Study on the graphite nanosheets/resin shielding coatings

Shielding coatings based on graphite nanosheets were prepared by compounding method. The surface morphology of the graphite nanosheets and conductive coatings was examined by scanning electron microscopy. The surface resistivity of the coatings was greatly declined by incorporating the graphite nanosheets. The electromagnetic interference shielding effectiveness (SE) from 0.3 MHz to 1.5 GHz was also studied, and found that the SE of the coatings was consistent with its conductivity. The best sample was shown to exhibit up to 38 dB of SE at 1.5 GHz (with a thickness of 400 μm). The main shielding mechanism of the system was reflection and multiple reflections.     

Swelling behavior of poly(sodium acrylate)/kaoline superabsorbent composite

Using partly neutralized acrylic acid as monomer, kaoline ultrafine powder as filler and N,N′‐(dimethyl)acrylamide as crosslink agent, poly(sodium acrylate)/kaoline superabsorbent composite was synthesized by aqueous solution polymerization method. Using the superabsorbent composite as collagen, a hydrogel was prepared. The influence of the neutralization degree of superabsorbent collagen, the compositions, the concentration, and the pH value of exterior solution on the swelling behavior of the hydrogel was investigated. It was found that the swelling capability of the hydrogel depended on the groups on the collagen. The swelling capability of the hydrogel relied on the ionic intensity, molecular polarity, molecular volume, as well as the concentration of exterior solution. When the pH value of exterior solution was equal to seven, the hydrogel has a maximum swelling value of 800 times. POLYM. ENG. SCI. 46:324–328, 2006. © 2006 Society of Plastics Engineers     

α─甲基苯乙烯和丙烯腈乳液共聚研究

本文用α─甲基苯乙烯（α—ＭＳ）和丙烯腈（ＡＮ）为主要原料，用乳液聚合技术合成了α—ＭＳ—ＡＮ共聚物．主要研究了乳化剂种类和用量、引发剂用量、单体的不同加料方式和配比对聚合的影响．同时考察了单体的不同配比对共聚物性能的影响．并通过ＩＲ等手段对共聚物进行了表征，最终得到了令人满意的α—ＭＳ—ＡＮ共聚物。     

树脂固体酸催化剂用于合成尿囊素研究

对三阳离子交换树脂在乙醛酸与尿素缩合反应中的催化活性进行了研究。实验得到其最佳反应条件为：尿素与乙醛酸摩尔比4：1，反应温度70℃，反应时问8h。在此条件下，尿囊素产率达到69．6％。实验结果还表明，阳离子交换树脂催化剂优于HZSM-5分子筛催化性能。     

伊朗轻质原油减渣馏分油水界面张力的研究

The vacuum residual from Iranian Light crude oil are separated into a series of 16 narrow fractions according to the molecular weight by the supercritical fluid extraction and fractional (SFEF) technology. The chemical element and the UV spectrum of each fraction are analyzed. The effects of several factors on the interfacial tension are investigated, which are the fraction concentration in oil phase, the ratio of oil component, the salts dissolved in the water phase and the pH value. The interfacial tension decreases rapidly as the concentration of the residual fraction in the oil increases, showing a higher interfacial activity of the fraction. The interfacial tension changes, as the amount of absorption or the state of the fractions in the interface changes resulting from different ratios of oil, different kinds or concentrations of salts in water, and different pH values. It is concluded that the intrfacial tension changes regularly, corresponding to the regular molecular parameters of the vacuum residual fractions.     

Preparation,crystallization, and spinnability of poly(ethylene terephthalate)/silica nanocomposites

Poly(ethylene terephthalate) (PET)/silica nanocomposites were successfully prepared by in situ polymerization. Silica nanoparticles were uniformly dispersed in the process of polymerization. By means of hot‐stage polarization microscope and DSC, the influence of nanosilica on the crystallization of PET/silica nanocomposites has been clarified. The results show that nanosilica does not behave as a nucleating agent in PET but postpones the appearance of crystallite. This phenomenon is very favor to improve spinnability. The investigation on melt spinning of PET/silica nanocomposites also shows that it is advantageous to spinning with descending the spinning temperature. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 2564–2568, 2007     

A Glass–Ceramic Derived from High TiO2-Containing Slag: Microstructural Development and Mechanical Behavior

A novel glass–ceramic material was developed from the melt of a TiO₂-containing iron-making slag with additional waste glass. The high percentage (∼20 wt% TiO₂) of this network-modifying oxide has promoted a crystallization of the parent glass, resulting in a fine-grained, homogeneous polycrystalline material with high mechanical properties ( E =120 GPa, flexural strength=∼180 MPa, and Vickers hardness=7 GPa) after a heat treatment at 1100°C for 2 h. The room temperature and elevated temperature fracture toughness were also studied. The main crystalline phases of the glass–ceramic material were of the pyroxene series until heat-treatment temperature reached 1000°C, at which titanium-rich perovskite and armalcolite crystals became the dominant phases. The end material is high-strength, aesthetically acceptable (metallic gray or opaque brown colored), and suitable for structural and architectural applications.     

用于测定钢液低氧含量的双层固体电解质研究

采用“毛坯浆料法”在ＺｒＯ２（９％摩尔含量ＭｇＯ）管状固体电解质基体表面制备了厚度为１－４μｍ的ＺｒＯ２（１０％摩尔含量Ｙ２Ｏ３）固体电解质涂层，并分别对此在本实验室和美国ＬｅｅｄｓａｎｄＮｏｒｔｈｒｕｐ公司进行了钢液低氧含量测试，结果表明：涂层没有破坏基体的抗热震性：氧浓差电池电动势的重现性偏差由原来的±２ｍＶ；电动势的绝对值提高１０ｍＶ左右；而比日本Ｔｏｒａｙ公司的同类产品提高３５ｍＶ，这说明     

运用设计管理模式建立卷烟品牌价值

文章通过阐述设计管理模式的运用及其目标,分析了设计管理与品牌价值之间的相互关系,从提升产品质量,提升品牌的功能价值和附加价值几方面进行了系统研究。提出在当前卷烟品牌竞争形势下,应当将设计管理模式有效地运用到企业的产品设计和品牌战略之中,充分肯定了设计管理作为创新型管理手段在建立卷烟品牌价值方面具有的重要意义。     

聚氨酯弹性体的电致伸缩效应

电致伸缩是指在外电场作用下电介质所产生的与场强二次方成正比的应变。近年来对聚氨酯电致伸缩性能的研究发现，聚氨酯弹性体综合了压电聚合物与传统的锆钛酸铅(PZT)压电陶瓷片的优点，具有很好的应用前景，本文简单介绍了聚氨酯的电致伸缩效应。