Abstract
The fiber type, orientation of the fiber, fiber-matrix adhesion, and the fiber length are very important for the performance of a short fiber reinforced plastic. Hybrid reinforced polybutylene terephthalate and reference compounds were tested using tensile, Charpy impact, and three-point bending mechanical tests. The interaction of regenerated cellulose fiber and glass fiber was investigated using a polybutylene terephthalate matrix at a fiber volume content of 10%. The ratios of each fiber type was varied. The compounds were pultruded with an extrusion die to have an even fiber length of 3 mm after granulating. In a second step, the specimens were injection molded for mechanical testing. The results were compared to the rule of hybrid mixtures (RoHM) prediction. It was shown that the results of the hybrid reinforced compound were close to the RoHM prediction. The Charpy impact tests show a high positive hybrid effect. The fiber length shows an interaction that is dependent on the ratio of each fiber type.
Highlights
Thermoplastics reinforced with glass fiber (GF) are used for products where a low weight, low cost, and high thermomechanical properties are required [1]
Man-made cellulose fibers are used to reinforce a polymer matrix. They are made of regenerated cellulose (RCF) and they are sensitive to high processing temperatures
The results show the fiber length of RCF and GF in each composition
Summary
Thermoplastics reinforced with glass fiber (GF) are used for products where a low weight, low cost, and high thermomechanical properties are required [1]. Zarges et al have shown that the critical fiber length for a GF in combination with PP can be influenced by the addition of a coupling agent. This decreases the fiber length due to a stronger bond with the matrix [5]. Man-made cellulose fibers are used to reinforce a polymer matrix They are made of regenerated cellulose (RCF) and they are sensitive to high processing temperatures. Due to a very short exposure time of the fibers to a processing temperature above 200 ◦C, the pultrusion of RCF with, for example, polyamide, was shown in a publication of Feldmann et al [8,9]. Reinforcing plastics with two types of fibers opens up new possibilities in the development of the mechanical properties of a composite [10]. The interaction of the two fiber types will be investigated in this publication
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