POS1-0877
Depolymerizable Polyurethane Hot-Melt Adhesives for Controlled Debonding
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Yewon Kang (CHONNAM NATIONAL UNIVERSITY)
Co-Author(s)
Abstract
Adhesives facilitate the assembly of multi-material products but often hinder the selective separation and recovery of their constituent materials after use. In particular, removing conventional hot-melt adhesives (HMAs) may require heating, harsh solvents, or mechanical force, potentially causing substrate damage and reducing the quality of recovered materials. To address these limitations, we developed a polyurethane (PU) HMA that maintains adhesion during use while undergoing backbone depolymerization in response to a specific chemical stimulus, thereby enabling selective debonding at room temperature.
The resulting PU was processed into a flexible, low-tack film suitable for convenient handling and thermal bonding. Exposure to fluoride induced backbone depolymerization and loss of adhesion, enabling the separation of mixed plastics and the dismantling of carbon-fiber-reinforced polymer assemblies. The recovered depolymerization products were subsequently converted into an upcycled polyurea that formed a flexible, free-standing film, demonstrating the potential for further utilization of the recovered polymer components.
By integrating selective debonding, component recovery, and chemical reuse of the depolymerization products, this study presents a circular adhesive strategy that supports both product disassembly and continued material utilization.
The resulting PU was processed into a flexible, low-tack film suitable for convenient handling and thermal bonding. Exposure to fluoride induced backbone depolymerization and loss of adhesion, enabling the separation of mixed plastics and the dismantling of carbon-fiber-reinforced polymer assemblies. The recovered depolymerization products were subsequently converted into an upcycled polyurea that formed a flexible, free-standing film, demonstrating the potential for further utilization of the recovered polymer components.
By integrating selective debonding, component recovery, and chemical reuse of the depolymerization products, this study presents a circular adhesive strategy that supports both product disassembly and continued material utilization.
