Study on the Preparation and Properties of Porous Polyester Elastomer Components via Micro-Extrusion Foaming Stacking
Introducing a porous structure into the interior and surface of polymer elastomers can significantly enhance their elasticity,while also offering advantages such as lightweight,high specific surface area,and multifunctionality.Therefore,researching methods for preparing porous parts that are more economical,environmentally friendly,simple,and capable of meeting diverse needs is of significant importance.Compared to traditional manufacturing techniques,3D printing technology offers greater freedom in shaping,with evident advantages in diverse customization,precision manufacturing,and high-end applications.In recent years,it has been demonstrated that the combination of micro-extrusion foaming with fused deposition modeling(FDM)3D printing technology and high-pressure fluid foaming can achieve in-situ foaming manufacturing of complex three-dimensional porous parts,proving to be an effective method for fabricating porous foamed parts.In this study,micro-extrusion foaming technology was employed to prepare porous thermoplastic polyester elastomer(TPEE)parts with different structures using high-pressure CO2 as a physical foaming agent.The elastic performance of porous parts was systematically studied.The research findings indicate that the introduction of micro-foaming structure can reduce the weight of the products by up to 34.17%,achieving FDM printing-level precision in the length,width,and height directions.Compared to non-foamed parts,the rebound resilience of porous parts significantly increased,while hardness and stiffness greatly decreased.The parts exhibit increased softness and comfort,and higher compressive deformation recovery rate.The introduction of microporous structures into the interior and surface of porous parts prepared using the micro-extrusion foaming stacking molding process enhances the bonding strength between printing layers,resulting in lightweight,improved elasticity,soft touch,and high-precision molding characteristics.This broadens the application scope of porous parts and demonstrates potential application prospects in low-stress and stress-sensitive scenarios.
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