脂E－51／甲基四氢化邻苯二甲酸酐（MTHPA）固化体系的反应活性，动态力学行为，冲击性能，断裂面形态结构进行了系统研究，结果表明，改性后的E－51／MTHPA体系反应活性明显提高，固化反应峰顶温度较未改性体系降低160℃－200℃，固化反应的表观活化能由未改性体系的160．3kJ/mol降至63kJ/mol-87kJ/mol，同时与未改性体系相比，经过改性的环氧树脂固化体系冲击强度有较大的提高，在TI含量为5％时体系的玻璃化转变温度Ts达到最高，各改性体系冲击断面呈韧性断裂。     

改性双来亚酰亚胺树脂的研究

合成了２，２′－亚甲基－二（４－甲基－６－烯丙基）苯酚，和它增韧二苯甲烷型双马来酰亚胺树脂，对改性双马亚酰亚胺预聚物的凝胶化时间、ＤＳＣ分析和ＦＴ－ＩＲ分析的研究，得到了改性双马亚酰胺树脂体系的固化条件来１８０℃／１ｈ＋２００℃／２ｈ＋２５０℃４／ｈ；热重分析法研究了双马亚酰亚胺树脂体系的热分解反应动力学，得出体系的的热分解反应活化能为２７４．４ｋＪ／ｍｏｌ；改性双马来酰亚胺树脂体系常弯曲强度为１     

改性双马来酰亚胺树脂的研究

合成了２，２′－亚甲基－二（４－甲基－６－烯丙基）苯酚，用它增韧二苯甲烷型双马来酰亚胺树脂，对改性双马来酰亚胺预聚物的凝胶化时间、ＤＳＣ分析和ＦＴ－ＩＲ分析的研究，得到了改性双马来酰亚胺树脂体系的固化条件为１８０℃／１ｈ＋２００℃／２ｈ＋２５０℃／４ｈ；热重分析法研究了双马来酰亚胺树脂体系的热分解反应动力学，得出体系的热分解反应活化能为２７４．４ｋＪ／ｍｏｌ；改性双马来酰亚胺树脂体系常温弯曲强度为１２４ＭＰａ，弯曲模量为３７７４．６ＭＰａ，２５０℃下弯曲强度保留６９％，弯曲模量保留７８％。     

端氨基亚胺齐聚物改性BMI固化特征及粘度特性

采用旋转粘度仪和动态DSC技术分析研究了端氨基亚胺齐聚物改性BMI树脂的固化反应过程和粘度特性。其结果表明，树脂在130℃-195℃之间存在一个宽广的低粘度平台区；固化反应过程中的吸热和放热的共同作用使得固化反应仅有一个平缓的放热峰，固化反应为1．02级反应，反应活化能为107kJ/mol。     

聚氨酯改性环氧树脂/聚苯乙烯SIPNs固化动力学(Ⅰ) 环氧树脂固化剂含量对体系固化过程的影响

用化学滴定,粘度测定等方法,研究了环氧树脂固化剂（Ｔ３１）用量对聚醚型聚氨酯改性双酚Ａ型环氧树脂（ＰＵＤＧＥＢＡ）／聚苯乙烯（ＰＳｔ）室温同步ＩＰＮｓ体系固化动力学行为的影响。研究结果表明,增加Ｔ３１的用量,可以大大地缩短上述体系的凝胶时间。两个网络固化速度的峰值相对位置未改变。苯乙烯的固化受扩散控制,反应级数为２．０级;ＰＵＤＧＥＢＡ的固化为自动催化机理,反应级数为３．０级。     

反应型液晶聚合物改性环氧树脂性能的研究

合成了一种端基含有活性基团的热致性液晶聚合物（LCPU），用其改性环氧树脂CYD－128／4，4‘-二氨基二苯砜（DDS）固化体系，对改性体系的冲击性能，拉伸性能，弹性模量，断裂伸长率，玻璃化转变温度Tg与LCPU含量的关系进行了探讨，对不同种类液晶化合物对CYD－128／DDS体系改性效果进行了比较，用扫描电镜（SEM）对材料断面的形态结构进行了研究，结果表明，LCPU的加入可以使固化体系的冲击强度提高2－3．5倍，拉伸强度提高1．6－1．8倍，弹性模量提高1．1－1．5倍，断裂伸长率提高2－2．6倍，Tg提高36℃－60℃，改性后材料断裂面的形态逐渐呈现韧性断裂特征。     

液体端羧基丁腈橡胶改性双马来酰亚胺结构胶粘剂(Ⅱ)DACPE固化BMI体系胶粘剂的改性及形态结构

液体端羧基丁腈橡胶(CTBN)改性双马来酰亚胺树脂（BMI）中，不同共混方式、不同分子量及不同-CN含量的CTBN对DACPE体系双马来酰亚胺胶粘剂力学性能的影响不同，由此选择性能优异的CTBN制备出改性4,4‘-双（对-氨基苯甲酰基）二苯醚（DACPE）固化1^#双马来酰亚胺体系胶粘剂。     

含硅苯并噁嗪的制备及其对双马来酰亚胺树脂固化反应动力学的影响

通过溶剂法设计合成出了结构中含有硅元素的新型苯并噁嗪单体(Si-BOZ),以其作为改性体系对双马来酰亚胺树脂(BMI)进行共混改性,在降低BMI预聚物粘度的同时优化其固化工艺,改善其综合性能。选用平板小刀法测定了Si-BOZ、BMI、Si-BOZ/BMI等树脂体系的凝胶时间,红外光谱(FTIR)跟踪研究了Si-BOZ和BMI在固化过程中所发生的化学反应,非等温差示扫描量热法(DSC)研究了Si-BOZ/BMI树脂体系的固化反应动力学特征,并通过Kissinger法和Ozawa法对两者固化过程中的各参数进行了讨论。     

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.