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Polymer Bead Foams: A Review on Foam Preparation, Molding, and Inter-Bead Bonding Mechanism
Summary
This review examines the preparation, molding, and inter-bead bonding mechanisms of polymer bead foams, providing a comparative analysis of foam characteristics across distinct polymer types including expanded polypropylene, polyethylene, and polylactic acid. The authors survey traditional molding processes such as steam-chest molding and adhesive-assisted molding alongside emerging techniques like in-mold foaming and microwave sintering, discussing the multi-scale structural features that govern bead foam performance.
The diverse physical appearances and wide density range of polymer bead foams offer immense potential across various applications and future advancements. The multi-scale and multi-level structural features of bead foams involve many fundamental scientific topics. This review presents a comprehensive overview of recent progress in bead foams preparation and molding techniques. Initially, a comparative analysis is conducted among bead foam characteristics of distinct polymers, based on their unique properties. Subsequently, a summary and comparison of molding processes employed for fabricating bead foam parts are provided. Beyond traditional methods like steam-chest molding (SCM) and adhesive-assisted molding (AAM), emerging techniques like in-mold foaming and molding (IMFM) and microwave selective sintering (MSS) are highlighted. Lastly, the bonding mechanisms behind the diverse molding methods are discussed.
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