Conference proceedings
Influence of the compounding process on bio-based polyamides with cellulosic fibers

Publication Details
Zarges, J.; Feldmann, M.; Heim, H.
30th Polymer Processing Society
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Bio-composites based on thermoplastic polymers and cellulosic fibers have become more popular since the last decade. This is due to higher crude oil prices, and a rising demand for sustainable materials from renewable resources. Furthermore, the utilization of bio-based engineering polymers as a matrix material for such composites has become an important focus in materials research. In addition to the aspect of sustainability, the bio-based materials provide an advantage for lightweight applications with their lower density. Nowadays, NFCs (natural fiber composites) are made of cellulosic fibers, and mainly polyolefin polymers, because of the required lower processing temperatures. In this investigation, the completely bio-based polyamide 10.10 with a melting point above 200 °C was used as a polymer matrix. Several chopped cellulosic fibers were investigated as reinforcement for use in injection molded parts. A corotating twin-screw extruder with a screw diameter of 18 mm, and a gravimetric feeding system were used for compounding. The difficulties of compounding such composites arise due to the thermal sensitivity of the cellulosic fibers, and the high melting temperature of the investigated polyamide. It was verified that reinforcement with cellulosic fibers is basically possible, and that it results in an increase of mechanical properties. The compounds with PA 10.10 and 30 wt{\%} cellulosic fibers achieve 38{\%} higher notched impact strengths than compounds with 30 wt{\%} glass fibers. It was shown that the mechanical properties of the compounds depend on the type as well as on the amount of cellulosic fibers used.


Last updated on 2019-05-12 at 15:27