A phosphrous-containing poly（aryl ether ketone） was synthesized derived from bisphenol-A and bis[4-（4- fluorobenzoyl）phenyl] phenyl phosphine oxide （FPPPO） by nucleophilic substitution reaction. The structure of...A phosphrous-containing poly（aryl ether ketone） was synthesized derived from bisphenol-A and bis[4-（4- fluorobenzoyl）phenyl] phenyl phosphine oxide （FPPPO） by nucleophilic substitution reaction. The structure of the polymer was characterized by FT-IR, ^1H-NMR and ^31p-NMR. The thermal property of the PAEK was measured by DSC and TGA. The glass transition temperature （Tg） of the polymer was 205℃, and the 5% weight loss temperature under nitrogen was 475℃. Good solubility of the polymer in organic solvents, such as N-methylpyrrolidone, dimethylformamide, dimethylacetamide, dimethylsulfoxide and chloroalkanes was observed, flexible film was obtained from the polymer＇s CH2Cl2 solution. The limiting oxygen index （LOI） of the PAEK was 40, which indicated that organic phosphorus moiety can offer good flame retardant property to the polymer.展开更多
Two novel silver（I） complexes [Ag（DPEphos）（dppe）]Cl O4（1） and [Ag（DPEphos）-（dppe）]SCN（2）（DPEphos = bis[2-（diphenylphosphino）phenyl]ether, dppe = bis（diphenylphosphino）ethane） are synthesized and ch...Two novel silver（I） complexes [Ag（DPEphos）（dppe）]Cl O4（1） and [Ag（DPEphos）-（dppe）]SCN（2）（DPEphos = bis[2-（diphenylphosphino）phenyl]ether, dppe = bis（diphenylphosphino）ethane） are synthesized and characterized by IR, 1H/31 P NMR spectroscopy and fluorescence spectra. Complex 1 crystallizes in monoclinic, space group P21/c with a = 14.8821（12）, b = 12.6620（11）, c = 36.025（3） ？, β = 112.633（2）°, V = 6265.7（9） ？3, C62H52 Cl O5P4Ag, Mr = 1144.24, Z = 4, Dc = 1.213 g/cm3, F（000） = 2352, μ = 0.510 mm-1, the final R = 0.0616 and w R = 0.1192 for 4003 observed reflections（I 〉 2σ（I））. Complex 2 crystallizes in monoclinic, space group P21/c with a = 14.9021（13）, b = 12.6100（11）, c = 35.920（3） A, β = 112.852（2）°, V = 6220.2（9） A3, C63H52NOP4 SAg, Mr = 1102.87, Z = 4, Dc = 1.178 g/cm3, F（000） = 2272, μ = 0.498 mm-1, the final R = 0.0912 and w R = 0.1706 for 3287 observed reflections（I 〉 2σ（I））. In mono-nuclear complexes 1 and 2, the Ag（I） atom is chelated by DPEphos and dppe ligand. In the 31 P NMR spectra, there are splitting signals（doublets or triplets） which can be attributed to the coupling of the 107,109Ag–31P（from DPEphos or dppe ligand）. All the emission peaks of these complexes are attributed to ligand-centered（π-π＊） transitions.展开更多
Aging of a solid composite propellant containing HTPB/AP/AL was performed in order to validate the conformance of the accelerated aging data to the Arrhenius law. The main objective of the work was to examine the infl...Aging of a solid composite propellant containing HTPB/AP/AL was performed in order to validate the conformance of the accelerated aging data to the Arrhenius law. The main objective of the work was to examine the influence of the aziridine bonding agents family on the propellant aging. Aging of the prepared propellant samples was conducted as follows: 1. Four samples, one free of bonding agents, and three containing aziridine based bonding agents MAPO,HX-752, MAT4 were aged at 65°C. 2. Another four samples based on HX-752, MAT4 with different curing agents were aged at 65°C. The measured mechanical properties of the free bonding agent propellant samples were very far from the specifications and this illustrates the importance of the bonding agents in both the preparation and the aging phases.The prepared bonding agent 'MAT4' gave remarkable improvements of the mechanical properties comparing with HX-752 and MAPO. The aziridine bonding agents family inhibited the rate of decomposition of the propellant during the aging periods and supported the propellant matrix against decomposition at the elevate temperatures. Using of HMDI as curing agent gave slight better mechanical properties to the IPDI.展开更多
基金This work was supported by the National Natural Science Foundation of China(No.50203008).
文摘A phosphrous-containing poly（aryl ether ketone） was synthesized derived from bisphenol-A and bis[4-（4- fluorobenzoyl）phenyl] phenyl phosphine oxide （FPPPO） by nucleophilic substitution reaction. The structure of the polymer was characterized by FT-IR, ^1H-NMR and ^31p-NMR. The thermal property of the PAEK was measured by DSC and TGA. The glass transition temperature （Tg） of the polymer was 205℃, and the 5% weight loss temperature under nitrogen was 475℃. Good solubility of the polymer in organic solvents, such as N-methylpyrrolidone, dimethylformamide, dimethylacetamide, dimethylsulfoxide and chloroalkanes was observed, flexible film was obtained from the polymer＇s CH2Cl2 solution. The limiting oxygen index （LOI） of the PAEK was 40, which indicated that organic phosphorus moiety can offer good flame retardant property to the polymer.
基金supported by the National Natural Science Foundation of China(Nos.21171119 and 81573822)the National High Technology Research and Development Program 863 of China(No.2012AA063201)+1 种基金the Technology Foundation for Selected Overseas Chinese,the Beijing Municipal Education Commission(KM201510028006)the Scientific Research Base Development Program of the Beijing Municipal Commission of Education
文摘Two novel silver（I） complexes [Ag（DPEphos）（dppe）]Cl O4（1） and [Ag（DPEphos）-（dppe）]SCN（2）（DPEphos = bis[2-（diphenylphosphino）phenyl]ether, dppe = bis（diphenylphosphino）ethane） are synthesized and characterized by IR, 1H/31 P NMR spectroscopy and fluorescence spectra. Complex 1 crystallizes in monoclinic, space group P21/c with a = 14.8821（12）, b = 12.6620（11）, c = 36.025（3） ？, β = 112.633（2）°, V = 6265.7（9） ？3, C62H52 Cl O5P4Ag, Mr = 1144.24, Z = 4, Dc = 1.213 g/cm3, F（000） = 2352, μ = 0.510 mm-1, the final R = 0.0616 and w R = 0.1192 for 4003 observed reflections（I 〉 2σ（I））. Complex 2 crystallizes in monoclinic, space group P21/c with a = 14.9021（13）, b = 12.6100（11）, c = 35.920（3） A, β = 112.852（2）°, V = 6220.2（9） A3, C63H52NOP4 SAg, Mr = 1102.87, Z = 4, Dc = 1.178 g/cm3, F（000） = 2272, μ = 0.498 mm-1, the final R = 0.0912 and w R = 0.1706 for 3287 observed reflections（I 〉 2σ（I））. In mono-nuclear complexes 1 and 2, the Ag（I） atom is chelated by DPEphos and dppe ligand. In the 31 P NMR spectra, there are splitting signals（doublets or triplets） which can be attributed to the coupling of the 107,109Ag–31P（from DPEphos or dppe ligand）. All the emission peaks of these complexes are attributed to ligand-centered（π-π＊） transitions.
文摘Aging of a solid composite propellant containing HTPB/AP/AL was performed in order to validate the conformance of the accelerated aging data to the Arrhenius law. The main objective of the work was to examine the influence of the aziridine bonding agents family on the propellant aging. Aging of the prepared propellant samples was conducted as follows: 1. Four samples, one free of bonding agents, and three containing aziridine based bonding agents MAPO,HX-752, MAT4 were aged at 65°C. 2. Another four samples based on HX-752, MAT4 with different curing agents were aged at 65°C. The measured mechanical properties of the free bonding agent propellant samples were very far from the specifications and this illustrates the importance of the bonding agents in both the preparation and the aging phases.The prepared bonding agent 'MAT4' gave remarkable improvements of the mechanical properties comparing with HX-752 and MAPO. The aziridine bonding agents family inhibited the rate of decomposition of the propellant during the aging periods and supported the propellant matrix against decomposition at the elevate temperatures. Using of HMDI as curing agent gave slight better mechanical properties to the IPDI.
