The fabrication of weldable and recyclable polyolefin bead foams remains a great challenge. Here, we report a convenient pathway to transform polyolefin elastomer (POE) into vitrimers based on classical ester-hydroxyl transesterification through reactive extrusion. The dynamic behaviors and mechanical properties of POE vitrimers could be readily regulated by varying the dosage of the cross-linker. POE vitrimer bead foams are prepared by a simple and feasible free foaming technology. We suggest two approaches to reprocess and recycle POE vitrimer bead foams by weld-compression molding and re-foaming. POE vitrimer bead foams could be well bonded with adjustable cell density and performance through weld-compression molding strategy. The dynamic transesterification can not only promote the fusion of foam beads, but also induce the fusion of contact buckling cell walls under compression. This investigation would motivate further sustainable development in the designing and recycling of polymer bead foams.

可焊接和可回收的聚烯烃珠状泡沫的制造仍然是一个巨大的挑战。在这里，我们报告了一种基于经典酯-羟基酯交换反应通过反应挤出将聚烯烃弹性体 (POE) 转化为玻璃体的便捷途径。通过改变交联剂的剂量，可以很容易地调节 POE 玻璃体的动态行为和机械性能。POE玻璃体珠泡沫是通过简单可行的自由发泡技术制备的。我们建议通过焊接压缩成型和再发泡两种方法来再加工和回收 POE 玻璃体珠粒泡沫。POE玻璃体珠粒泡沫可以通过焊接压缩成型策略以可调的泡孔密度和性能很好地粘合。动态酯交换不仅可以促进泡沫珠的融合，但也会在压缩下诱导接触屈曲细胞壁的融合。这项调查将推动聚合物珠泡沫设计和回收的进一步可持续发展。