It is appealing to develop dynamic polymer systems with multifunctionl properties. Herein, we report a polyurethane elastomer with a dynamic covalent polymer network containing a radically exchangeable 2-arylindane-l,3-dione dimer as thermally sensitive and reversible cross-links. In addition, the carbolong complex, an excellent photothermal agent, is incorporated into the dynamic network backbone. With the irradiation of NIR light, the carbolong complex rapidly generates thermal energy, which subsequently triggers the cleavage of the dynamic covalent bond to generate radicals and activate the polyurethane network. In proof-of-concept experiments, we demonstrate that the utility of a combination of radically exchangeable covalent bond and carbolong moiety brings multiple functional characteristics to the polymer network with a capability of spatiotemporal control, including thermochromism, photochromism, rewritability, malleability, and self-healing. This study holds potentials for exploring more tunable dynamics and improved material properties.

中文翻译：

---

自由基可交换共价键和Carbolong络合物介导的动态聚合物网络系统

开发具有多功能特性的动态聚合物系统具有吸引力。在此，我们报道了一种具有动态共价聚合物网络的聚氨酯弹性体，该网络包含可自由基交换的 2-芳基林丹-l,3-二酮二聚体作为热敏和可逆的交联键。此外，将优异的光热剂carbolong络合物纳入动态网络主干。随着近红外光的照射，carbolong 复合物迅速产生热能，随后引发动态共价键的断裂，产生自由基并激活聚氨酯网络。在概念验证实验中，我们证明了自由基可交换共价键和carbolong部分组合的效用为聚合物网络带来了多种功能特性，具有时空控制的能力，包括热致变色、光致变色、可重写性、延展性和自愈性。这项研究具有探索更多可调动力学和改进材料性能的潜力。