A cure kinetics, diffusion controlled and temperature dependent, identification of the Araldite LY556 epoxy
A cure kinetics, diffusion controlled and temperature dependent, identification of the Araldite LY556 epoxy
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DOI：
10.1007/s10853-010-4815-7
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发表时间：
2011-02-01
影响因子：
4.5
通讯作者：
Grandidier, J. C.
中科院分区：
文献类型：
--
作者：
Rabearison, N.;Jochum, Ch.;Grandidier, J. C.
采用等温和非等温差示扫描量热法研究了质量比为10 0：90：2的DGEBA型环氧树脂与酸酐固化剂HY917和促进剂L甲基咪唑DY0 70的固化反应。使用动态测量来评估环氧树脂热固性反应的总热和极限热，并使等温固化的实验转化率得以确定。为了进一步对固化过程进行有限元模拟，本文重点研究了一种完整的、与温度相关的固化动力学参数识别策略，该方法将Kamal和Sourour唯象模型扩展为扩散因子。对扩散描述给予了特别关注，它允许识别LY556环氧树脂的固定反应级数。在等温转化数据分析的基础上，给出了固化动力学参数的辨识方法。这导致了LY556环氧共混物的所有固化动力学参数的温度依赖性识别，包括扩散控制描述和相应的温度依赖性。然后，通过计算转换结果强调了固化动力学、鉴定质量和扩散控制现象对环氧树脂固化的重要性，这些结果在鉴定所用的温度范围内与数据基本吻合。
The curing of the LY556 epoxy system, a DGEBA-type epoxy resin with an anhydride hardener HY917 and a l-methyl imidazole DY 070 accelerator, mass ratio 100:90:2, was investigated by isothermal and nonisothermal differential scanning calorimetry (DSC). Dynamic measurements were used to evaluate the total, ultimate, heat of the epoxy resin thermosetting reaction and enable experimental conversion determination for isothermal curing. Aiming further finite element modelling of the curing, this article especially focuses on a complete, temperature dependent, cure kinetics parameters identification strategy with the Kamal and Sourour phenomenological model expanded by a diffusion factor. A special attention was given for diffusion description which allows the identification of a fixed order of reaction for the LY556 epoxy resin. Based on isothermal conversion data analysis, the methodology for cure kinetics parameters identification is presented. This led to a temperature dependent identification of all cure kinetics parameters of the LY556 epoxy blend, including diffusion control description and corresponding temperature dependency. Cure kinetics identification quality and importance of diffusion control phenomenon for the curing of the epoxy are then highlighted by computed conversion results that fit almost well the data in the range of temperature used for identification.