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Aerospace composite cured by quickstep and autoclave processing techniques: Evaluation and comparison of reaction progress

机译：快速步骤和高压釜处理技术固化的航空航天复合材料：反应进展的评估和比较

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摘要

Quickstep is relatively a new technique for aerospace composite processing. Thermoset resins (prepregs) have been frequently designed by autoclave method requiring low ramp rate curing of 2–3 K min−1. However, ramp rate up to 15 K min−1 has been achieved via Quickstep processing. This technique allows alteration in chemo-rheology of resin system and so influences the reaction progress. In this attempt, Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and dynamic mechanical thermal analysis (DMTA) were used to monitor the cure progress of 977-2A epoxy resin and carbon fiber reinforced composite. The curing reaction progress of 977-2A epoxy/carbon fiber was considered for the first time by comparing Quickstep processing and autoclave method. According to DSC results, the reaction progress in Quickstep technique was comparable to that of autoclave curing. Moreover, DMTA of Quickstep cured samples showed increase in glass transition temperature (Tg) due to increased cross-linking density at greater hold time (upper cure temperature). FTIR was used to monitor the conversion of representative functional groups versus applied Quickstep and autoclave curing steps. The structural analysis depicted that the Quickstep curing path for 977-2A resin was different than the autoclave curing; however the final cross-linked structure was similar to that of autoclave cured samples.
机译：Quickstep是相对较新的航空复合材料加工技术。热固性树脂（预浸料）通常是通过高压釜法设计的，需要2–3 K min-1的低升温速率固化。但是，通过Quickstep处理可以达到15 K min-1的斜坡速率。该技术允许改变树脂体系的化学流变性，因此影响反应进程。在此尝试中，傅里叶变换红外光谱（FTIR），差示扫描量热法（DSC）和动态机械热分析（DMTA）用于监测977-2A环氧树脂和碳纤维增强复合材料的固化过程。通过比较Quickstep工艺和高压釜法，首次考虑了977-2A环氧/碳纤维的固化反应进程。根据DSC结果，Quickstep技术中的反应进展与高压釜固化相当。此外，Quickstep固化样品的DMTA由于在较长的保持时间（较高的固化温度）下交联密度增加而显示出玻璃化转变温度（Tg）的增加。 FTIR用于监测代表性官能团相对于应用的Quickstep和高压釜固化步骤的转化率。结构分析表明，977-2A树脂的Quickstep固化路径与高压釜的固化路径不同。但是最终的交联结构与高压釜固化的样品相似。

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