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首页> 外文期刊>Journal of Thermal Analysis and Calorimetry >Effect of thermoplastic toughening agent on glass transition temperature and cure kinetics of an epoxy prepreg
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Effect of thermoplastic toughening agent on glass transition temperature and cure kinetics of an epoxy prepreg

机译：热塑性增韧剂对环氧预浸料的玻璃化转变温度和固化动力学的影响

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摘要

The isothermal time–temperature-transformation (TTT) cure diagram is developed in this article to investigate the effect of thermoplastic toughening agent on glass transition temperature (T g) and cure kinetics of an epoxy carbon fiber prepreg, Cycom 977-2 unidirectional (UD) tape. The glass transition temperature was measured using differential scanning calorimetry (DSC) over a wide range of isothermal cure temperatures from 140 to 200 °C. Times to gelation and vitrification were measured using shear rheometry. The glass transition temperature master curve was obtained from the experimental data and the corresponding shift factors were used to calculate the activation energy. The kinetic rate model was utilized to construct iso-T g contours using the calculated activation energy. It was observed that the iso-T g contours did not follow the behavior of the neat epoxy resin, since they deviated from the gel time curve. This deviation was believed to be the effect of the thermoplastic toughening agent. The behavior of the neat epoxy resin in 977-2 was shown by constructing the iso-T g contours using the activation energy obtained from gel time modeling.
机译：本文开发了等温时间-温度转变（TTT）固化图，以研究热塑性增韧剂对玻璃化转变温度（T g ）的影响以及环氧碳纤维预浸料的固化动力学， Cycom 977-2单向（UD）磁带。使用差示扫描量热法（DSC）在140至200°C的宽范围的等温固化温度下测量玻璃化转变温度。使用剪切流变法测量胶凝和玻璃化的时间。从实验数据获得玻璃化转变温度主曲线，并使用相应的位移因子来计算活化能。利用动力学速率模型，利用计算出的活化能构建iso-T g 等高线。观察到，iso-T g 轮廓不遵循纯环氧树脂的行为，因为它们偏离了凝胶时间曲线。该偏差被认为是热塑性增韧剂的作用。通过使用由胶凝时间建模获得的活化能构建iso-T g 等高线，可以显示出977-2中纯净环氧树脂的行为。

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