Thermal and kinetic characterization of a toughened epoxy resin reinforced with carbon fibers
Thermal and kinetic characterization of a toughened epoxy resin reinforced with carbon fibers
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DOI：
10.1016/j.tca.2011.01.034
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发表时间：
2011-04-20
影响因子：
3.5
通讯作者：
Milella, Eva
中科院分区：
文献类型：
--
作者：
Branca, Carmen;Di Blasi, Colomba;Milella, Eva
复合材料（Cycom 977-2/Priform，Cytec），基于增韧环氧树脂与碳纤维增强，氧化行为进行了研究，在动力学制度和混合热扩散制度。复合材料和两个单一组分的热重测量支持三个主要反应阶段的存在。第一种是在496至730 K的温度下发生的树脂的氧化分解，其可以通过具有82 kJ/mol的活化能的反应来描述。第二和第三反应阶段对应于树脂炭的氧化，其在约850 K终止，并且在较高温度下对应于碳纤维的氧化，其分别由具有105和184 kJ/mol的活化能的全局动力学描述。在炉中燃烧的厚样品的热历史取决于在氮气中的加热温度和/或在空气中的最高温度，这是由反应温度引起的。在惰性加热阶段之后，当达到最大样品加热速率时，过程动力学再次显示存在三个主要反应阶段，其特征时间和温度被确定。(C)2011爱思唯尔有限公司版权所有。
The oxidation behavior of a composite material (Cycom 977-2/Priform by Cytec), based on a toughened epoxy resin reinforced with carbon fibers, is studied in the kinetic regime and a mixed thermal-diffusive regime. Thermogravimetric measurements for the composite material and the two single components support the existence of three main reaction stages. The first is the oxidative decomposition of the resin taking place at temperatures between 496 and 730 K that can be described by a reaction with an activation energy of 82 kJ/mol. The second and third reaction stages correspond to the oxidation of the resin char, that terminates at about 850 K, and at higher temperatures the oxidation of the carbon fibers, described by global kinetics with activation energies of 105 and 184 kJ/mol, respectively. The thermal history of thick samples burning in a furnace depends on the heating temperature, in nitrogen, and/or the maximum temperature, in air, caused by the reaction exothermicity. After an inert heating stage, when maximum sample heating rates are achieved, the process dynamics again show the existence of three main reaction stages whose characteristic times and temperatures are determined. (C) 2011 Elsevier B.V. All rights reserved.