Synthesis and Characterization of Titania and Rare Earth Doped Titania Nanoparticles by Sol-gel Process

Titania sol has been prepared by the sol-gel process with Ti（OC4H9）4, as precursor. TiO2 gel was obtained through hydrolysis and condensation process. Rare earth such as La2O3, CeO2 and Gd2O3 were introduced into the nanostructure TiO2. After TiO2 and rare earth doped TiO2 powders were calcined at 400℃, 500℃, 600℃, 700℃ and 800℃ respectively, the characteristic analyses of the TiO2 samples were studied by UV-VIS, XRD and TEM etc. It was found that there are some stringer absorption peaks at 200 - 325 nm. The rare earth doping can increase the phase transition temperature convertin8 anatase phase into rutile phase, can decrease the grain size of TiO2particles and can improve the ann-UV capacity of the coating fabrics.     

酚酞型聚芳醚砜/蛭石复合膜的制备与性能

以十六烷基三甲基溴化铵(HDTMA+Br-)为插层剂,对蛭石(VMT)插层,制备有机柱撑蛭石(OVMT).XRD分析表明:经HDTMA+Br-插层后,OVMT的层间距由柱撑前的1.46nm增大到4.70nm,柱撑效果明显.通过浸没沉淀相转化法制备酚酞型聚芳醚砜(PES-C)/OVMT复合膜,研究了蛭石的加入量对PES-C/OVMT复合膜隔热性能、热稳定性能和机械性能的影响规律,结果表明:5%的蛭石添加量即可有效提高PES-C/OVMT复合膜的隔热性能、热稳定性能和机械性能.     

Bioscouring Knitted Cotton Fabric with an Experimental Pectate Lyase

An experimental pectate lyase enzyme was used toscour knitted cotton fabric and the emphasis was on pectinremoval. Using an enzyme dosage of 0.2 g/L at temperature55℃ and pH 6.35 for 30 rain, good scouring properties wereobtained. When appropriate concentrations of 1 - HydroxyEthylidene- 1, 1 - Diphosphonic Acid(HEDP) and CaCl2were added, the percentage pectin removal improvedsignificantly.     

热防护纺织材料隔热性能的数值模拟

建立了一维织物传热模型,在此基础上利用ANSYS软件对热防护材料的隔热性能进行数值模拟和预测,并用PBI(Polybenzimidazoles)织物与PSA(Polysulfonamide)织物在不同热流密度下的热防护实验结果对模型的有效性进行了验证,结果显示数值模拟结果与实验结果的相对误差在5%以内.     

港口配煤状况探讨

本文介绍并分析了目前国内外港口的配煤的意义和现状以及以具体煤炭中转码头配煤工艺设计为例对配煤方式和要求进行分析和探讨,并提出了今后的港口配煤的设想和建议     

大型硬质合金顶锤裂纹萌生及断裂行为研究

针对顶锤在长期加载卸载过程中,易出现裂锤、塌锤等导致结构失效的问题,以Ф240大型顶锤为研究对象,通过有限元软件计算分析超大型顶锤在工作过程中的敏感区域应力分布,并与同工况下小型顶锤的应力情况作对比研究,从应力方面对超大型顶锤易于破损的原因进行了分析。利用扫描电子显微镜进行元素面分布扫描分析,研究了破损顶锤的断口形貌和化学成分等。研究结果表明：顶锤斜面承受拉应力和剪切应力大于芯部,裂纹源易在斜面处产生,裂纹主要沿着WC/WC界面扩展,高压砧面由于温度高于斜面,其断口氧化和Co相析出堆积程度更高。     

Na~+对氢氧化镁晶体在纤维素膜上原位生长的影响及应用

采用氨水和氯化镁为原料制备氢氧化镁晶体,在自制的纤维素膜上进行原位生长,对纤维素膜进行羧基改性,使纤维素膜表面产生具有能与氢氧化镁结合的活性结合点,控制氯化钠的添加,研究Na+对氢氧化镁晶体生长的影响.利用扫描电子显微镜(SEM)观察氢氧化镁晶体的表面形态;X-射线衍射(XRD)分析其晶型结构;电感耦合等离子体(ICP)分析纤维素膜上镁元素的含量.研究结果表明,添加氯化钠,纤维素膜上得到棒状氢氧化镁晶体;不添加氯化钠,纤维素膜上得到片状的氢氧化镁晶体;生长有棒状氢氧化镁晶体的纤维素膜上镁元素含量比片状氢氧化镁晶体高.另外,生长有氢氧化镁晶体后纤维素膜的热稳定性有所提高,且生长有棒状氢氧化镁晶体的纤维素膜比生长有片状氢氧化镁晶体纤维素膜的热稳定性更好.     

Measurement of the Average Molecular Weight of Cotton Cellulose Crosslinked by a Polycarboxylic Acid at Different pH Using Multiple Angle Light Scattering Photometer in a DMAc/LiCl Solvent System

Durable press finishing of cotton fabrics with polycarboxylic acid increases fabric wrinkle-resistance at the expense of its mechanical strength. Severe tensile strength loss is the major disadvantage for wrinkle resistant cotton fabrics. Tensile strength loss of cotton fabric crosslinked by a polycarboxylic acid can be attributed to depolymerization and crosslink of cellulose molecules. Measurement of the molecular weight of cotton fabric before and after crosslinked by polycarboxylic acids can offer a possibility of direct understanding of the depolymerization. In this research, a multiple angle laser light scattering photometer was used to determine the absolute molecular weight of cotton fabric treated with BTCA at different pH and then hydrolyzed with 0.5 M NaOH solution at 50℃ for 144 h. The results indicate that average molecular weights of cotton fabric treated with polycarboxylic acids at different pH are almost the same.     

填充剂改性羧甲基纤维素对聚氨酯(PU)膜性能的影响

聚氨酯合成革生产中,为了降低成本,改善性能,经常在涂层浆中添加填充剂纤维素粉末等。为了提高聚氨酯合成革的吸湿性,本文用改性羧甲基纤维素代替纤维素粉末作填充剂,并对分别添有纤维素粉末和改性羧甲基纤维素的聚氨酯膜的性能进行了比较。     

An Investigation on Properties of PU/PVC Blended Porous Films

Structure and properties of PU/PVC blended film are fnvestlgated in the work. The experimental results show that the PU/PVC blended film has a multiplex poroslty strueture, and their structure and properties vary with PVC content in the blended film. The correlation and regresslon between the properties and PVC content are listed in the paper.