Layer multiplication co‐extrusion of cross‐linked polymer microsphere‐filled systems

Abstract

AbstractLayer multiplication co‐extrusion allows for creation of advance structures with highly tunable properties, with relative ease. Multi‐layer co‐extrusion using the layer multiplication technique was used to create 33‐layered structures of polymer microsphere‐filled layers alternating with unfilled layers. Cross‐linked polyurethane (PU) microspheres (of two different rigidities) and ultra‐highly cross‐linked polymethylmethacrylate (PMMA) microspheres were used to examine the effect of particle rigidity in confinement on overall mechanical properties. Layer structures were successfully created with particle‐filled layers; once layer size approaches the particle size, the particles deform the unfilled counter‐layer. In certain conditions, impingement of the counter‐layer occurs, decreasing the mechanical properties. High‐density polyethylene‐grafted‐maleic anhydride (HDPE‐g‐MA) was subsequently utilized as a compatibilizer to improve the interface between the particles and the matrix. The HDPE‐g‐MA was effective in increasing the mechanical performance of the co‐extruded product made with the PU microspheres but inefficient in improving the product made with the PMMA microspheres.