Terephthalic acid(PTA) is practically one of the main materials of polyester. Its corresponding solid-liquid equilibrium data will provide essential support for industry design and further theoretical studies. In this...Terephthalic acid(PTA) is practically one of the main materials of polyester. Its corresponding solid-liquid equilibrium data will provide essential support for industry design and further theoretical studies. In this work,solid-liquid equilibriums of terephthalic acid in four solvents, N,N-dimethylformamide, N,N-dimethylacetamide,dimethylsulphoxide and N-methyl-2-ketopyrrolidene, were determined in the temperature range from 293.15 K to 364.6 K by dynamic method. All these data were regressed by λh model, Wilson model and NRTL model, average absolute relative deviations of which are 1.25%, 15.02% and 7.22% respectively. It indicates that λh model is mostsuitable for description of the solid-liquid equilibrium containing PTA.展开更多
The title complex was obtained by reaction of hydrated neodymium(Ⅲ) nitrate with N,N-disalicyclideneethylenediamine in DMSO. The complex [Nd(C_6H_4OHCHNC_2H_4NCHC_6H_4OH)(NO_3)_3(CH_3SOCH_3)] crystallizes in monoclin...The title complex was obtained by reaction of hydrated neodymium(Ⅲ) nitrate with N,N-disalicyclideneethylenediamine in DMSO. The complex [Nd(C_6H_4OHCHNC_2H_4NCHC_6H_4OH)(NO_3)_3(CH_3SOCH_3)] crystallizes in monoclinic system, space group- P2_1/n, a=9.663(2), b=16.610(6),c=16.322(5),β=102.77(2)°,V=2555(3),M_r=676.71,Z=4,Dx=1.759 gcm-3. The coordination number of Nd(Ⅲ) is 9 with the geometry of a monocapped square antiprism.All of coordination atoms are oxygen atoms from three bidentate nitrate groups, two dischiff base molecules and one DMSO molecule.展开更多
Titanium complexes derived from 2,4-di-tert-butyl-6-（（2-（arylsulfinyl）phenylimino）methyl）phenol are designed and synthe- sized. X-ray diffraction studies reveal that the complexes adopt distorted octahedral geom...Titanium complexes derived from 2,4-di-tert-butyl-6-（（2-（arylsulfinyl）phenylimino）methyl）phenol are designed and synthe- sized. X-ray diffraction studies reveal that the complexes adopt distorted octahedral geometry with O（phenol）, N（imine）, and O（sulfoxide） coordinated with titanium. Combined with modified methylaluminoxane（MMAO）, the complexes exhibit moderate to high activity to afford polyethylene even at 120 ℃ under 1 atm ethylene pressure. The complexes also show excellent capability in copolymerization of ethylene with either 1-hexene or norbornene. Results indicate that the introduction of sulfoxide groups could open the space around central metal and favors the insertion of bulky comonomers.展开更多
Various polysulfonamide （PSA） statistical copolymers were synthesized by polycondensation of three aromatic diamines and terephthaloyl chloride. The inherent viscosities of the resulting PSA copolymers range from 1....Various polysulfonamide （PSA） statistical copolymers were synthesized by polycondensation of three aromatic diamines and terephthaloyl chloride. The inherent viscosities of the resulting PSA copolymers range from 1.54 to 1.66 dL/g. The precipitated PSA copolymers with feed content of p-phenylene diamine （PPD） being less than 50% （mole fraction） can be redissolved in N-methyl-2-pryrrolidone （NMP） or N, N-dimethylacetamide （DMAc） with lithium chloride of WLiC1 ： 0.02. All of the PSA copolymers exhibit enhanced tensile strength in comparison with PSA and still maintain excellent thermal stability in either air or nitrogen atmosphere展开更多
基金Supported by China Petroleum & Chemical Corporation(No.200049).
文摘Terephthalic acid(PTA) is practically one of the main materials of polyester. Its corresponding solid-liquid equilibrium data will provide essential support for industry design and further theoretical studies. In this work,solid-liquid equilibriums of terephthalic acid in four solvents, N,N-dimethylformamide, N,N-dimethylacetamide,dimethylsulphoxide and N-methyl-2-ketopyrrolidene, were determined in the temperature range from 293.15 K to 364.6 K by dynamic method. All these data were regressed by λh model, Wilson model and NRTL model, average absolute relative deviations of which are 1.25%, 15.02% and 7.22% respectively. It indicates that λh model is mostsuitable for description of the solid-liquid equilibrium containing PTA.
文摘The title complex was obtained by reaction of hydrated neodymium(Ⅲ) nitrate with N,N-disalicyclideneethylenediamine in DMSO. The complex [Nd(C_6H_4OHCHNC_2H_4NCHC_6H_4OH)(NO_3)_3(CH_3SOCH_3)] crystallizes in monoclinic system, space group- P2_1/n, a=9.663(2), b=16.610(6),c=16.322(5),β=102.77(2)°,V=2555(3),M_r=676.71,Z=4,Dx=1.759 gcm-3. The coordination number of Nd(Ⅲ) is 9 with the geometry of a monocapped square antiprism.All of coordination atoms are oxygen atoms from three bidentate nitrate groups, two dischiff base molecules and one DMSO molecule.
基金supported by the National Natural Sciences Foundation of China (21174159, 21121062)the Science and Technology Commission of Shanghai Municipalitythe Chinese Academy of Sciences
文摘Titanium complexes derived from 2,4-di-tert-butyl-6-（（2-（arylsulfinyl）phenylimino）methyl）phenol are designed and synthe- sized. X-ray diffraction studies reveal that the complexes adopt distorted octahedral geometry with O（phenol）, N（imine）, and O（sulfoxide） coordinated with titanium. Combined with modified methylaluminoxane（MMAO）, the complexes exhibit moderate to high activity to afford polyethylene even at 120 ℃ under 1 atm ethylene pressure. The complexes also show excellent capability in copolymerization of ethylene with either 1-hexene or norbornene. Results indicate that the introduction of sulfoxide groups could open the space around central metal and favors the insertion of bulky comonomers.
基金the National Natural Science Foundation of China (No. 50973059)the Scientific Research Foundation of 2009 Graduate School of Shanghai University
文摘Various polysulfonamide （PSA） statistical copolymers were synthesized by polycondensation of three aromatic diamines and terephthaloyl chloride. The inherent viscosities of the resulting PSA copolymers range from 1.54 to 1.66 dL/g. The precipitated PSA copolymers with feed content of p-phenylene diamine （PPD） being less than 50% （mole fraction） can be redissolved in N-methyl-2-pryrrolidone （NMP） or N, N-dimethylacetamide （DMAc） with lithium chloride of WLiC1 ： 0.02. All of the PSA copolymers exhibit enhanced tensile strength in comparison with PSA and still maintain excellent thermal stability in either air or nitrogen atmosphere
