Mechanical and Thermo-Mechanical Properties of Discontinuously and Continuously Processed Biogenic Wood-Plastic Composites from Polyamide 11 and Chemically Modified Beech Particles

摘要

The resulting mechanical and thermo-mechanical properties of discontinuously and continuously processed biogenic wood-plastic composites (bio-WPC) from polyamide 11 and chemically modified beech particles are investigated. It is found that continuous processing with a twin-screw extruder (TSE) and subsequent industrial scale injection molding leads to a lower elastic modulus, an equal tensile strength, a higher strain at break and a lower glass transition temperature as compared to discontinuous processing with an internal mixer (IM) and subsequent laboratory scale injection molding. This is attributed to a more distinctive beech particle size reduction and shear stress induced chain scission during TSE processing and subsequent injection molding.