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1.
D. A. Topchiev Yu. A. Malkanduev N. N. Kaptsov V. D. Oppengeim V. A. Kabanov 《Russian Chemical Bulletin》1988,37(4):654-656
1. | Studies of the kinetics of radical polymerization of DAC in aqueous solutions in conditions of deep degrees of conversion of monomer into polymer with a combination of dilatometric, calorimetric, and PMR spectral methods showed that in the conditions selected, poly-merization is accompanied by autoacceleration whose onset corresponds to certain values of the concentration of the polymer formed and is in all probability due to the formation of a fluctuation linkage network of the polymer in the reaction solution. |
2. | The quantitative dependence of the values of the characteristic concentrations of the polymer corresponding to the onset of autoacceleration on the degree of polymerization of the polymer formed at the onset of autoacceleration was established. |
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V. V. Nikitenko A. I. Martynenko S. A. Ostrovsky V. V. Rusak V. V. Kryuchkov D. A. Topchiev 《Russian Chemical Bulletin》1993,42(2):378-380
3-Methyl-l-vinylpyrazole (M3VP) and 5-methyl-1-vinylpyrazole (M5VP) were isolated as individual substances by vacuum rectification of their mixture (M3VP: M5VP 60 40). For each of them the kinetics of free-radical polymerization in MeOH were measured at low conversions. In both cases the rate of polymerization is proportional to 0.5 order with respect to the initiator (AIBN) concentration. On the other hand, a first order of reaction with respect to monomer concentration is observed only when the latter is relatively low (3M). At higher initial concentrations of monomers the order of reaction becomes less than unity. The overall rate of polymerization for M5VP was higher than for M3VP, whereas the initiation rate remained constant in the whole range of monomer concentrations and did not depend on the exact structure of the monomer. The difference in the rates of polymerization observed for M3VP and M5VP is probably connected with the difference in the key parameterk
p/k
t
1/2
for each of the two isomers. It is concluded that the correct kinetic information about homo- and co-polymerization of M3VP and M5VP cannot be obtained without their adequate separation.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 413–415, February, 1993. 相似文献
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N. S. Nametkin A. V. Topchiev T. I. Chernysheva L. I. Kartasheva 《Russian Chemical Bulletin》1963,12(4):586-590
Summary Some organosilicon compounds containing siloxane-carbon, silthiane-carbon, and silazane-carbon groupings in their main chains were synthesized, and their physical and chemical properties were determined. 相似文献
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A. V. Topchiev A. I. Petel'man V. I. Smetanyuk B. A. Krentsel' 《Russian Chemical Bulletin》1959,8(7):1301-1303
Summary The yield of highly crystalline polypropylene was considerably increased by polymerization of propylene on a chromium oxide catalyst in the presence of small amounts of i-(C4H9)3Al. 相似文献
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Feasibility in principle has been demonstrated for obtaining hydrogels with controlled parameters of the three-dimensional network by copolymerization of N,N-methylenebisacrylamine with macromolecules of poly-N,N-diallyl-N,N-dimethylammonium chloride containing terminal double bonds, i.e., with macromonomers of N,N-diallyl-N,N-dimethylammonium chloride. The hydrogels that are obtained have high anion-exchange capacities.A. V. Topchiev Institute of Petrochemical Synthesis, Academy of Sciences of the USSR, Moscow 117912. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 4, pp. 851–854, April, 1992. 相似文献
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