Cure state detection for pre-cured carbon-fibre epoxy prepreg (CFC) using Temperature-Modulated Differential Scanning Calorimetry (TMDSC)
Cure state detection for pre-cured carbon-fibre epoxy prepreg (CFC) using Temperature-Modulated Differential Scanning Calorimetry (TMDSC)
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DOI：
10.1016/j.polymertesting.2013.07.007
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发表时间：
2013-10
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：
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作者：
W. Stark;M. Jaunich;J. McHugh
碳纤维预浸料在轻质应用中得到了广泛的应用。它们是以碳纤维织物为基础的，这种织物浸渍了活性环氧树脂。预浸料材料通常是预固化的，因此它们具有比典型树脂更高的分子量，以减少树脂流动，从而促进存储和后续加工性能。测量是使用商业可获得的材料进行的，并遵循相同材料的DMA研究[1]。用TMDSC分析了固化条件、固化度和玻璃化转变温度之间的关系。与标准DSC相比，TMDSC的优势在于它能够更好地确定玻璃化转变温度，而玻璃化转变温度往往伴随着放热固化反应，因此黯然失色。在初步实验中，测试了温度调制幅度的影响。未固化材料的玻璃化转变温度约为0℃，而完全固化材料的玻璃化转变温度约为230℃。给出了固化度、实际玻璃化转变温度和后反应随180℃固化时间的变化情况，并导出了实际玻璃化转变温度与固化度之间的关系。
Carbon-fibre prepregs have found widespread use in lightweight applications. They are based on a carbon-fibre fabric impregnated with reactive epoxy resin. Prepreg materials are generally pre-cured so that they have a higher molecular weight than typical resins in order to reduce resin flow, which facilitates storage and later processing properties.The measurements were carried out using commercially available materials and follow the published DMA investigations of the same material [1]. TMDSC was used to find the correlation between curing conditions, the degree of cure and glass transition temperature. TMDSC has the advantage over standard DSC that it enables better determination of the glass transition temperature, which is often accompanied by an exothermic curing reaction, and thus overshadowed. The influence of the amplitude of temperature modulation was tested in preliminary experiments. For non-cured material a glass transition temperature of approximately 0 °C was determined; whereas for the totally cured material it was approximately 230 °C. The changes in degree of cure, temperature of actual glass transition and post-reaction are given as a function of curing time at 180 °C. The correlation between actual glass transition temperature and degree of cure is derived.