氧化钇纳米颗粒对无铬达克罗涂层耐蚀性能的影响

采用极化曲线、中性盐雾测试、SEM和EDX方法,探讨了Y2O3纳米颗粒对普通碳钢表面无铬达克罗涂层耐腐蚀性能的影响。结果表明：无铬达克罗涂层中掺杂少量Y2O3纳米颗粒可增强其耐蚀性能,使涂层的腐蚀电位升高,腐蚀电流密度降低。Y2O3纳米颗粒不仅可抑制阴极还原反应,从而控制整个腐蚀过程,也可作为物理屏障阻碍腐蚀介质对涂层内部的渗透,但它不能改变极化曲线形状。本无铬达克罗涂层中Y2O3的最佳含量为20 g/L。     

船板钢CCT曲线的测定与分析

利用Gleeble3500热模拟试验机对船板用钢进行模拟试验,采集温度-膨胀量曲线,并结合金相法、硬度法绘制出试验材料的CCT曲线。分析CCT图和试验钢显微组织照片,得出不同冷却速度下该钢的组织转变情况。随着冷却速度的逐渐增大,试验钢的组织由多边形铁素体、准多边形铁素体逐步向粒状贝氏体、贝氏体铁素体的转变,同时显微硬度也随冷速的升高呈明显的上升趋势。     

智能型高分子凝胶及其在化工分离领域中的应用

介绍了具有温度、光、电场、pH值、化学物质等刺激响应性的各种智能型高分子化合物 ,智能型高分子的分离机理及其在化工分离领域中的应用研究     

影响聚酯切片色泽的因素分析

探讨了影响聚酯切片色泽的因素 ,提出控制PTA质量、催化剂与添加剂种类及含量、生产负荷与真空度、聚酯的结晶度与羧基含量等主要因素 ,生产出色泽均一、晶亮的聚酯切片 ,从而提高聚酯的可纺性及其纤维的色泽     

SMA接枝PHBA侧链液晶高分子的合成与性质

采用溶液缩聚法合成了苯乙烯－马来酸酐共取物接枝聚对羧基苯甲酸侧链液晶高分子,讨论了反应的接枝率和液晶侧链对高聚物热性质的影响。     

聚砜-Al2O3复合膜处理油田含油污水

报导了用Ａｌ２Ｏ３微粒填充到聚砜中制备的复合膜对含油水体进行处理。通过对水通量随操作压力,时间和水样的分析可知,该复合膜对含油污水有很好的处理效果。在相同的操作压力下,ＰＳＦ与Ａｌ２Ｏ３质量比为１０：５的复合膜的水渗透通量最大,并且随着时间的进行该复合膜的水渗透通量下降的最慢;     

浅谈CNG母站节能降耗问题

目前我国CMG汽车保有量和CNG加气站数量在持续增加,但在安全管理和节能降耗方面的技术研究相对落后,CNG加气站各种问题日渐凸现,本文简单介绍CNG加气站工作流程,并针对CNG加气站的现有设备及日常运行情况,从各个方面提出合理性建议,以便于解决CNG母站在节能降耗方面存在的问题。     

阴-阳离子有机坡缕石对对苯二酚的吸附行为

采用微波辅助法制备了一系列阴-阳离子表面活性剂改性坡缕石,研究了改性坡缕石对水中对苯二酚的吸附.结果表明,经阴-阳离子表面活性剂改性后的坡缕石对对苯二酚的吸附能力远大于坡缕石原土及阳离子表面活性剂改性的坡缕石.改性坡缕石对对苯二酚的最大吸附量为137.5 mg/g.等温吸附过程可以用Langmuir方程进行较好拟合,热力学函数计算表明,吸附剂对对苯二酚的吸附是自发的放热过程,吸附热和熵变分别为-93.582 kJ/mol和-299.32 J/mol·K,吸附自由能随温度的升高而增加.     

The study on poly(ether sulfone) modified cyanate ester resin and epoxy resin cocuring blends

Poly(ether sulfone) terminated with phenolic hydroxyl groups modified cyanate ester resin and epoxy resin cocuring blends were investigated by differential scanning calorimetry, Fourier transform infrared spectroscopy, scanning electron microscopy, rheometry, and mechanical properties measurement. The results suggested that poly (ether sulfone) (PES) could accelerate the polycyclotrimerization reaction of cyanate ester and cocuring processes between cyanate ester and epoxy of modified blends because of the presence of phenolic hydroxyl groups at the end of the PES molecules. It was found that the evolution of the morphologies and complex viscosities of the modified blends sensitive to molecular weight and content of PES, the tensile strength and elongation at break of the modified blends were correlated with the morphologies of modified blends. Moreover, the evolution of complex viscosities of the modified blends also showed an exponential growth at the early stage of phase separation, which demonstrated experimentally that the coarsening processes of droplets of bisphenol‐A dicyanate and diglycidyl ether of bisphenol A and the final morphologies obtained in the blends modified with PES were affected by viscoelastic behavior. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Study on the creep behavior of polypropylene

The creep behavior and creep failure law of polypropylene (PP) were investigated by using a multifunctional stress‐aging testing machine under different aging environmental conditions (temperature, UV, and stress). Photoinduced changes in samples were studied using gel permeation chromatography and X‐ray photoelectron spectrometer. Surface morphologies were also observed by scanning electron microscopy. It was found that there is a critical failure strain (ε_crit) for PP during the creep course. Once the creep deformation exceeds the ε_crit, creep failure of PP takes place very rapidly. The value of ε_crit is independent of the tensile stress and UV irradiation, whereas it is only affected by the temperature and the nature of the PP, such as molecular weight and molecular structure. With increasing temperature, the value of ε_crit increases gradually. In addition, the creep rate of PP increases rapidly with increasing tensile stress and temperature as well as under irradiation with UV light. This study may provide a new way to predict the service lifetime of PP. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers