Vitrimers are covalent adaptable networks, having many interesting versatile abilities with unprecedented potentials. Here, the combination of a low‐T_g polymer system with dioxaborolane metathesis is used to develop catalyst‐free vitrimers that can be stretched to more than 8900× their original length at a moderate stretching rate (≈50 mm min⁻¹). Superstretchable vitrimers are prepared from biodegradable xylitol‐based polyol oligomers and cross‐linked by dioxaborolane linkages. They are also found to be remarkable in terms of mechanical strength and other properties, such as malleability, self‐healing ability, puncture resistance, and processing stability. Furthermore, the repeated rearrangements of dioxaborolane linkages and hydrogen bonds give rise to efficient energy dissipation with a maximum efficiency of 88%, allowing the superstretchable vitrimers to be promising for energy absorbing applications.

中文翻译：

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极易拉伸的微晶玻璃。

陶瓷是共价适应性网络，具有许多有趣的通用功能，具有空前的潜力。在这里，低T _g聚合物体系与二氧杂硼烷易位的结合被用于开发无催化剂的三聚体，可以在中等的拉伸速率下（≈50mm min ^-1）拉伸至原始长度的8900倍以上。）。超可拉伸的三聚体由可生物降解的木糖醇基多元醇低聚物制得，并通过二氧杂硼烷键交联。还发现它们在机械强度和其他性能（例如延展性，自愈能力，抗穿刺性和加工稳定性）方面非常出色。此外，二氧杂硼杂环戊烷键和氢键的重复重排导致有效的能量耗散，最大效率为88％，这使得超可拉伸的三聚体有望用于能量吸收应用。