A series of phthalonitrile blending resins were prepared from 4-aminophenoxyphthalonitrile(APN) and 4,4'-bis(3,4- dicyanophenoxy)biphenyl(BPH) by directly powder-mixing and copolymerization.Differential scanning c...A series of phthalonitrile blending resins were prepared from 4-aminophenoxyphthalonitrile(APN) and 4,4'-bis(3,4- dicyanophenoxy)biphenyl(BPH) by directly powder-mixing and copolymerization.Differential scanning calorimeter(DSC) and dynamic rheology were used to study the curing reaction behaviors of APN/BPH blends,and the results indicated that the introduction of APN accelerated the curing rate of BPH,and the existence of BPH decreased the curing temperature of APN/BPH systems.The thermal stability of postcured APN/BPH resins was investigated by thermogravimetric analysis(TGA),and the TGA results indicated that the crosslinked polymers of APN/BPH systems possessed good thermal stability.展开更多
Investigations of the absorption and fluorescence spectra of hexakis (4-aminophenoxy)- cyclotriphosphazene at room temperature in three solvents of different polarity (N, N-dimethyl- formamide, tetrahydrofuran and tol...Investigations of the absorption and fluorescence spectra of hexakis (4-aminophenoxy)- cyclotriphosphazene at room temperature in three solvents of different polarity (N, N-dimethyl- formamide, tetrahydrofuran and toluene) have been conducted. And fluorescence lifetimes of these three solutions were also measured. Major reasons of such spectral behavior are discussed.展开更多
文摘A series of phthalonitrile blending resins were prepared from 4-aminophenoxyphthalonitrile(APN) and 4,4'-bis(3,4- dicyanophenoxy)biphenyl(BPH) by directly powder-mixing and copolymerization.Differential scanning calorimeter(DSC) and dynamic rheology were used to study the curing reaction behaviors of APN/BPH blends,and the results indicated that the introduction of APN accelerated the curing rate of BPH,and the existence of BPH decreased the curing temperature of APN/BPH systems.The thermal stability of postcured APN/BPH resins was investigated by thermogravimetric analysis(TGA),and the TGA results indicated that the crosslinked polymers of APN/BPH systems possessed good thermal stability.
基金The research is supported by the National Natural Sciences Foundation of China(Grant No:69990540)
文摘Investigations of the absorption and fluorescence spectra of hexakis (4-aminophenoxy)- cyclotriphosphazene at room temperature in three solvents of different polarity (N, N-dimethyl- formamide, tetrahydrofuran and toluene) have been conducted. And fluorescence lifetimes of these three solutions were also measured. Major reasons of such spectral behavior are discussed.
