writer：Pengyu Liu, Xiaochuan Ren, Xiaoyan Qiu, Xin Yang, Yuyan Wang, and Xinxing Zhang*
keywords：Self-Healing，Recycled Polyurethanes，Tunable Fluorescence
source：期刊
Issue time：2025年

Recycling of thermoset polyurethanes (PUs) has aroused wide-ranging

concerns. However, degraded thermoset PUs face great challenges in effectively

rebuilding the network for multifunctional upgradation due to random chain breakage.

Herein, we incorporate anionically polymerized poly(maleimide) (PM) into the

reconfigured PU network to achieve improved mechanical and self-healing properties,

and tunable emission of the recycled PU by chain aggregation. The aggregation of PM

or degraded PU fragments via hydrogen bonding interactions forms three main cluster

luminophores, of which the changing relative proportion gives rise to tunable emission

(from blue to green). Meanwhile, hydrogen bonding interactions between the PM and

PU chains serve as sacrificial bonds and dynamic bonds to enhance the mechanical

properties (61.7 MJ/m3, increased by 52 times) and self-healing abilities (86.6%),

respectively. The design of chain aggregation opens up a new perspective for the

multifunctional upgradation of recycled PU and greatly facilitates the value-added

utilization of waste thermoset PUs.