Amide-based oligomers for low-viscosity composites of polyamide 66

Melt viscosity control of polyamides is an important issue concerning polymer processing and quality composites which are directly influenced by the melt viscosity in extrusion and injection molding processes. In this work, a series of linear and cyclic PA6 (nylon6), PA46 (nylon46), and PA66 (nylon66)-based amide oligomers consisting of 30%. This result suggests that proper hydrogen bonding mismatching in the polymer chain network plays an important role for lowering viscosity. A6-L/PA66 composites impregnated with 40 wt% glass fiber show a twofold increase in the melt flow index while maintaining their mechanical strengths.