Curing behavior of a model epoxies system (E-54/AG-80) with DDS as hardener was studied in this paper. Round disk compression mode DMA was executed to study the gel behaviors at different temperatures to determine the...Curing behavior of a model epoxies system (E-54/AG-80) with DDS as hardener was studied in this paper. Round disk compression mode DMA was executed to study the gel behaviors at different temperatures to determine the relationship between gel-time (t_ gel) and temperature. The cure kinetics was studied by dynamic DSC analysis. Parameters were obtained for establishing a phenomenological cure reaction model. The relationship between glass transition temperature (T_g) and cure degree (α) was also analyzed by both isothermal and dynamic DSC method based on DiBenedetto equation, which gave a mathematical description of T_g as a function of both time and temperature. Consequently, characteristic temperatures such as T_ g0, gelT_ g and T_ g∞ were determined. Finally, the Time-Temperature-Transition (TTT) diagram was designed based on the data and equations.展开更多
Time-temperature-transformation diagram for epoxy-terminated poly(phenylene ether ketone) and 4, 4*-diaminodiphenyl sulfone was studied using a differential scanning calorimeter, thermal grametry analyzer and a cone-a...Time-temperature-transformation diagram for epoxy-terminated poly(phenylene ether ketone) and 4, 4*-diaminodiphenyl sulfone was studied using a differential scanning calorimeter, thermal grametry analyzer and a cone-and-plate rheometer. Based on a predicting model proposed here, which is used for determining the times to vitrification (tvit), and only few experimental results from DSC, T’GA and cone-and-plate rileometer, TTT diagram can be easily determined.展开更多
文摘Curing behavior of a model epoxies system (E-54/AG-80) with DDS as hardener was studied in this paper. Round disk compression mode DMA was executed to study the gel behaviors at different temperatures to determine the relationship between gel-time (t_ gel) and temperature. The cure kinetics was studied by dynamic DSC analysis. Parameters were obtained for establishing a phenomenological cure reaction model. The relationship between glass transition temperature (T_g) and cure degree (α) was also analyzed by both isothermal and dynamic DSC method based on DiBenedetto equation, which gave a mathematical description of T_g as a function of both time and temperature. Consequently, characteristic temperatures such as T_ g0, gelT_ g and T_ g∞ were determined. Finally, the Time-Temperature-Transition (TTT) diagram was designed based on the data and equations.
文摘Time-temperature-transformation diagram for epoxy-terminated poly(phenylene ether ketone) and 4, 4*-diaminodiphenyl sulfone was studied using a differential scanning calorimeter, thermal grametry analyzer and a cone-and-plate rheometer. Based on a predicting model proposed here, which is used for determining the times to vitrification (tvit), and only few experimental results from DSC, T’GA and cone-and-plate rileometer, TTT diagram can be easily determined.
