Three new 1,3-bis（phenylethynyl）disilazanes were synthesized from the reaction of 1,3-dichlorodisilazanes with （phenylethynyl）lithium, and characterized by infrared （IR） spectra, nuclear magnetic resonance （NMR...Three new 1,3-bis（phenylethynyl）disilazanes were synthesized from the reaction of 1,3-dichlorodisilazanes with （phenylethynyl）lithium, and characterized by infrared （IR） spectra, nuclear magnetic resonance （NMR） and mass spectrometry （MS）.展开更多
A new and optically stable fluorescent derivative(OPBMQ)of 1,4-bis(phenylethynyl)benzene(BPEB)with 8-hydroxyquinoline(8-HQ)as a capturing unit and cholesterol(Chol)as an auxiliary structure was designed and synthesize...A new and optically stable fluorescent derivative(OPBMQ)of 1,4-bis(phenylethynyl)benzene(BPEB)with 8-hydroxyquinoline(8-HQ)as a capturing unit and cholesterol(Chol)as an auxiliary structure was designed and synthesized.Fluorescence studies demonstrated that the fluorescence emission of the compound in the aqueous phase is characterized by two distinct and independent emissions,of which one originates from 8-HQ and the other from BPEB.Importantly,the emission is highly selective and sensitive to the presence of diethyl chlorophosphate(DCP),a simulant of Sarin.The calculated detection limit(DL)is lower than 1×10^-9mol·L^-1.Moreover,no significant response was observed when the probe was exposed to simulants of other nerve agents,relevant organophosphorus pesticides,or even their mixtures.More importantly,regardless of whether Milli-Q water,tap water or even sea water was employed as solvent,the presence of the mixture of the interferents studied did not show any significant effect on the detection of DCP.In particular,the sensitive and highly selective detection of DCP was also realized by naked-eye observation,providing a simple and low-cost protocol for the on-site and real-time detection of the chemical.Based on this discovery,a DCP monitoring device was successfully developed.展开更多
On the basis of ZINDO methods, according to the sum-overstates (SOS) expression, the program for the calculation of the second-order nonlinear optical susceptibilities βijk and βμ of molecules was devised, and the ...On the basis of ZINDO methods, according to the sum-overstates (SOS) expression, the program for the calculation of the second-order nonlinear optical susceptibilities βijk and βμ of molecules was devised, and the structures and nonlinear optical properties of unsymmetric bis(phenylethynyl) benzene series derivatives were studied. The influence of the molecular conjugated chain lengths, the donor and the acceptor on βμ was examined.展开更多
为研究聚乙烯基三苯乙炔基硅烷树脂的热分解机理,利用TG-DTG技术探讨了聚乙烯基三苯乙炔基硅烷树脂的非等温热分解过程.借助非模型拟合法和模型拟合法分析了聚乙烯基三苯乙炔基硅烷树脂(PVTPES)的热分解行为,建立了动力学函数,得到了聚...为研究聚乙烯基三苯乙炔基硅烷树脂的热分解机理,利用TG-DTG技术探讨了聚乙烯基三苯乙炔基硅烷树脂的非等温热分解过程.借助非模型拟合法和模型拟合法分析了聚乙烯基三苯乙炔基硅烷树脂(PVTPES)的热分解行为,建立了动力学函数,得到了聚乙烯基三苯乙炔基硅烷树脂的热分解反应机理.结果表明,6种热分析方法计算得到PVTPES的热分解活化能(E)在240 k J/mol左右,指前因子lg A=15.51,机理符合三维(3D)扩散控制机理.聚合物PVTPES的热分解过程分析进一步证实芳炔单体的热聚合为环三聚反应.展开更多
PMR(Polymerization of Monomer Reactants)型聚酰亚胺树脂(PI)以其优异的耐热氧化性能、机械性能、介电性能、良好的耐溶剂性能以及高的玻璃化转变温度,在航空、航天等领域得到了广泛的应用,并已成为目前使用最广泛的聚酰亚胺复合材料...PMR(Polymerization of Monomer Reactants)型聚酰亚胺树脂(PI)以其优异的耐热氧化性能、机械性能、介电性能、良好的耐溶剂性能以及高的玻璃化转变温度,在航空、航天等领域得到了广泛的应用,并已成为目前使用最广泛的聚酰亚胺复合材料的基体树脂[1～3].展开更多
为研究聚乙烯基三苯乙炔基硅烷树脂的热性能,以苯乙炔和乙烯基三氯硅烷为原料,运用格利雅反应合成了乙烯基三苯乙炔基硅烷单体,并通过红外(FT-IR)、核磁(1H-NMR,13C-NMR,29Si-NMR)证实了合成产物.以此单体为原料,通过热聚合法制备了聚...为研究聚乙烯基三苯乙炔基硅烷树脂的热性能,以苯乙炔和乙烯基三氯硅烷为原料,运用格利雅反应合成了乙烯基三苯乙炔基硅烷单体,并通过红外(FT-IR)、核磁(1H-NMR,13C-NMR,29Si-NMR)证实了合成产物.以此单体为原料,通过热聚合法制备了聚乙烯基三苯乙炔基硅烷树脂,并采用TGA-DTG研究该聚合物的热分解动力学,计算了相应动力学参数.结果表明:该树脂的热分解温度(Td5%)在550℃左右,800℃时聚合物的残炭率约80%;用Kissinger法和Ozawa法求得的聚合物热分解活化能分别为266.55和236.89 k J/mol;用Crane法求得聚合物的热分解反应级数为0.93,近似为一级反应.展开更多
基金the financial support of the National Natural Science Foundation of China(No 50403027).
文摘Three new 1,3-bis（phenylethynyl）disilazanes were synthesized from the reaction of 1,3-dichlorodisilazanes with （phenylethynyl）lithium, and characterized by infrared （IR） spectra, nuclear magnetic resonance （NMR） and mass spectrometry （MS）.
文摘A new and optically stable fluorescent derivative(OPBMQ)of 1,4-bis(phenylethynyl)benzene(BPEB)with 8-hydroxyquinoline(8-HQ)as a capturing unit and cholesterol(Chol)as an auxiliary structure was designed and synthesized.Fluorescence studies demonstrated that the fluorescence emission of the compound in the aqueous phase is characterized by two distinct and independent emissions,of which one originates from 8-HQ and the other from BPEB.Importantly,the emission is highly selective and sensitive to the presence of diethyl chlorophosphate(DCP),a simulant of Sarin.The calculated detection limit(DL)is lower than 1×10^-9mol·L^-1.Moreover,no significant response was observed when the probe was exposed to simulants of other nerve agents,relevant organophosphorus pesticides,or even their mixtures.More importantly,regardless of whether Milli-Q water,tap water or even sea water was employed as solvent,the presence of the mixture of the interferents studied did not show any significant effect on the detection of DCP.In particular,the sensitive and highly selective detection of DCP was also realized by naked-eye observation,providing a simple and low-cost protocol for the on-site and real-time detection of the chemical.Based on this discovery,a DCP monitoring device was successfully developed.
基金Project supported by the National Natural Science Foundation of China (Nos. 29890210, 29573104) and the Key Laboratory for Supramolecular Structure and Spectroscopy of Jilin Universtiy.
文摘On the basis of ZINDO methods, according to the sum-overstates (SOS) expression, the program for the calculation of the second-order nonlinear optical susceptibilities βijk and βμ of molecules was devised, and the structures and nonlinear optical properties of unsymmetric bis(phenylethynyl) benzene series derivatives were studied. The influence of the molecular conjugated chain lengths, the donor and the acceptor on βμ was examined.
文摘为研究聚乙烯基三苯乙炔基硅烷树脂的热分解机理,利用TG-DTG技术探讨了聚乙烯基三苯乙炔基硅烷树脂的非等温热分解过程.借助非模型拟合法和模型拟合法分析了聚乙烯基三苯乙炔基硅烷树脂(PVTPES)的热分解行为,建立了动力学函数,得到了聚乙烯基三苯乙炔基硅烷树脂的热分解反应机理.结果表明,6种热分析方法计算得到PVTPES的热分解活化能(E)在240 k J/mol左右,指前因子lg A=15.51,机理符合三维(3D)扩散控制机理.聚合物PVTPES的热分解过程分析进一步证实芳炔单体的热聚合为环三聚反应.
文摘为研究聚乙烯基三苯乙炔基硅烷树脂的热性能,以苯乙炔和乙烯基三氯硅烷为原料,运用格利雅反应合成了乙烯基三苯乙炔基硅烷单体,并通过红外(FT-IR)、核磁(1H-NMR,13C-NMR,29Si-NMR)证实了合成产物.以此单体为原料,通过热聚合法制备了聚乙烯基三苯乙炔基硅烷树脂,并采用TGA-DTG研究该聚合物的热分解动力学,计算了相应动力学参数.结果表明:该树脂的热分解温度(Td5%)在550℃左右,800℃时聚合物的残炭率约80%;用Kissinger法和Ozawa法求得的聚合物热分解活化能分别为266.55和236.89 k J/mol;用Crane法求得聚合物的热分解反应级数为0.93,近似为一级反应.
