Rheological behavior of coextruded multilayer architectures

• Published in: Journal of materials science Vol. 37; no. 6; pp. 1259 - 1264
• Main Authors: BEEAFF, D. R, HILMAS, G. E
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 15.03.2002; Springer Nature B.V
• Subjects: Applied sciences; Coextrusion; Composites; Exact sciences and technology; Extrusion; Forms of application and semi-finished materials; Materials science; Multilayers; Polymer blends; Polymer industry, paints, wood; Rheological properties; Rheology; Shear rate; Technology of polymers; Thickness; Viscosity; Stress strain relation; Synthetic fiber; Fiber reinforced material; Sandwich structure; Mechanical properties; Temperature effect; Shear strength; Compressive strength; Aluminium alloy; Experimental study; Composite material; Honeycomb structure; Aramid fiber; Phenoplasts; Woven material; Fracture mode
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1023/A:1014392111303

Utilizing a thermoplastic extrusion process, a multilayered architecture was fabricated. Thermoplastic blends of 55 vol% X7R dielectric and 50 vol% nickel powder were prepared by high shear mixing. Sheets pressed from this material were cut, stacked, and laminated to produce multilayered blocks. The blocks were extruded through a slotted spinneret to reduce layer thickness. The relation between viscosity and shear rate is relatively well understood for two- or three-layered polymer coextrusion. This behavior has not been studied for heavily loaded multi-component systems, such as might be used for MLCCs and other multilayered devices. A correlation was observed between the flow behavior during extrusion and that observed during mixing. Results show how control of the rheological behavior of highly loaded systems can control extrusion defects.