排序方式: 共有159条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
75.
2-氨基乙基-二(3-氨基丙基)胺的合成工艺研究 总被引:9,自引:0,他引:9
利用氨基乙腈及丙烯腈的亲核加成、氢化反应合成了一种新的不等臂有机多胺化合物 2 -氨基乙基 -二 (3-氨基丙基 )胺。研究了不同工艺条件对反应的影响 ,最佳工艺条件为 :n(丙烯腈 )∶n(氨基乙腈 ) =2 .8~ 3 .0 ,加成温度为 70~ 75℃ ,加成反应时间为 50~ 60h ,催化反应采用复合催化剂 ,m(溶剂 )∶m(物料 )≈ 1 0。两步反应的收率分别为 81 .6 %和 71 .6 % ,用多种谱学手段表征确证了该化合物及其中间产物 相似文献
76.
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 ... 相似文献
77.
78.
79.
80.
A facile approach to preparing well-dispersed nanocrystals of BaCeO3 was developed by a combination of solvothermal and annealing processes. The precursor consisted of amorphous BaCO3 and CeO2, and the conversion of the precursor to crystalline BafeO3 nanocrystals occurred upon heat treatment at a relatively low temperature. The as-processed BaCeO3 had an orthorhombic structure and the average size of such crystals was approximately 80 nm. The obtained products were characterized by Fourier Transform Infrared (FT-IR), X-Ray Diffraction (XRD), Laser Raman Spectroscopy (LRS), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Spectrometry (EDS), and Transmission Electron Microscopy (TEM). This preparation process could also be used to synthesize doped barium cerate complex oxides Bafe0.95M0.05O3-δ (M=Y, Nd, Gd, and Sm). 相似文献