Polymers are ideally utilized as damping materials due to the high internal friction of molecular chains, enabling effective suppression of vibrations and noises in various fields. Current strategies rely on broadening the glass transition region or introducing additional relaxation components to enhance the energy dissipation capacity of polymeric damping materials. However, it remains a significant challenge to achieve high damping efficiency through structural control while maintaining dynamic characteristics. In this work, we propose a new strategy to develop hyperbranched vitrimers (HBVs) containing dense pendant chains and loose dynamic crosslinked networks. A novel yet weak dynamic transesterification between the carboxyl and boronic acid ester was confirmed and used to prepare HBVs based on poly (hexyl methacrylate‐2‐(4‐ethenylphenyl)‐5,5‐dimethyl‐1,3,2‐dioxaborinane) P(HMA‐co‐ViCL) copolymers. The ABn‐type of macromonomers, the crosslinking points formed by the dynamic covalent connection via the associative exchange, and the weak yet dynamic exchange reaction are the three keys to developing high‐performance HBV damping materials. We found that P(HMA‐co‐ViCL) 20k‐40‐60 HBV exhibited ultrahigh energy‐dissipation performance over a broad frequency and temperature range, attributed to the synergistic effect of dense pendant chains and weak dynamic covalent crosslinks. This unique design concept will provide a general approach to developing advanced damping materials.

中文翻译：

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用于超高能量耗散的超支化 Vitrimer

由于分子链的高内摩擦力，聚合物非常适合用作阻尼材料，能够有效抑制各个领域的振动和噪声。目前的策略依赖于拓宽玻璃化转变区域或引入额外的弛豫成分来增强聚合物阻尼材料的能量耗散能力。然而，通过结构控制实现高阻尼效率，同时保持动态特性仍然是一个重大挑战。在这项工作中，我们提出了一种新策略来开发含有密集侧链和松散动态交联网络的超支化玻璃体（HBV）。证实了羧基和硼酸酯之间的新型但弱的动态酯交换反应，并用于制备基于聚（甲基丙烯酸己酯-2-（4-乙烯基苯基）-5,5-二甲基-1,3,2-二氧杂硼烷）P的HBV (HMA-co-ViCL) 共聚物。 ABn型大分子单体、通过缔合交换动态共价连接形成的交联点以及弱而动态的交换反应是开发高性能HBV阻尼材料的三个关键。我们发现 P(HMA-co-ViCL) 20k-40-60 HBV 在较宽的频率和温度范围内表现出超高的能量耗散性能，这归因于致密的侧链和弱动态共价交联的协同效应。这种独特的设计理念将为开发先进阻尼材料提供通用方法。