氧化锌/聚苯乙烯纳米复合材料的制备与性能

为提高聚苯乙烯(PS)的热性能及耐溶剂性能,将溶胶-凝胶法合成的纳米氧化锌(ZnO)粒子与苯乙烯原位聚合,制备得到ZnO/PS纳米复合材料,并采用FT-IR、UV、TG等方法对产物进行了表征测试,还考察了纳米ZnO对复合材料的热性能、抗紫外性能和耐溶剂性能的影响。实验结果表明,加入纳米ZnO可提高复合材料的热稳定性、抗紫外性能以及耐溶剂性能。同时,ZnO/PS纳米复合材料的抗紫外性能以及耐溶剂性能均随ZnO纳米粒子的质量分数的增加而增强。     

改性双马来酰亚胺树脂及其复合材料的性能

本文用二苯甲烷型双马来酰亚胺和邻－二烯丙基双酚Ａ反应合成了改性双马来酰亚胺树脂，并对树脂的固化及流变特性进行了表征，同时测定了固化树脂的热性能、机械性能和电学性能，也初步测试了树脂的单向碳纤维复合材料的力学性能。     

丙烯酸酯改性水性聚氨酯乳液性能的研究

用乳液聚合的方法 ,制备了丙烯酸酯改性的水性聚氨酯共聚乳液 (PUA乳液 ) ,并对PUA的耐溶剂性、热性能和机械性能进行了初步的研究。结果表明 ,具有核壳结构的PUA乳液耐溶剂性、热性能和机械性能比水性PU有明显的提高。     

酞菁铜薄膜的真空热蒸发制备及其性能

用真空热蒸发法在玻璃基板上制得酞菁铜薄膜。用原子力显微镜、紫外可见分光光度计及红外光谱仪等分析了酞菁铜薄膜的结构特征，并对薄膜的沉积机理进行了探讨。通过与Ｌ－Ｂ法的比较，发现用真空热蒸发法制备的酞菁铜薄膜结构、性能更佳。     

高吸水性树脂的微波辐射合成工艺及性能研究

针对目前高吸水性树脂合成中存在的问题，采用微波加热提供反应所需热量，以淀粉为原料，过硫酸钾为引发剂，进行丙烯酸接枝共聚反应，开展了高吸水性树脂的微波辐射合成工艺及性能研究，在最佳条件下合成了吸水率为753g/g的高吸水性树脂，性能测试结果表明，该树脂具有良好的吸水和保水性能。本工艺较传统加热合成方法节省时间数10倍，操作条件易于控制，无“三废”排放，是合成高吸水性树脂的清洁生产工艺。     

有机钆玻璃的研制与性能研究

系统地研究了钆元素含量为２．５％￣１０％（质量）的有机钆玻璃的合成方法，并测试了有机钆玻璃的透光率、热稳定性、热机械性能、耐溶剂性能和耐辐照性能，以及对于不同能量的Ｘ、γ射线及热中子辐射屏蔽性能，而且具有良好的耐辐照性能和透光性能。     

BOPET薄膜涂覆改性用水性丙烯酸树脂的合成

以甲基丙烯酸甲酯(MMA)、丙烯酸乙酯(EA)为主单体,丙烯酸(AA)为功能性单体,通过溶液聚合方法合成了水性丙烯酸树脂。研究了丙烯酸含量、单体配比、加料方式、反应温度等条件对树脂性能和涂膜性能的影响,确定了最佳合成工艺。采用红外光谱(IR)、热失重分析(TGA)等测试手段对树脂的结构和性能进行了表征。     

1998-1999年中国聚芳醚酮的研究及应用文摘

(续上期 )聚醚酮酮和磺化聚醚酮酮物理性能的研究 /易回阳 (湖北师范学院化学系 )、曾繁涤 (华中理工大学化学系 ) /现代塑料加工应用。1998,10 ( 2 ) ,41～ 43。研究了聚醚酮酮 (ＰＥＫＫ )和磺化聚醚酮酮(ＳＰＥＫＫ)的密度、吸水率、耐溶剂性能和电性能 ,用Ｘ 射线衍射研究了结晶度的大小、用差热分析、差示扫描量热分析和热失重法进行了热性能的研究 ,并对模压成型条件进行了探讨。与磺化聚醚酮酮相比 ,聚醚酮酮的密度略大 ,吸水率较小 ,耐溶剂性能好 ,结晶度大 ,熔点及热分解温度较高。纳米ＳｉＣ和微米ＳｉＣ填充聚醚醚酮的磨损机理研…     

丙烯酸改性酚醛环氧树脂的合成工艺研究

以三乙胺、二甲苯胺为催化剂合成了丙烯酸改性F－44酚醛环氧树脂，研究了反应时间、温度、催化剂用量对丙烯酸转化率的影响，测试了产物的光化学反应活性、力学性能，耐酸碱性、耐溶剂性等。结果表明，反应温度95℃、6h可以制得含环氧基的丙烯酸酚醛环氧树脂（AFEE）。该树脂制备的涂膜具有良好的力学性能、耐溶剂性和耐酸碱性等。光敏实验表明，AFEE树脂中的碳碳双键具有较高的光化学反应活性。     

高残炭热固性酚醛树脂的合成及表征

以萘酚部分替代苯酚合成了高残炭热固性酚醛树脂。研究了萘酚用量、催化剂用量、反应温度和时间对残炭率的影响,确定了合成工艺条件。用IR和TGA对产品的化学结构与热性能进行了分析测定,结果表明,树脂分子链中不稳定的醚键含量低于普通酚醛树脂,产品的分解温度为460℃,残炭率可达61.3%,适用于碳/碳复合材料和耐烧蚀材料的树脂基体。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

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 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.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

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.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

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.