Work

Catalyst‐free reprocessable crosslinked biobased polybenzoxazine‐polyurethane based on dynamic carbamate chemistry

Year: 2022

Type: article

Abstract: The introduction of dynamic covalent chemistry into the field of polymer chemistry has resulted in a new class of network polymer materials named covalent adaptable networks (CANs). These new materials have effectively bridged two antagonistic materials, that is, conventional thermoplastic and thermoset polymers together, thanks to these dynamic exchangeable covalent bonds, making them recyclable. In this work, we report a catalyst‐free reprocessable polybenzoxazine‐polyurethane thermosetting system with activation of carbamate dynamic bond exchange. The curing characteristics and properties of this biobased polybenzoxazine‐polyurethane network have been determined by Fourier transform infra‐red (FTIR), differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMA). Moreover, the tests of the recyclability of the material were successfully achieved under mild reprocess conditions (130°C, 10 min) thanks to the formation of abundant free phenolic hydroxyl groups. This work provides a promising potential for industrial applications as a new recyclable and reprocessable thermosetting polybenzoxazine material.

Source: Journal of Applied Polymer Science

DOI: 10.1002/app.52120

Authors: Zhibin Wen, Leïla Bonnaud, Philippe Dubois, Jean‐Marie Raquez

Institutions: University of Mons, Chinese Academy of Sciences, Shenzhen Institutes of Advanced Technology, Materia Nova, Shenzhen Institute of Advanced Electronic Materials

Language: English

Topic: Polymer composites and self-healing

Subfield: Polymers and Plastics

Field: Materials Science

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: green

Funder: Interreg