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Internal and External Catalysis in Boronic Ester Networks
ACS Macro Letters ( IF 5.1 ) Pub Date : 2022-03-02 , DOI: 10.1021/acsmacrolett.2c00056 Boyeong Kang 1 , Julia A Kalow 1
ACS Macro Letters ( IF 5.1 ) Pub Date : 2022-03-02 , DOI: 10.1021/acsmacrolett.2c00056 Boyeong Kang 1 , Julia A Kalow 1
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In dynamic materials, the reversible condensation between boronic acids and diols provides adaptability, self-healing ability, and responsiveness to small molecules and pH. The thermodynamics and kinetics of bond exchange determine the mechanical properties of dynamic polymer networks. Here, we investigate the effects of diol structure and salt additives on the rate of boronic acid–diol bond exchange, binding affinity, and the mechanical properties of the corresponding polymer networks. We find that proximal amides used to conjugate diols to polymers and buffering anions induce significant rate acceleration, consistent with an internal and external catalysis, respectively. This rate acceleration is reflected in the stress relaxation of the gels. These findings contribute to the fundamental understanding of the boronic ester dynamic bond and offer molecular strategies to tune the macromolecular properties of dynamic materials.
中文翻译：
硼酸酯网络中的内部和外部催化
在动态材料中，硼酸和二醇之间的可逆缩合提供了适应性、自愈能力以及对小分子和 pH 值的响应性。键交换的热力学和动力学决定了动态聚合物网络的机械性能。在这里，我们研究了二醇结构和盐添加剂对硼酸-二醇键交换速率、结合亲和力和相应聚合物网络的机械性能的影响。我们发现用于将二醇与聚合物结合和缓冲阴离子的近端酰胺会导致显着的速率加速，这分别与内部和外部催化一致。这种速率加速反映在凝胶的应力松弛中。
更新日期：2022-03-02
中文翻译：
硼酸酯网络中的内部和外部催化
在动态材料中，硼酸和二醇之间的可逆缩合提供了适应性、自愈能力以及对小分子和 pH 值的响应性。键交换的热力学和动力学决定了动态聚合物网络的机械性能。在这里，我们研究了二醇结构和盐添加剂对硼酸-二醇键交换速率、结合亲和力和相应聚合物网络的机械性能的影响。我们发现用于将二醇与聚合物结合和缓冲阴离子的近端酰胺会导致显着的速率加速，这分别与内部和外部催化一致。这种速率加速反映在凝胶的应力松弛中。
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