A new method has recently developed,the solution sampling method(SMM),to quantify the binary rubber blends of NR/BR by pyrolysis/gas chromatography/mass spectrometry(PY/GC/MS).The rubbers were swelled in the cyclohexa...A new method has recently developed,the solution sampling method(SMM),to quantify the binary rubber blends of NR/BR by pyrolysis/gas chromatography/mass spectrometry(PY/GC/MS).The rubbers were swelled in the cyclohexane,using the hydrogen peroxide solution to destroy the cross-linked structure of the rubbers and then the rubbers can be sloved in the cyclohexane.The rubber solution was applied to the spiral section of the injector.The solvent was evaporated depositing the rubber on the spiral section,and the rubber was prolyzed at 550℃.Then calculate the weight percentage by the characteristic peak area ratio.One test rubber,NR/BR where the weight percentage of NR is 50% was calculated.The error was 5.64%.展开更多
BaFe12O19 fibers was prepared via an aqueous sol-gel process using Fe（OH）（HCOO）2 synthesized in laboratory and Ba（CH3COO）2 as the original materials and citrate as the chelate. The rheological behaviour of spinn...BaFe12O19 fibers was prepared via an aqueous sol-gel process using Fe（OH）（HCOO）2 synthesized in laboratory and Ba（CH3COO）2 as the original materials and citrate as the chelate. The rheological behaviour of spinnable sol was characterized on rheometer, and the development of gel fibers to barium ferrite fibers was studied by IR, TG and XRD. Morphology observation of the fibers was given on SEM, and the diameter of the obtained fibers was between 5 and 10 um corresponding to different additives. The additives affected the surface tension of the precursor sol which had close relation to the microstructure of fibers. Sucrose and hydroxyethylic cellulose could improve the surface tension while diethanolamine and hexadecylamine reduce that of the decylamine as an additive, well-structured BaFe12O19 precursor sol. And using diethanolamine or hexafibers could be obtained.展开更多
文摘A new method has recently developed,the solution sampling method(SMM),to quantify the binary rubber blends of NR/BR by pyrolysis/gas chromatography/mass spectrometry(PY/GC/MS).The rubbers were swelled in the cyclohexane,using the hydrogen peroxide solution to destroy the cross-linked structure of the rubbers and then the rubbers can be sloved in the cyclohexane.The rubber solution was applied to the spiral section of the injector.The solvent was evaporated depositing the rubber on the spiral section,and the rubber was prolyzed at 550℃.Then calculate the weight percentage by the characteristic peak area ratio.One test rubber,NR/BR where the weight percentage of NR is 50% was calculated.The error was 5.64%.
基金Supported by National Natural Science Foundation of China(No.50506020)Natural Science Foundation of Tianjin(No.043605211)Young Teacher Foundation of Tianjin University(No.5110103)
文摘BaFe12O19 fibers was prepared via an aqueous sol-gel process using Fe（OH）（HCOO）2 synthesized in laboratory and Ba（CH3COO）2 as the original materials and citrate as the chelate. The rheological behaviour of spinnable sol was characterized on rheometer, and the development of gel fibers to barium ferrite fibers was studied by IR, TG and XRD. Morphology observation of the fibers was given on SEM, and the diameter of the obtained fibers was between 5 and 10 um corresponding to different additives. The additives affected the surface tension of the precursor sol which had close relation to the microstructure of fibers. Sucrose and hydroxyethylic cellulose could improve the surface tension while diethanolamine and hexadecylamine reduce that of the decylamine as an additive, well-structured BaFe12O19 precursor sol. And using diethanolamine or hexafibers could be obtained.
