Atomic Force Microscopy Nanomechanical Mapping Visualizes Interfacial Broadening between Networks Due to Chemical Exchange Reactions
Atomic Force Microscopy Nanomechanical Mapping Visualizes Interfacial Broadening between Networks Due to Chemical Exchange Reactions
复制标题
原子力显微镜纳米力学绘图可视化由于化学交换反应而导致的网络之间的界面展宽
DOI：
10.1021/jacs.8b03771
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发表时间：
2018-06-06
影响因子：
15
通讯作者：
Wang, Dong
中科院分区：
文献类型：
--
作者：
He, Changfei;Shi, Shaowei;Wang, Dong
具有不同模量的两种不同的环氧树脂网络之间的界面增宽的纳米力学映射。两个网络的界面加宽产生了具有浓度梯度的界面区，因此，具有原始两个网络的性质。网络的这种界面加宽导致产生具有对应于原始两个网络片段的混合物的片段组成的新网络。由于交换反应的性质，两者的混合是在链段水平上进行的。通过绘制不同温度下模量变化的时间依赖性，测量交换反应的动力学，并且通过改变温度，确定交换反应的活化能。
The interfacial broadening between two different epoxy networks having different moduli was nanomechanically mapped. The interfacial broadening of the two networks produced an interfacial zone having a gradient in the concentration and, hence, properties of the original two networks. This interfacial broadening of the networks leads to the generation of a new network with a segmental composition corresponding to a mixture of the original two network segments. The intermixing of the two, by nature of the exchange reactions, was on the segmental level. By mapping the time dependence of the variation in the modulus at different temperatures, the kinetics of the exchange reaction was measured and, by varying the temperature, the activation energy of the exchange reaction was determined.