Carbon-fiber-reinforced plastics(CFRP)with improved mechanical properties based on modified epoxy binders were investigated in this study.By adding 15 parts by weight(p.b.w.)of copolymer of polysulfone with cardo phth...Carbon-fiber-reinforced plastics(CFRP)with improved mechanical properties based on modified epoxy binders were investigated in this study.By adding 15 parts by weight(p.b.w.)of copolymer of polysulfone with cardo phthalide group(PSFP-70C)to the epoxyanhydride binder,the flexural strength of the epoxy polymer was increased by 60%,the CFRP based on it by 57%,the flexural modulus of the epoxy polymer was increased by 83%,and the composite by 96%.The adhesion strength of the binder to carbon fiber reached a high level at 10 p.b.w.of thermoplastic modifier and increased by 65%compared to the unmodified binder.Scanning electron microscopy(SEM)was used to determine that in epoxyanhydride systems with a polysulfone content of 5–15 p.b.w.,the structure belongs to the"matrix dispersion"type and with a content of 20 p.b.w.to the"interpenetrating phase"type.A heterogeneous structure was also observed using dynamic mechanical analysis.展开更多
以酚酞(PP)和2,6-二氯苯腈为原料进行亲核取代反应合成含酞cardo环和氰基双酚化合物(PPCN),将其与环氧氯丙烷反应合成含酞cardo环和氰基环氧树脂(PPCE)。使用红外光谱和核磁共振等手段验证目标产物的结构。用动态差示扫描量热法(DSC)研...以酚酞(PP)和2,6-二氯苯腈为原料进行亲核取代反应合成含酞cardo环和氰基双酚化合物(PPCN),将其与环氧氯丙烷反应合成含酞cardo环和氰基环氧树脂(PPCE)。使用红外光谱和核磁共振等手段验证目标产物的结构。用动态差示扫描量热法(DSC)研究PPCE与甲基纳迪克酸酐(MNA)固化的固化工艺及固化动力学。用Kissinger方程计算出固化反应的活化能为57.78 k J/mol,用Crane方程计算出反应级数为0.76。动态热机械分析结果表明,完全固化的树脂体系的玻璃化转变温度为179℃;热失重结果表明,新型环氧树脂体系具有优异的热稳定性,用Broido方法计算出327℃~357℃阶段的活化能为52.88 k J/mol,357℃~574℃阶段的活化能为13.21 k J/mol。展开更多
A series of cardo poly（aryl ether sulfone） copolymers bearing pendent sulfonic acid groups （SPES-X） have been prepared by a facile chemical graft method. The structure was confirmed by 1H-NMR spectra. The side-cha...A series of cardo poly（aryl ether sulfone） copolymers bearing pendent sulfonic acid groups （SPES-X） have been prepared by a facile chemical graft method. The structure was confirmed by 1H-NMR spectra. The side-chain-type SPES-X membranes show significantly reduced swelling behavior and excellent mechanical properties as well as appropriate proton conductivity compared to the main-chain-type sulfonated polymers with similar ion exchange capacity （IEC） value. Moreover, they show methanol permeability in the range of 0.6 × 10^-7-5.7 × 10^-7 cmE/s which is lower than that of Nafion 117. All the results indicate that the SPES-Xmembranes are promising candidates for the direct methanol fuel cells.展开更多
The effects of irradiation on the polyetherketone with cardo group (PEK-C) were studied. It was found that PEK-C can be crosslinked by irradiation under vacuum, while degradation reaction occurred in PEK-C at room tem...The effects of irradiation on the polyetherketone with cardo group (PEK-C) were studied. It was found that PEK-C can be crosslinked by irradiation under vacuum, while degradation reaction occurred in PEK-C at room temperature in the presence of air. Moreover. it was also found that Ts value of the crosslinked PEK-C at high temperature is higher than that at room temperature in the case of the same gel content, whose value is about 8℃ higher than that of unirradiated PEK-C. The gelation dose of PEK-C at 300℃ under vacuum is 1.5×10~4 Gy, which is about hundred times smaller than that at room temperature.展开更多
基金financially supported by the Ministry of Science and Higher Education of the Russian Federation。
文摘Carbon-fiber-reinforced plastics(CFRP)with improved mechanical properties based on modified epoxy binders were investigated in this study.By adding 15 parts by weight(p.b.w.)of copolymer of polysulfone with cardo phthalide group(PSFP-70C)to the epoxyanhydride binder,the flexural strength of the epoxy polymer was increased by 60%,the CFRP based on it by 57%,the flexural modulus of the epoxy polymer was increased by 83%,and the composite by 96%.The adhesion strength of the binder to carbon fiber reached a high level at 10 p.b.w.of thermoplastic modifier and increased by 65%compared to the unmodified binder.Scanning electron microscopy(SEM)was used to determine that in epoxyanhydride systems with a polysulfone content of 5–15 p.b.w.,the structure belongs to the"matrix dispersion"type and with a content of 20 p.b.w.to the"interpenetrating phase"type.A heterogeneous structure was also observed using dynamic mechanical analysis.
文摘以酚酞(PP)和2,6-二氯苯腈为原料进行亲核取代反应合成含酞cardo环和氰基双酚化合物(PPCN),将其与环氧氯丙烷反应合成含酞cardo环和氰基环氧树脂(PPCE)。使用红外光谱和核磁共振等手段验证目标产物的结构。用动态差示扫描量热法(DSC)研究PPCE与甲基纳迪克酸酐(MNA)固化的固化工艺及固化动力学。用Kissinger方程计算出固化反应的活化能为57.78 k J/mol,用Crane方程计算出反应级数为0.76。动态热机械分析结果表明,完全固化的树脂体系的玻璃化转变温度为179℃;热失重结果表明,新型环氧树脂体系具有优异的热稳定性,用Broido方法计算出327℃~357℃阶段的活化能为52.88 k J/mol,357℃~574℃阶段的活化能为13.21 k J/mol。
基金financially supported by the National Natural Science Foundation of China(No.51203151)the Program of Jilin Education Department(No.93201201)
文摘A series of cardo poly（aryl ether sulfone） copolymers bearing pendent sulfonic acid groups （SPES-X） have been prepared by a facile chemical graft method. The structure was confirmed by 1H-NMR spectra. The side-chain-type SPES-X membranes show significantly reduced swelling behavior and excellent mechanical properties as well as appropriate proton conductivity compared to the main-chain-type sulfonated polymers with similar ion exchange capacity （IEC） value. Moreover, they show methanol permeability in the range of 0.6 × 10^-7-5.7 × 10^-7 cmE/s which is lower than that of Nafion 117. All the results indicate that the SPES-Xmembranes are promising candidates for the direct methanol fuel cells.
文摘The effects of irradiation on the polyetherketone with cardo group (PEK-C) were studied. It was found that PEK-C can be crosslinked by irradiation under vacuum, while degradation reaction occurred in PEK-C at room temperature in the presence of air. Moreover. it was also found that Ts value of the crosslinked PEK-C at high temperature is higher than that at room temperature in the case of the same gel content, whose value is about 8℃ higher than that of unirradiated PEK-C. The gelation dose of PEK-C at 300℃ under vacuum is 1.5×10~4 Gy, which is about hundred times smaller than that at room temperature.
