Dehydration,Water Vapor Adsorption and Desorption Behavior of Zn[B3O3(OH)5] · H2O and Zn[B3O4(OH)3]

The dehydration behaviors of two different hydrated zinc borate species, Zn[B₃O₃(OH)₅] · H₂O and Zn[B₃O₄(OH)₃], which are industrially important flame retardants, were studied by thermal gravimetric(TG) analysis and in situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. Dehydration onset temperatures of Zn[B₃O₃(OH)₅] · H₂O and Zn[B₃O₄(OH)₃] were 129 and 320°C, respectively, at a 10°C/min ramp rate. A very small amount of boric acid was volatilized in addition to water vapor when both samples were heated at 250°C. A significant amount of water vapor was adsorbed by Zn[B₃O₃(OH)₅] · H₂O from air at 25°C. However, Zn[B₃O₄(OH)₃] adsorbed a very small amount of water under the same conditions. Both zinc borates did not have a tendency to cake during storage.     

一种新型有机硼交联剂与硼砂交联剂的对比

从瓜胶压裂液的粘度、交联时间、粘时性、滤失性和破胶性五方面,评价了有机硼ALP-3和硼砂交联剂对压裂液冻胶性能的影响。结果表明,两种交联剂均能满足现场施工要求,但新型有机硼交联剂更适用于温度较高、井深较大的油气井。     

Preparation and properties of poly(urethane acrylate) (PUA) and tetrapod ZnO whisker (TZnO‐W) composite films

Tetrapod zinc oxide whiskers (TZnO‐Ws) were successfully synthesized via a thermal oxidation method and confirmed using Fourier transform infrared spectroscopy, X‐ray diffraction and scanning electron microscopy. A series of poly(urethane acrylate) (PUA)/TZnO‐W composite films with various TZnO‐W contents were prepared via a UV curing method and their physical properties were investigated to understand their possible use as packaging materials. The morphological, thermal, mechanical, antibacterial and barrier properties of the PUA/TZnO‐W composite films were interpreted as a function of TZnO‐W content. The thermal stability, barrier properties and antibacterial properties of the composite films, which were strongly dependent upon their chemical and morphological structure, were enhanced as the TZnO‐W content increased. The oxygen transmission rate and water vapor transmission rate decreased from 614 to 161 cm³ m^?2 per day and 28.70 to 28.16 g m^?2 per day, respectively. However, the mechanical strength of the films decreased due to the low interfacial interaction and poor dispersion with high TZnO‐W loading. The enhanced barrier properties and good antibacterial properties of the PUA/TZnO‐W composite films indicate that these materials are potentially suitable for many packaging applications. However, further studies are needed to increase the compatibility of polymer matrix and filler. © 2012 Society of Chemical Industry     

石膏晶须制备的研究进展

介绍了目前石膏晶须的制备方法,重点阐述了在湿法磷酸生产中制造石膏晶须的绿色化学工艺。     

ABS/镁盐晶须复合材料的研究

以（乙烯／乙酸乙烯酯／苯乙烯）三元共聚物（BS树脂）为增容荆，采用双螺杆挤出机制备了（丙烯腈／丁二烯／苯乙烯）共聚物（ABs）／镁盐晶须复合材料，研究了BS树脂、镁盐晶须用量对复合材料力学性能、流动性能的影响、结果表明，加入BS树脂有利于提高复合材料的拉伸强度和冲击强度，复合材料的熔体流动速率（MFR）随BS树脂用量增加而增大，且其MFR对温度或负荷呈非线性函数关系，比ABS对负荷更为敏感．     

硼及硼酸盐产品开发和应用前景

论述了硼及硼酸盐在现代无机盐工业中的地位和作用,以及在国民经济各部门、工农业生产、国防工业以及高新技术领域的应用。结合国内外硼化物的发展趋势,并根据中国的实际情况提出了当前应开发和发展的硼、硼酸盐及含硼新型材料有:纤维复合材料、元素硼粉和同位素系列产品、硼金属化物(如硼化钙、硼化锆、硼化钛)和含硼非晶态金属材料、有机硼化物(硼酸酯、烷基硼)、氟硼酸盐、硼酸钙、硼酸锌、硼酸镁和硼酸铝晶须材料。     

Passivity and Corrosion of Cu–<Emphasis Type="BoldItalic">x</Emphasis>Zn (<Emphasis Type="BoldItalic">x</Emphasis> = 10–40 wt%) Alloys in Borate Buffer Containing Chloride Ions

The electrochemical behaviour of Cu–xZn alloys and of Cu and Zn metals was studied by cyclic voltammetry and chronopotentiometry in borate buffer, pH = 9.2, with and without the addition of chloride ions in the range from 0.01 m to 1 m. In general, the shape of voltammograms of four Cu–xZn alloys with 10 – 40 wt.% of zinc resembles that of copper more than that of zinc. With increasing zinc content several characteristics of zinc are observed. In borate buffer containing chloride anions, Cu–xZn alloys are susceptible to pitting corrosion. The breakdown potential, E_b, at which the current density in the passive region starts to increase abruptly, becomes more negative with increasing zinc content in the alloy. The general relationship E_b = a + b log c_NaCl held in all cases, with constants a and b, however, being dependent on the zinc content of the alloy and on the chloride concentration. The corrosion resistance of Cu–xZn alloys was less than that of copper metal but significantly greater than that of zinc.     

硼酸锌协效二乙基次膦酸铝阻燃PA6

采用硼酸锌(ZB)与二乙基次膦酸铝(ADP)协同阻燃聚酰胺6(PA6).对其阻燃性能和力学性能进行了探讨,并运用垂直燃烧、极限氧指数、锥形量热、热失重分析、扫描电子显微镜以及拉曼光谱对阻燃机理进行了探究.结果表明,ZB作为协效剂,与ADP的协同阻燃效果显著;当在PA6中添加1.5％(质量分数,下同)ZB和8.5％ADP...     

无机盐晶须的制备以及应用研究进展

无机盐晶须是在人工可控条件下生长成的具有一定长径比的一种纤维,具有强度高、模量高、化学性质稳定、易与基体结合等特点,广泛应用于造纸、建筑材料、高分子材料等领域。主要介绍了无机盐晶须的生长机理、常见的无机盐晶须种类、制备方法以及应用范围。重点介绍了无机盐晶须的制备方法,包括气相法、固相法和液相法,其中液相法为制备无机盐晶须常见的方法,主要从水热合成法、碳化法、常压酸化法以及溶胶凝胶法进行介绍;其次,介绍了无机盐晶须在阻燃材料、建筑材料、复合材料和摩擦材料中的应用,并指出晶须对复合材料的作用机理主要体现在负荷传递、裂纹桥连、裂纹偏转和拔出效应4个方面;最后指出,目前无机盐晶须的制备及应用仍处于实验室阶段,其制备以及应用过程中仍存在能耗高、产物形貌不均一、产量低、设备复杂、工业化程度差等一些问题。通过分析得出,开发低成本、低能耗的无机盐晶须制备方法仍是主要的亟需解决的难题。     

Nickel-based metal−organic framework-derived whisker-shaped nickel phyllosilicate toward efficiently enhanced mechanical,flammable and tribological properties of epoxy nanocomposites

Metal−organic framework-derived materials have attracted significant attention in the applications of functional materials. In this work, the rod-like nickel-based metal−organic frameworks were first synthesized and subsequently employed as the hard templates and nickel sources to prepare the whisker-shaped nickel phyllosilicate using a facile hydrothermal technology. Then, the nickel phyllosilicate whiskers were evaluated to enhance the mechanical, thermal, flammable, and tribological properties of epoxy resin. The results show that adequate nickel phyllosilicate whiskers can disperse well in the matrix, improving the tensile strength and elastic modulus by 13.6% and 56.4%, respectively. Although the addition of nickel phyllosilicate whiskers could not obtain any UL-94 ratings, it enhanced the difficulty in burning the resulted epoxy resin nanocomposites and considerably enhanced thermal stabilities. Additionally, it was demonstrated that such nickel phyllosilicate whiskers preferred to improve the wear resistance instead of the antifriction feature. Moreover, the wear rate of epoxy resin nanocomposites was reduced significantly by 80% for pure epoxy resin by adding 1 phr whiskers. The as-prepared nickel phyllosilicate whiskers proved to be promising reinforcements in preparing of high-performance epoxy resin nanocomposites.