木塑复合材料界面化学改性研究进展

木塑复合材料是一种用途广泛的新型材料。介绍了国内外木塑复合材料界面化学改性研究进展,包括加入相容剂、加入偶联剂、接枝共聚改性等,并且提出了木塑复合材料界面改性今后的研究方向,为木塑复合材料的后续研究和应用提供了一定的理论基础。     

木塑复合材料的研究进展及发展趋势

总结了木塑复合材料的特点,主要介绍了国内外PE、PP、PVC基等木塑复合材料的研究状况,指出了木塑复合材料研究中所遇到的问题,例如界面相容性差、植物纤维在树脂中分散性差等,并且提出了木塑复合材料今后的研究方向及发展趋势.     

木塑复合材料及其发展

综述了木塑复合材料研究开发技术进展,重点介绍了木塑复合材料的特点、配合、加工以及应用情况。提出了未来木塑复合材料的发展趋势。     

木塑复合材料的发展回顾

由于具有经济和环保的优点,木塑复合材料在近些年得到了快速发展.本文主要回顾了国内外木塑复合材料的发展历史和研究现状.包括所研究的木塑复合材料的种类、力学行为的表征和特点、各种影响木塑复合材料力学性能的因素,以及为提高木塑复合材料力学性能而采取的物理和化学的处理方法和工艺.还介绍了一些用来研究木塑复合材料行为的实验手段.     

玻璃纤维改性木塑复合材料的研究现状

综述了玻璃纤维改性木塑复合材料的力学性能、热学性能、老化性能、加工性能研究现状,客观地评价了玻璃纤维对木塑复合材料性能的影响,并提出了该材料在研究和应用方面需要进一步探讨的问题。     

木塑复合材料力学性能的无损检测

采用纵向共振实验、弯曲振动实验等振动方法对木塑复合材料的力学性能进行了无损检测，并对检测结果进行了分析．研究表明，木塑复合材料的动态弹性模量可以通过无损检测方法测量．木塑复合材料的动态弹性模量随着木塑比的减小而降低；而对于同一木塑比的木塑复合材料，利用各种无损检测法测得的动态弹性模量值相差不大。木塑复合材料的动态弹性模量大于静态弹性模量MOE，且有一定的比值；应用这一比值关系可由动态弹性模量估算静态弹性模量．利用动态的无损检测法测得的弹性模量与静态的破损检测法测得的静曲强度MOR具有密切的相关性；其中，纵向共振实验测得的弹性模量Ep与MOR的相关系数最高；应用相关方程可由动态弹性模量估算静曲强度。     

我国发泡木塑复合材料的研究现状及趋势

对我国发泡木塑复合材料的研究进展进行了概括和评述,指出了在我国进一步深入研究发泡木塑复合材料的重要性。重点介绍了聚丙烯基和聚乙烯基发泡木塑复合材料的研究现状;并展望了发泡木塑复合材料领域研究的发展趋势,认为应在发泡木塑材料的原料种类拓宽、制备工艺过程控制、相关发泡机理以及专用制造设备等方面进行更深入研究。     

聚烯烃木塑复合材料研究进展

木塑复合材料作为一种新型的材料，由于具有易加工、强度高、可生物降解等特点，在建筑、汽车和家居装饰等领域得到广泛的应用。而其中的聚烯烃木塑复合材料将天然的植物纤维和聚烯烃材料复合，得到的聚烯烃木塑复合材料拥有两者的优势，能够取代木材和塑料，未来能够得到很好的应用。就聚烯烃木塑复合材料的优势和问题，综述了聚烯烃木塑复合材料的有关研究现状、界面作用机理以及各种界面改性的方法。     

麦秸粉与HDPE/PP基复合材料的制备及性能研究

本文采用麦秸粉为增强体,分别与高密度聚乙烯(HDPE)、聚丙烯(PP)热塑性塑料基体采用挤出方式混合制备木塑复合材料,研究麦秸粉与HDPE、PP的配比对复合材料性能的影响。利用高速混合机在一定条件下对麦秸粉、热塑性塑料和其他助剂进行混合,利用双螺杆挤出机熔融造粒,单螺杆挤出机挤出成型,对制备的麦秸粉/塑料复合材料进行物理力学性能测试。结果表明:加入少量麦秸粉使木塑复合材料力学性能降低,随着麦秸粉含量的增加,复合材料的力学性能呈提高的趋势;当麦秸粉含量超过一定比例时,木塑复合材料力学性能降低,且冲击性能降低明显;本次试验HDPE基木塑复合材料力学强度略高于PP基木塑复合材料。     

木塑复合材料增强改性研究进展

木塑复合材料作为一种资源循环型、绿色环保型材料,由于具有较好的尺寸稳定性、耐酸耐碱、耐用、易加工成型、维护成本低以及可二次利用等优良特性,在当今社会已经得到广泛应用。但木塑复合材料力学强度较木材而言仍存在一定差距,力学性能偏低、韧性差、不能满足结构部件的使用要求,这些因素制约了木塑复合材料的发展。因此,提高木塑复合材料的力学性能成为研究热点。对国内外改性增强木塑复合材料方法进行了综述,对木塑材料的发展进行了展望。     

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.     

Effect of Permeable Crystalline Material on Steel Reinforcement Corrosion of Concrete

Permeable crystalline materialcan permeate into pores and cracks of concrete and catalyze the reaction between Ca(OH) 2and unhydrated cement to generate a great quantity needle non-soluble crystals, which can stop up the pores and cracks of concrete, and increase the impermeability of concrete. This paper reported the results of a study conducted to evaluate steel reinforcement corrosion of concrete specimens uncoated and coated with permeable crystalline material as well as mixed with the permeable crystalline material. The properties evaluated for corrosion test were water impermeability, water absorption, compressive strength and potential. The results of water impermeability, water absorption, compressive strength clearly showed that the permeable crystalline material could prohibit water, any soluble salts and moisture from penetrating the concrete to cause corrosion, leaking, and other problems, and it did increase the compressive strength, which was favorable for protection of corrosion of reinforcing steel. Moreover, it was concluded from the potential-time curve that the steel reinforcement of uncoated specimen was in the state of activation whereas that of other specimens coated and mixed with the permeable crystalline material was in the state of inactivation. Above all, it was indicated that the permeable crystalline materialis very effective to protect the steel reinforcement of concrete from corrosion.     

The Research and Application About "Dry Peeling Off" Technology for Airplane Surface Paint Layer

In this paper, the principle of spurting take off lacquer were introduced; and with orthogonal method the unsaturate polyester was prepared ;it was easy to peel airplane paint layer off with this material and equipment.     

Quality Study of Honeycomb Core Shaping Without Wax Stabilization

Sandwich panels utilizing honeycomb cores result in lightweight, high-strength units that are very rigid. Indeed, they give honeycomb panels the best strength-to-weight ratio of any construction type available. Conventionally, the wax is poured into the cell of the core to strengthen the structure and prevent the core from being crushed during milling. Much time and labor is required to wax, mill, and clean the cores. In this study, the process of pouring wax into the core was skipped. In other words, the cutter directly milled the core. Experiments showed that the compressive strength of the core produced without wax stabilization was only 3% lower than that of cores produced using the traditional method. In addition, the drum peel strengths of cores produced without wax stabilization were 38.4% higher than cores produced using the traditional method, in which residual wax seriously polluted the adhesive. It was also found that eliminating the wax process can reduce costs.     

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.     

In-process thermal treatment of polylactic acid in fused deposition modelling

Polylactic acid (PLA) is one of the most widely used open source fused filament fabrication materials due to its ease of extrusion, biodegradability, and mechanical strength. The mechanical strength of PLA largely depends on the proper growth of its semi-crystalline structure, which can be severely impaired by a low rate of crystallization, particularly in open source printers. This can be further aggravated by the non-uniform thermal distribution of heat that causes improper curing among the extruded beads of the printing material. As a result, PLA printed on open source printers does not achieve the best mechanical properties. This research, for the first time, proposes an additive-free solution implemented through a detailed set of experimentation to improve the curing rate through in-process temperature variations to cure the joints among the beads. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy is used to confirm the improvements in the bead joints. This work is conducted in two phases of experiments. In the first phase, a full factorial ANOVA is used to investigate various process parameters and the important variables are used in the second phase to print test specimens in four different sets.     

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.