An apparatus for measuring solubilities of gases in liquids at elevated temperatures and pressures has been constructed. Using this apparatus, the slubilities of N_2 and CO_2 in some solvents have been determined in t...An apparatus for measuring solubilities of gases in liquids at elevated temperatures and pressures has been constructed. Using this apparatus, the slubilities of N_2 and CO_2 in some solvents have been determined in the temperature range between 20 and 230℃, and at pressures up to 130 atm. The experimental results obtained generally agree well with literature values. It is shown that this apparatus is reliable; attainment of equilibria needs only about 5 hours; precision of the measure- ments is ±0.2%.展开更多
The electron donor-acceptor(EDA)association constants for the reaction of poly(N- vinylcarbazole)(PVK)samples,prepared under three conditions respectively,or their model compound, N-ethenylcarbazole(NECA),as a donor,a...The electron donor-acceptor(EDA)association constants for the reaction of poly(N- vinylcarbazole)(PVK)samples,prepared under three conditions respectively,or their model compound, N-ethenylcarbazole(NECA),as a donor,and polynitrofluotenone as an acceptor and the molar ab- sorption coefficients of their products have been determined.By analysis of ~1H NMR of PVK quan- titatively,the isotactic sequence's percentage X_1 is estimated.The association constants K may be given byK=K_1X_1+K_2X_2,where the subscripts 1 and 2 denote the isotactic and syndiotactic sequence of the polymer respectively.From the principle of spectral analyses has been deduced the following relationship:K_ε=K_1X_16_1ε_1+K_2X_2ε_2,and estimated the values for K_1,K_2,ε_1 and ε_2,where e is the molar absorption coefficient.展开更多
文摘An apparatus for measuring solubilities of gases in liquids at elevated temperatures and pressures has been constructed. Using this apparatus, the slubilities of N_2 and CO_2 in some solvents have been determined in the temperature range between 20 and 230℃, and at pressures up to 130 atm. The experimental results obtained generally agree well with literature values. It is shown that this apparatus is reliable; attainment of equilibria needs only about 5 hours; precision of the measure- ments is ±0.2%.
文摘The electron donor-acceptor(EDA)association constants for the reaction of poly(N- vinylcarbazole)(PVK)samples,prepared under three conditions respectively,or their model compound, N-ethenylcarbazole(NECA),as a donor,and polynitrofluotenone as an acceptor and the molar ab- sorption coefficients of their products have been determined.By analysis of ~1H NMR of PVK quan- titatively,the isotactic sequence's percentage X_1 is estimated.The association constants K may be given byK=K_1X_1+K_2X_2,where the subscripts 1 and 2 denote the isotactic and syndiotactic sequence of the polymer respectively.From the principle of spectral analyses has been deduced the following relationship:K_ε=K_1X_16_1ε_1+K_2X_2ε_2,and estimated the values for K_1,K_2,ε_1 and ε_2,where e is the molar absorption coefficient.
