偏苯三酸酐酰氯的合成及其氯质量分数的快速测定

以氯化亚砜及偏苯三酸酐为原料合成了偏苯三酸酐酰氯。考察了试剂、醇解时间、硝酸用量及氢氧化钠浓度等条件对氯质量分数的影响,并用容量法测定了氯质量分数。适宜的合成条件为:反应温度70℃,反应时间10 h,经萃取,重结晶得产物,收率95．1%。并用熔点法和红外光谱对目标化合物结构进行了确证。     

泡沫稳定剂对丙烯酸酯胶黏剂发泡体系的影响

阐述了泡沫体系的稳泡机理,采用物理发泡方法,研究了不同种类、含量的泡沫稳定剂对丙烯酸酯胶黏剂发泡体系的影响。结果表明,有机硅AK8805对该体系的效果最好。当发泡剂含量为15%、有机硅AK8805的含量为9%时,该发泡体系的发泡倍率可达到43.6 ml.g-1。     

EDTA络合法制备Ni-Zn铁氧体及其磁学性质(英文)

以金属硝酸盐为原料,通过乙二胺四乙酸(EDTA)络合法制备了尖晶石型Ni1-xZnxFe2O4(x=0.0-0.7)晶体。通过TG-DTA考察了制备过程,采用XRD、FT-IR、SEM和VSM等对产物进行了表征,研究了热处理温度和Zn取代量对晶型结构和磁学性质的影响。同传统的固相法相比(1300℃/20h),制备单相Ni-Zn铁氧体所需的焙烧温度降至700℃,焙烧时间缩短至2h。随着Zn取代量的增加,晶胞参数递增,而矫顽力(Hc)和居里温度(Tc)逐渐下降。饱和磁化强度(Ms)随Zn取代量呈先递增至x=0.4后再逐渐下降。在1.5MHz的交变磁场中,所制粒子的感应温度接近设计的居里温度,能够适于感应加热的应用。     

Preparation, characterization and luminescence of Sm3+ or Eu3+ doped Sr2CeO4 by a modified sol-gel method

Superfine Sr2CeO4:RE3+ (RE=Eu, Sm) phosphors were synthesized at relatively low temperature by a modified sol-gel method using nitrates as raw materials, ethylenediaminetetraacetic acid (EDTA) as complexing agent. Single phase phosphors could be obtained at calcination temperature above 800 °C and pH value higher than 6.4 of initial solution. The as-prepared powders consisted of uniform crotch-like grains. The preparation process was monitored by thermogravimetric and differential thermal analysis (TG-DTA) and Raman spectra. The obtained products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS) and photoluminescence. Photoluminescence study indicated that strong energy transfer occurred between Eu3+/Sm3+ and host. The Sr2CeO4:RE3+ emission could be tuned from blue to white and red light by varying the concentration of RE3+. The strong emission and controllable light color are suitable for applications in advanced lighting and displaying fields.     

常温固化聚丙烯酸酯胶粘剂

分析了丙烯酸酯的反应特点,介绍了第一、二、三代丙烯酸酯胶粘剂、丙烯酸酯厌氧胶粘剂、丙烯酸压敏胶粘剂以及α-氰基丙烯酸酯胶粘剂这几种常温固化丙烯酸酯胶粘剂的组分、应用及其研究进展.     

室温快固型双组分环氧丙烯酸酯胶粘剂性能研究

以环氧树脂和丙烯酸为基本原料,合成环氧丙烯酸酯,采用氧化还原的引发方式,用环氧丙烯酸酯及其他活性单体和添加剂制备出一种室温快固型双组分胶粘剂。研究了氧化剂、还原剂以及温度和放置时间对环氧丙烯酸酯胶粘剂性能的影响。     

Polyurethane grafted attapulgite as novel fillers for nylon 6 nanocomposites

Attapulgite fibers were modified by polyurethane, forming polyurethane grafted attapulgite (AT-PU), which was confirmed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Nylon 6/AT-PU nanocomposites of different modified attapulgite loadings were prepared by melt blending in a twin screw extruder. Scanning electron microscopy (SEM) observation on the fracture surfaces of the nanocomposites showed not only a uniform dispersion of AT-PU but ...     

上下行通风对东峡矿大倾角采空区自燃危险区域的影响

以东峡煤矿37220-1大倾角采空区为研究对象,聚焦采空区自燃"三带"划分问题,运用GAMBIT和FLUENT这2种软件,建立了数值模拟模型,对上下行通风条件下采空区氧气浓度分布进行了模拟研究,并根据模拟结果绘制出不同高度条件下采空区自燃"三带"分布情况。模拟结果显示:大倾角采空区自燃"三带"在分布上呈三维立体状态;采用上行通风时,采空区氧化带宽度较下行通风时大;随着距底板高度的增大,采空区氧化带范围以下顺槽尾部为圆心逐渐缩小。     

4-甲基丙烯酸氧乙基偏苯三酸酐酯的合成

用酰氯法在70℃下通过分批加料,反应12 h合成偏苯三酸酐酰氯(TMAC),研究了其反应机理,通过测定其氯含量证明产率达95%以上;并进一步在冰浴中合成出了4-甲基丙烯酸氧乙基偏苯三酸酐酯(4-META),通过对吡啶、溶剂用量及反应时间的考察,得出最佳反应条件n(偏苯三酸酐酰氯)∶n(甲基丙烯酸羟乙酯)∶n(吡啶)=1∶1∶1.05,测得其熔点是95℃,并用IR分析了物质结构表征。     

齿科光固化胶粘剂的研究进展

介绍了齿科光固化胶粘剂的特征、固化机理和组成,重点阐述了复合树脂为基质胶粘剂的发展,并对齿科光固化胶粘剂的研究趋势作了展望。