In this study,the durability of a new polymer carbonfiber-reinforced epoxy resin used to produce composite material in the aerospacefield is investigated through analysis of the corrosion phenomena occurring at the micr...In this study,the durability of a new polymer carbonfiber-reinforced epoxy resin used to produce composite material in the aerospacefield is investigated through analysis of the corrosion phenomena occurring at the microscopic scale,and the related infrared spectra and thermal properties.It is found that light and heat can con-tribute to the aging process.In particular,the longitudinal tensile strength displays a non-monotonic trend,i.e.,itfirst increases and then decreases over time.By contrast,the longitudinal compressive and inter-laminar shear strengths do not show significant changes.It is also shown that the inter-laminar shear strength of carbonfiber/epoxy resin composites with inter-laminar hybrid structure is better than that of pure carbonfiber materials.The related resistance to corrosion can be improved by more than 41%.展开更多
The thermal decomposition of a kind of brominted epoxy resin(BER) printed circuit boards was investigated by using TG-FTIR and Py-GC/MS.The mechanism of the thermal decomposition of the resin was discussed.The experim...The thermal decomposition of a kind of brominted epoxy resin(BER) printed circuit boards was investigated by using TG-FTIR and Py-GC/MS.The mechanism of the thermal decomposition of the resin was discussed.The experimental results show that during the thermal decomposition of BER,the brominated parts are firstly decomposed with the splitting of OH—C,O—CH2,C—C(Benzene) bonds,and the pyrolysis products such as CO,acetone,bromomethane,bromophenol and 2,6-dibromophenol are produced.The decomposition of unbrominated parts is conducted at higher temperature with the splitting of OH—C,CH2—O—benzene,C—C(Benzene) bonds,and the pyrolysis products containing phenol,p-isopropylphenol,p-isopropenylacetylphenol,o-methylphenol and p-methylphenol are made.展开更多
文摘In this study,the durability of a new polymer carbonfiber-reinforced epoxy resin used to produce composite material in the aerospacefield is investigated through analysis of the corrosion phenomena occurring at the microscopic scale,and the related infrared spectra and thermal properties.It is found that light and heat can con-tribute to the aging process.In particular,the longitudinal tensile strength displays a non-monotonic trend,i.e.,itfirst increases and then decreases over time.By contrast,the longitudinal compressive and inter-laminar shear strengths do not show significant changes.It is also shown that the inter-laminar shear strength of carbonfiber/epoxy resin composites with inter-laminar hybrid structure is better than that of pure carbonfiber materials.The related resistance to corrosion can be improved by more than 41%.
文摘The thermal decomposition of a kind of brominted epoxy resin(BER) printed circuit boards was investigated by using TG-FTIR and Py-GC/MS.The mechanism of the thermal decomposition of the resin was discussed.The experimental results show that during the thermal decomposition of BER,the brominated parts are firstly decomposed with the splitting of OH—C,O—CH2,C—C(Benzene) bonds,and the pyrolysis products such as CO,acetone,bromomethane,bromophenol and 2,6-dibromophenol are produced.The decomposition of unbrominated parts is conducted at higher temperature with the splitting of OH—C,CH2—O—benzene,C—C(Benzene) bonds,and the pyrolysis products containing phenol,p-isopropylphenol,p-isopropenylacetylphenol,o-methylphenol and p-methylphenol are made.
