Using Dynamic Bonds to Enhance the Mechanical Performance: From Microscopic Molecular Interactions to Macroscopic Properties
Using Dynamic Bonds to Enhance the Mechanical Performance: From Microscopic Molecular Interactions to Macroscopic Properties
复制标题
利用动态键增强机械性能：从微观分子相互作用到宏观性能
DOI：
10.1021/acs.macromol.9b00503
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发表时间：
2019
期刊：
影响因子：
5.5
通讯作者：
Sun Pingchuan
中科院分区：
文献类型：
--
作者：
Zhang Chi;Yang Zhijun;Nghia Tuan Duong;Li Xiaohui;Nishiyama Yusuke;Wu Qiang;Zhang Rongchun;Sun Pingchuan
聚合物材料结合了良好的机械性能与自修复能力和延展性已经引起了极大的关注，但目前对于这种高性能材料的简易制造仍然是一个挑战，更不用说理解宏观性质的分子起源的原子水平表征了。在此，我们提出了一种简单的策略来制备双交联的聚（丙烯酸正丁酯）聚合物材料，其中2-脲基-4 [1H]-嘧啶酮（UPy）二聚体之间的自互补四重氢键相互作用被用作动态牺牲交联，从而提高机械强度和韧性。通过选择性饱和双量子（DQ）固体核磁共振谱，在60 kHz以上的超快魔角旋转条件下，详细揭示了这种交联聚合物材料中UPy二聚体之间的氢键相互作用.与此同时，我们的自我修复能力和可回收性...
Polymeric materials combining good mechanical performances with self-healing ability and malleability have attracted dramatic attention, but it presently remains a challenge for the facile fabrication of such high-performance materials, not to mention the atomic-level characterization for understanding the molecular origin of the macroscopic properties. Herein, we proposed a facile strategy to fabricate a dual-cross-linked poly(n-butyl acrylate) polymer material, in which the self-complementary quadruple hydrogen bonding interactions between 2-ureido-4[1H]-pyrimidinone (UPy) dimers were utilized as the dynamic sacrificial cross-linkages, and thus to enhance the mechanical strength and toughness. The hydrogen bonding interactions between UPy dimers in such synthetic cross-linked polymer material were revealed in detail by selective saturation double-quantum (DQ) solid-state NMR spectroscopy under ultrafast magic-angle-spinning beyond 60 kHz. In the meantime, the self-healing capability and recyclability we...