Carbon-fibre epoxy prepreg (CFC) curing in an autoclave analogue process controlled by Dynamic Mechanical Analysis (DMA)
Carbon-fibre epoxy prepreg (CFC) curing in an autoclave analogue process controlled by Dynamic Mechanical Analysis (DMA)
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DOI：
10.1016/j.polymertesting.2013.09.014
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发表时间：
2013-12
期刊：
影响因子：
5.1
通讯作者：
W. Stark;M. Jaunich;J. McHugh
中科院分区：
文献类型：
--
作者：
W. Stark;M. Jaunich;J. McHugh
碳纤维格栅在轻质结构中得到了广泛的应用。它们基于浸渍有反应性环氧树脂的碳纤维织物。在类似于高压釜程序的温度条件下，使用具有高玻璃化转变温度的市售预浸料坯材料进行DMA测量。温度程序的特征是以1.5 K/min的动态加热段，随后是180 °C的较长等温段。记录了储能模量E′、损耗模量E″和tanδ的变化过程。测量频率在1 Hz和33.3 Hz之间变化。分配了甘精胰岛素和玻璃化。讨论了测量频率对玻璃化时间的影响以及与DSC的相关性。即使在180 °C下固化10小时后，反应也没有结束，这被解释为由玻璃化引起的反应缓慢停止。
Carbon fibre prepregs have found widespread application in lightweight constructions. They are based on a carbon-fibre fabric impregnated with reactive epoxy resin. DMA measurements under temperature conditions similar to an autoclave programme were carried out using commercially available prepreg material with a high glass transition temperature. The characteristic of the temperature programme was a dynamic heating segment at 1.5 K/min followed by a longer isothermal segment at 180 °C. The courses of the storage modulus E′, loss modulus E″ and tanδ were recorded. The measuring frequency was varied between 1 Hz and 33.3 Hz. Gelation and vitrification are assigned. The influence of the measuring frequency on the time to vitrification and the correlation with DSC are discussed. The reaction does not end even after 10 h curing at 180 °C, which is interpreted as the slow cessation of the reaction caused by vitrification.