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首页> 外文期刊>Journal of Applied Polymer Science >Modeling the Effect of the Curing Conversion on the Dynamic Viscosity of Epoxy Resins Cured by an Anhydride Curing Agent
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Modeling the Effect of the Curing Conversion on the Dynamic Viscosity of Epoxy Resins Cured by an Anhydride Curing Agent

机译：模拟固化转化率对酸酐固化剂固化的环氧树脂动态粘度的影响

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摘要

Published curing profiles of epoxy resins mixed with an anhydride curing agent and subsequently crosslinked were reanalyzed with a modified sigmoidal model to describe the dynamic viscosity accompanying resin curing. The sigmoidal analysis yielded two kinetic parameters, one relating to the induction time required to observe meaningful viscosity changes and one relating to the rate of viscosity rise in the rapidly polymerizing zone. Both of these kinetic factors decreased with increasing polymerization temperature. The analysis also led to the interpretation of the upper limit in viscosity in the model that correlated with a higher network density at higher temperatures. The initial viscosity was fixed in our model. The sigmoidal analysis led to a closer representation of the dynamic viscosity data than the Williams-Landel-Ferry (WLF)-based analysis presented with the original data sets and, although from a more semiempirical basis, might be both easier and more adaptable for incorporating into other flow models. As a final observation, the induction time identified by the log-sigmoidal model correlated closely with the gelation time identified with a modified-WLF-based model by Ivankovic et al. (J Appl Polym Sci 2003, 90, 3012); this suggested a similar activation energy threshold for curing advancement.
机译：混合了酸酐固化剂并随后交联的环氧树脂的已发布固化曲线，使用改进的S型模型进行了重新分析，以描述伴随树脂固化的动态粘度。乙状结肠分析产生两个动力学参数，一个与观察有意义的粘度变化所需的诱导时间有关，另一个与快速聚合区的粘度上升速率有关。随着聚合温度的升高，这两个动力学因素均降低。分析还导致对模型中粘度上限的解释，该上限与较高温度下较高的网络密度相关。初始粘度在我们的模型中是固定的。与基于原始数据集的基于Williams-Landel-Ferry（WLF）的分析相比，S形分析使动态粘度数据的表示更接近，尽管从半经验的角度出发，它可能更容易且更易于合并进入其他流量模型。最终观察到，对数乙状结肠模型确定的诱导时间与Ivankovic等人基于改进的基于WLF的模型确定的胶凝时间紧密相关。 （J Appl Polym Sci 2003，90，3012）;这表明固化进展的活化能阈值相似。

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