Thermoplastic Hybrid Composites with Wood Fibers: Bond Strength of Back-Injected Structures

  • Due to their lightweight potential and good eco-balance, thermoplastic hybrid composites with natural fiber reinforcement have long been used in the automotive industry. A good alternative to natural fibers is wood fibers, which have similar properties but are also a single-material solution using domestic raw materials. However, there has been hardly any research into wood fibers in thermoplastic back-injected hybrid composites. This article compares the bond strength of an injection molded rib from polypropylene (PP) and wood fibers to different non-wovens. The non-wovens consisted of wood fibers (spruce) or alternatively natural fibers (kenaf, hemp), both with a polypropylene matrix. Pull-off and instrumented puncture impact tests show that, given similar parameters, the natural and wood-fiber-hybrid composites exhibit very similar trends in bond strength. Further tests using viscosity measurements, microscopy, and computed tomography confirm the results. Wood-fiber-reinforced thermoplastic hybrid composites can thus compete with the natural fiber composites in terms of their mechanical behavior and therefore present a good alternative in technical semi-structural applications.
Author:Frederik Obermeier, Peter Karlinger, Michael Schemme, Volker Altstädt
Parent Title (English):Materials
Document Type:Article (peer reviewed)
Publication Year:2022
Tag:back-injection molding; biocomposites; bond strength; polypropylene; wood fibers
First Page:2473
Peer reviewed:Ja
Project Title:Prozess- und Materialtechnische Untersuchungen von Hybridverbundstrukturen mit nachwachsenden Rohstoffen in Form von Natur- und Holzfasern
Funding Agency:BMBF
Grant Number:13FH069PX6
faculties / departments:Fakultät für Ingenieurwissenschaften
Dewey Decimal Classification:6 Technik, Medizin, angewandte Wissenschaften / 60 Technik / 600 Technik, Technologie