轮烷
分子间力
氢键
聚合物
烷基
异氰酸酯
高分子化学
超分子聚合物
韧性
材料科学
化学
分子
有机化学
复合材料
超分子化学
聚氨酯
作者
Lang He,Wei Wang,Zibin Zhang,Ning Shentu,Jiao Wang,Jiaxi Yu,Zhiqiang Ren,Jiyong Liu,Guangfeng Li,Feihe Huang,Shijun Li
标识
DOI:10.1021/acs.macromol.4c00150
摘要
Rotaxanes have demonstrated great potential in the development of smart materials owing to their attractive dynamic and movable properties. However, it remains a significant challenge to construct polymers with outstanding mechanical performance by the introduction of rotaxane units. Here, we synthesized several pillar[5]arene-based [2]rotaxanes by condensation reaction of 1-naphthyl isocyanate and alkyl diamines and introduced them into covalent polymers through ring-opening metathesis polymerization. The rigid and bulky pillar[5]arene units, sliding motions of rotaxane moieties, and intra- and intermolecular hydrogen bonds between urea groups endow the polymers with excellent mechanical properties (PR4: Young's modulus = 360.1 ± 32.1 MPa, yield stress = 14.2 ± 0.1 MPa, stress at break = 14.8 ± 0.6 MPa, and toughness = 67.8 ± 2.0 MJ/m3). Moreover, the mechanical properties of PR4 could be weakened and strengthened by the introduction of Ac– and Cl–, respectively, showing their abundant regulable features. These findings provide novel insights into the preparation of advanced supramolecular materials with enhanced mechanical properties.
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