Cure Kinetics of a Carbon Fiber/Epoxy Prepreg by Dynamic Differential Scanning Calorimetry

IF 3.4 4区化学 Q2 POLYMER SCIENCE

International Journal of Polymer Science Pub Date : 2023-06-15 DOI:10.1155/2023/5244722

Kaihua Chen, Xiaobao Zhu, G. Zhao, J. Chen, Shenghui Guo

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引用次数: 1

Abstract

Investigating the curing kinetics of a fiber prepreg system is beneficial to the controlling of prepreg laminate curing process. In the present work, a dicyandiamide (DICY)-cured carbon fiber/epoxy prepreg system was investigated by non-isothermal differential scanning calorimetry (DSC) at 2, 5, 10, and 20°C/min to attain the glass transition temperature for uncured prepreg and fully cured sample, which were estimated to be 7.6°C and 106.2°C, respectively. The activation energy (Ea) of the prepreg system was evaluated by Kissinger and Ozawa methods, and Friedman method was also employed to reveal the evolution of Ea as a function of curing degree. The kinetic parameters were determined by fitting the average Ea value obtained by Friedman method into Málek methodology, and the two parameters Šesták–Berggren model was found to best describe the curing kinetic of the prepreg system. The preexponential factor was calculated to be 6.0 × 10 8 min−1, with the overall reaction order at nearly 2.5. The prediction curves, based on Friedman method and autocatalytic model, were in good agreement with the experimental data.

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动态差示扫描量热法研究碳纤维/环氧预浸料的固化动力学

研究纤维预浸料系统的固化动力学有利于控制预浸料层压板的固化过程。在本工作中，通过非等温差示扫描量热法（DSC）在2、5、10和20°C/min下研究了双氰胺（DICY）固化的碳纤维/环氧预浸料系统，以获得未固化预浸料和完全固化样品的玻璃化转变温度，估计分别为7.6°C和106.2°C。采用Kissinger和Ozawa方法评估了预浸料坯体系的活化能（Ea），并采用Friedman方法揭示了Ea随固化度的变化。通过将Friedman方法获得的平均Ea值拟合到Málek方法中来确定动力学参数，发现两个参数Šesták–Berggren模型最能描述预浸料坯系统的固化动力学。预测因子为6.0×108 min−1，总反应级数接近2.5。基于Friedman方法和自催化模型的预测曲线与实验数据吻合较好。

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来源期刊

International Journal of Polymer Science POLYMER SCIENCE-

CiteScore

6.10

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： The International Journal of Polymer Science is a peer-reviewed, Open Access journal that publishes original research articles as well as review articles on the chemistry and physics of macromolecules.