HDPE／顺丁橡胶共混材料磨蚀速率的研究

用自制的旋臂式磨蚀实验仪，研究了高密度聚乙烯（ＨＤＰＥ）／顺丁橡胶、高密度聚乙烯和４５＾＃钢在攀枝花尾矿矿浆中的磨蚀速率与磨蚀温度和磨蚀时间的关系。结果表明，在２０－４８℃时，Ｗ（ＨＤＰＥ／ｃｉｓ－ＢＲ）和Ｗ（ＨＤＰＥ）分别保持在０．１７－０．２０ｍｍ／ａ和０．２２－０．３０ｍｍ／ａ。在５５℃时，Ｗ（ＨＤＰＥ／ｃｉｓ－ＢＲ和Ｗ（ＨＤＰＥ）分别增加至０．２８和０．３９ｍｍ／ａ，在２０－５５℃时，Ｗ（     

HMW—HDPE与LMW—HDPE的共混改性

选用一种高分子量高密度聚乙烯（ＨＭＷ－ＨＤＰＥ）和一种低分子量高密度聚乙烯（ＬＭＷ－ＨＤＰＥ），对它们的共混行为和共混物的热性能、流动性能和力学性能进行了研究。结果表明，在研究的共混比范围内，由ＤＳＣ发现双组分体系可能存在共晶相。ＨＭＷ－ＨＤＰＥ／ＬＭＷ－＝ＨＤＰＥ共混体系的熔体指数基本符合Ａｒｒｈｅｎｉｕｓ粘度加和方程：ＭＩ＝ＭＩ．ＭＩ２。在ＬＭＷ－ＨＤＰＥ质量百分含量为２０％时，共混体系的拉伸     

LLDPE及VLDPE对LDPE／HDPE共混物拉伸性能的影响

研究了线性低密度聚乙烯（ＬＬＤＰＥ）和极低密度聚乙烯（ＶＬＤＰＥ）对高密度聚乙烯（ＨＤＰＥ）／低密度聚乙烯（ＬＤＰＥ）共混物拉伸性能的影响。由于ＬＬＤＰＥ或ＶＬＤＰＥ的加入，改善了ＨＤＰＥ与ＬＤＰＥ间的相互作用，提高了ＨＤＰＥ／ＬＤＰＥ共混物的拉伸性能。     

PET／HDPE共混物的形态结构及力学性能的研究

利用ＩＲ、ＳＥＭ、ＤＳＣ和力学测试等分析方法，研究了熔融接枝高密度聚乙烯（ＨＤＰＥ－ｇ－ＭＡ）和界面改性剂（ＩＭ）对ＰＥＴ／ＨＤＰＥ共混物形态结构、界面偶联状况和力学性能的影响。结果在明，ＨＤＰＥ－ｇ－ＭＡ改善了ＰＥＴ与ＨＤＰＥ的相容性，使ＨＤＰＥ较均匀地分散在ＰＥＴ基体中，但并未检测到ＰＥＴ／ＨＤＰＥ－ｇ－ＭＡ界面有化学反应发生。界面改性剂的作用在于，一方面通过提高ＰＥＴ基体的粘度，并接近ＨＤＰＥ相的粘度而使分散相细化；另一方面通过与ＨＤＰＥ－ｇ－ＭＡ和ＰＥＴ的偶联反应而增强了ＰＥＴ／ＨＤＰＥ－ｇ－ＭＡ界面粘结，从而显著地提高了共混物的抗冲击性能。     

电子束辐照对HDPE及其与Mg(OH)_2共混体系力学性能影响的研究EI

研究了高密度聚乙烯（ＨＤＰＥ）经电子束辐照后性能的变化，与Ｍｇ（ＯＨ）２的相容性，以及ＨＤＰＥ／Ｍｇ（ＯＨ）２共混体系的力学性能。实验结果表明，经电子束辐照后，ＨＤＰＥ分子被引入了极性基团（羰基），增加了ＨＤＰＥ与Ｍｇ（ＯＨ）２的相容性，使ＨＤＰＥ／Ｍｇ（ＯＨ）２体系的拉伸强度得到提高。     

电子束辐照对HDPE及其与Mg(OH)_2共混体系力学性能影响的研究

研究了高密度聚乙烯（ＨＤＰＥ）经电子束辐照后性能的变化，与Ｍｇ（ＯＨ）２的相容性，以及ＨＤＰＥ／Ｍｇ（ＯＨ）２共混体系的力学性能。实验结果表明，经电子束辐照后，ＨＤＰＥ分子被引入了极性基团（羰基），增加了ＨＤＰＥ与Ｍｇ（ＯＨ）２的相容性，使ＨＤＰＥ／Ｍｇ（ＯＨ）２体系的拉伸强度得到提高。     

超声辐照对HDPE加工及力学性能的影响

研究了在挤出过程中超声辐照功率和时间对高密度聚乙烯（ＨＤＰＥ）加工流变性能及力学性能的影响,结果表明,超声辐照作用可以ＨＤＰＥ分子链段的运动,使ＨＤＰＥ熔体的挤出口模压力和表现粘度下降,明显提高了聚乙烯熔体的流动性,挤出物出口膨胀减小,外观质量明显提高,ＨＤＰＥ经超声辐照后,其拉伸模量及断裂伸长率均得到同时,为改善ＨＤＰＥ制品的性能提供了新途径。     

热致液晶性纤维素衍生物及其热塑性塑料复合物熔体流变行为的研究

用毛细管流变仪研究了乙基纤维素（ＥＣ）及其高密度聚乙烯（ＨＤＰＥ）复合物，纤维素芳族酯（ＣＡＥ）及其聚碳酸酯（ＰＣ）复合物的剪切流变特性和机理。结果表明，ＥＣ对ＨＤＰＥ／ＥＣ复合物的粘度影响不大，而少量（５％）ＣＡＥ的加入使ＰＣ／ＣＡＥ复合物粘度大大下降，且复合物流变曲线呈现新的特征。     

PE—g—MAH在PA6／HDPE塑料合金中增溶作用的研究

本文对高密度聚乙烯（ＨＤＰＥ）与顺丁烯二酸酐（ＭＡＨ）接枝反应产物在ＨＤＰＥ／尼龙６（ＰＡ６）塑料合金体系中的增溶作用进行了探讨，初步研究的结果表明，改性聚乙烯（ＧＰＥ）对塑料合金体系有明显的界面增溶作用，扫描电镜（ＳＥＭ）、红外光谱分析（ＩＲ）等分析结果证实，在塑料合金两相界面之间形成了分子联接。     

紫外线辐照对高密度聚乙烯结晶行为及热分解动力学参数的…

采用ＤＳＣ、ＷＡＸＤ研究了紫外线辐照对高密度聚乙烯结晶性能的影响。结果表明，随辐照时间的增加，ＨＤＰＥ结晶度增大，熔融峰向低温方向移动，但晶胞结构基本保持不变。通过ＴＧＡ对紫外线辐照ＨＤＰＥ的热稳定性进行了研究，采用４８６微机对紫外线辐照ＨＤＰＥ分解动力学方程     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

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.     

Synthesis of Alumina-Zirconia Nanocomposites by Solgel Process

Al₂O₃-ZrO₂ nanocomposites were developed starting with the solgel process. Composite alumina-zirconia nanopowders were synthesized from metallorganic precursors (Aluminium secondary butoxide and zirconium Iso propoxide) using the solgel process. The parameters affecting the synthesis—solvent, concentration of precursor, R/H ratio (i.e., dilution of water in solvent)—were varied as also the temperature and pH. BET and TEM were used to measure nanosize. Diffuse reflectance spectroscopy and also qualitative optical absorption led to identical particle size estimate. The variation of process parameters was used to study the effect and interdependence of process parameters. Artificial Neural Networks was used to rigorously analyze the process. Although this led to confirmation of interdependence of parameters, the presence of a single overwhelming solvent variable was also established. Then the optimal process was used to synthesize more nanopowder. To produce bulk nanocomposite the nanopowders were sintered by varying the temperature and time period. The sintered lithoids were probed with a vickers hardness tester to measure elastic modulus, hardness, and fracture toughness. The results showed high elastic modulus, modest hardness, and very high fracture toughness.     

Friction Stir Processing Strategies for Uniform Distribution of Reinforcement in a Surface Composite

Friction stir processing (FSP) is an important technique for preparing surface composites. Fabricating defect-free surface composites with uniform particle distribution by FSP is a challenging task. In this study, silicon carbide particles reinforced AA5083 alloy surface composites was fabricated using different FSP strategies including variation in process parameters, dual-tool processing and tool offset overlapping. Material flow of the processed material with reinforcement particles demonstrated that the distribution of particles was influenced by the stirring action of the probe as well as the extrusion of the plasticized material due to the movement of the tool. Process parameters, particularly rotational speed, showed a dominant influence on the distribution of silicon carbide particles.     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

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.     

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