Abstract Distinct bismaleimides (BMIs) of differing molar masses and chemical architectures were studied as cross-linkers of different polyurethane (PU) backbones containing pendant furan rings to form responsive biobased networks via the Diels-Alder (DA) reaction. The pendant furan rings were introduced during PU synthesis by the inclusion of a specific diol structure with furan groups and derived from oleic acid. The diol is denoted as the Furan Oligomer (FO) and its synthesis can respect green chemistry principles. The effects of varying the proportions of FO in cross-linked systems as well as the type of BMIs (aliphatic vs. aromatic) were particularly studied. The corresponding materials were fully analyzed through several complementary approaches to evaluate their physical, chemical and thermal properties and behaviors. PUs cross-linked by an aromatic BMI yield superior mechanical properties, whereas the chain length and structure clearly influenced the swelling, reprocessability and heat-induced healing of the networks. The introduction of hard segments (HS) into the PU backbone was also examined in terms of micro-segregation. The effect of hydrogen bonding linked to HS in combination with the cross-links by DA would yield superior mechanical properties with good thermal recyclability and self-healing behaviors, to develop materials for advanced applications.

中文翻译：

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通过点击化学交联的响应性生物基聚氨酯网络的合成和行为：交联剂和主链结构的影响

摘要 研究了不同摩尔质量和化学结构的不同双马来酰亚胺 (BMI) 作为含有呋喃侧环的不同聚氨酯 (PU) 主链的交联剂，通过狄尔斯-阿尔德 (DA) 反应形成响应性生物基网络。通过包含具有呋喃基团并衍生自油酸的特定二醇结构，在 PU 合成过程中引入了悬垂的呋喃环。二醇表示为呋喃低聚物 (FO)，其合成符合绿色化学原则。特别研究了在交联系统中改变 FO 比例以及 BMI 类型（脂肪族与芳香族）的影响。通过几种互补的方法对相应的材料进行了全面分析，以评估它们的物理、化学和热性能和行为。由芳香族 BMI 交联的 PU 具有优异的机械性能，而链长和结构明显影响了网络的膨胀、可再加工性和热诱导愈合。硬链段 (HS) 引入 PU 主链的情况也在微观偏析方面进行了检查。与 HS 连接的氢键与 DA 的交联结合的作用将产生具有良好热回收性和自修复行为的优异机械性能，从而开发用于高级应用的材料。