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21.
22.
Xianran Xing Jun Luo Guirong Liu Lijie Qiao 《Journal of the American Ceramic Society》2006,89(3):1125-1128
A multi-component substitution of Co and Ni was incorporated into ZnTiO3 to form pure hexagonal Zn1− x (Co1/2 Ni1/2 ) x TiO3 ( x =0,0.8,0.9,1.0) dielectric ceramic powders by a modified sol–gel route, following heat treatments at 600°C for 3 h and at 800°C for 6 h. Differential scanning calorimetry measurements revealed that the order of increasing thermal stability of solid solution compound Zn1− x (Co1/2 Ni1/2 ) x TiO3 was ZnTiO3 (945°C), Zn0.1 Ni0.9 TiO3 (1346°C), Zn0.1 (Co1/2 Ni1/2 )0.9 TiO3 (1390°C), and Zn0.1 Co0.9 TiO3 (>1400°C). Both the dielectric constant and loss tangent reached a maximum at x =0.8 and then decreased with solubility, x , and measurement frequency. 相似文献
23.
合成丁酸异戊酯的新方法 总被引:3,自引:0,他引:3
采用超强酸代替浓硫酸作催化剂,对丁酸异戊酯合成反应进行了研究,讨论了影响收率的多种因素,在最佳条件下,酯化反应时间短,催化剂可以重复使用,丁酸异戊酯收率达到98%。 相似文献
24.
The morphology and mechanical properties of PVC/SMA‐g‐PA6 blends were investigated in this paper. Graft to polymer SMA‐g‐PA6 was prepared via a solution graft reaction between SMA and PA6. FTIR test evidences the occurrence of the graft reaction between SMA and PA6. DSC analysis shows that SMA‐g‐PA6 has a lower melting point of 187°C, which may result in a decrease in crystallinity of PA6 and thus enable efficient blending of SMA‐g‐PA6 and PVC. Compatibilization was evidenced by the dramatic increase in mechanical properties, the smaller particle size and finer dispersion of PA6 in PVC matrix, and, further, a cocontinuous morphology at 16 wt % SMA‐g‐PA6 content. SMA‐g‐PA6 from the solution graft reaction can toughen and reinforce PVC material. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 432–439, 2004 相似文献
25.
26.
以石灰石为原料,利用管式气体分散式反应器新工艺制备出了粒径30~70nm的碳酸钙粉体。采用X射线衍射(XRD)、扫描电镜(SEM)、粒度分布仪及红外光谱仪(Fr-IR)等测试手段,对产品的物相、形貌和粒度分布进行了表征。X射线衍射表明产物为六方晶系方解石型碳酸钙并且产品结晶性能良好;扫描电镜及粒度分析表明粒度大小均匀、分散性良好;红外光谱表明改性后硬脂酸钠已吸附在碳酸钙表面,碳酸钙颗粒基本呈单分散状态。管式气体分散式反应器制备纳米碳酸钙粉体的优点是工艺简单,操作容易,原料易得,生产的产品粒径小,粒度分布窄,易于工业化生产。 相似文献
27.
Velocity measurements and flow field characteristic analyses in a turbo air classifier 总被引:2,自引:0,他引:2
Turbo air classifier is one of the most widely used powder classification equipment. The rotor cage as a rotary component can create a forced centrifugal field, so it is a key part for turbo air classifier. In order to investigate the effect of structural variations of the rotor cage on flow field characteristics, three dimensional velocity measurements of the annular region in a turbo air classifier equipped with two different rotor cage bottom plates (A and B type) are performed by laser Doppler velocimeter (LDV). It is found that the different bottom plates have different axial and tangential velocity distributions in the annular region. However, the structural variations of the rotor cage have hardly any effect on the radial velocity. Based on the classification principle, the relation between the classification performance and the flow field characteristics is investigated in great detail.The results of the flow field measurements were tested by the classification experiments carried out with cement raw meal and ground calcium carbonate. The results demonstrate that B type bottom plate can realize the production of narrow particle size distributions, so it is more favorable for classification than A type bottom plate. Classification experiment results are in good agreement with the results of the flow field measurements. 相似文献
28.
Water molecules adsorbed on a double-walled carbon nanotube (DWCNT) serve as charge trapping centers when present in low density and as electron donors when present in high density. There is a discontinuous change between the low- and high-density regions. H2O molecules are apt to be adsorbed on the outer surface of DWCNTs, and in this case the electrical transport properties are extremely sensitive to environment, which suggests that DWCNTs are hole doped and act as an electric dipole with the inner tube. 相似文献
29.
A series of new polyamides 3a–d containing aryl-azo, ether and sulfone groups in the main chain were synthesized from bis[4-(4-aminophenoxy)phenyl sulfone]
1 and several azo aromatic diacyl chlorides 2a–d by the low temperature solution polycondensation technique. FTIR spectroscopy, nuclear magnetic resonance (NMR) and elemental
analyses confirmed the structure of these polymers. Owing to the aryl and amide groups in the main chain, these polymers exhibit
photochromic properties as well as excellent thermal stabilities. The transition temperatures (T
g) are between 242 and 265 °C, and the char yields at 800 °C in nitrogen atmosphere were above 39%. Based on incorporation
of flexible ether linkages and polar sulfone groups, the polyamides show desirable solubility in organic solvents such as
DMAc, N,N-dimethylformamide (DMF), N-methyl-2-pyrroidinone (NMP) and dimethylsulfoxide (DMSO). And it is exemplified that
polyamide containing 2 and 2′ substitutes performed better solubility.
Funded by the National Natural Science Foundation of China (No. 50572081) 相似文献
30.
瓮福磷矿选矿厂精矿仓首次采用网架式地面矿仓,造价低,空间利用率高,设备运行平稳可靠,操作灵活方便,工作环境好。超长梭式胶带布料机的设计也是成功的。 相似文献