Cross-Linking Effect on Segmental Dynamics of Well-Defined Epoxy Resins
Cross-Linking Effect on Segmental Dynamics of Well-Defined Epoxy Resins
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DOI：
10.1021/acs.macromol.1c00513
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发表时间：
2021-06
期刊：
影响因子：
5.5
通讯作者：
A. Shundo;Mika Aoki;Satoru Yamamoto;Keiji Tanaka
中科院分区：
文献类型：
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作者：
A. Shundo;Mika Aoki;Satoru Yamamoto;Keiji Tanaka
具有网络结构的环氧树脂是一类重要的热固性树脂，其通过环氧化合物和胺化合物的固化反应获得。我们在这里报告的环氧树脂的链段动力学的三维网络是定义明确，系统地变化。我们发现，通过实验结合原子分子动力学模拟的是，当在环氧树脂的交联密度增加，玻璃化转变温度增加与合作重排区域的空间尺度的相关减少和动态不均匀性的增加。这里获得的知识应该是有用的，更好地了解热固性聚合物的物理性能。
Epoxy resins with a network structure, which are obtained by curing reactions of epoxy and amine compounds, are an important class of thermosetting resins. We here report the segmental dynamics of epoxy resins in which the three-dimensional network was well-defined and systematically varied. What we found by experiments in conjunction with atomistic molecular dynamics simulation was that when the cross-linking density in the epoxy resins increased, the glass transition temperature increased with an associated reduction in the spatial scale of the cooperative rearranging region and the increase in the dynamic heterogeneity. The knowledge here obtained should be useful for a better understanding of the physical properties of thermosetting polymers.