Abstract
The reinforcement and matrix of a polymer material can be composited into a single polymer composite (SPC), which is light weight, high strength, and has easy recyclability. The insert injection molding process can be used to realize the multiple production of SPC products with a short cycle time and wide processing temperature window. However, injection molding is a very complicated process; the influence of several important parameters should be determined to help in the future tailoring of SPCs to specific applications. The effects of varying barrel temperature, injection pressure, injection speed, and holding time on the properties of the insert-injection molded polypropylene (PP) SPC parts were investigated. It was found that the sample weight and tensile properties of the PP SPCs varied in different rules with the variations of these four parameters. The barrel temperature has a significant effect, followed by the holding time and injection pressure. Suitable parameter values should be determined for enhanced mechanical properties. Based on the tensile strength, a barrel temperature of 260 °C, an injection pressure of 127.6 MPa, an injection speed of 0.18 m/s, and a holding time of 60 s were determined as the optimum processing conditions. The best tensile strength and peel strength were up to 120 MPa and 19.44 N/cm, respectively.
Highlights
Single-polymer composite (SPC) is a composite material whose reinforcement and matrix are from the same type of polymer
SPC possesses the advantages of low density, good interfacial compatibility, high strength, and easy recyclability [1,2,3]
The preparation methods of SPC products are mainly based on compression molding [1,2,3,4], such as the hot compaction of polymer fibers/tapes/fabrics, film stacking, co-extrusion combined with compression
Summary
Single-polymer composite (SPC) is a composite material whose reinforcement and matrix are from the same type of polymer. The compression molding method for SPC production has many disadvantages, such as a narrow temperature window, the difficult controlling of processing temperature, a long molding cycle, and low efficient production. In order to overcome these disadvantages, injection molding is a potential method to be used in the preparation of SPCs. Injection molding is an effective method for the rapid batch molding of plastic products. Injection molding is an effective method for the rapid batch molding of plastic products It plays an important role in the molding of the products of short/long glass/carbon/nature fiber reinforced polymer composites [5]. The reinforcement of the same polymer as the matrix material would be molten during the injection molding processing, and the reinforcement effect would disappear
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