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Moreover, HDPE has a long shelf life and lower environmental impact because it may come from recycled plastic. High-density polyethylene (HDPE) is a thermoplastic that has a relatively low tensile modulus, low density and more uses in the automotive industry as a composite due to its lighter weights than the materials traditionally used, which positively affects fuel consumption.In addition, HDPE manufacturing is much simpler and faster than that of other types of materials. There are many different thermoplastic matrix composites used in the automotive industry, and the most common are thermoplastic polyurethane (TPU), polypropylene (PP), polyethylene (PE) and polystyrene (PS). Thermoplastic composites are increasingly important because of their advantages, such as light weight, high fatigue strength, corrosion resistance and electrical insulation. The strength of the produced composite mainly depends on the ratio between the polymer matrix and the added material in the composite content. Thermoplastic composites are wonder materials that can be defined as hybrids of materials consisting of two phases: the polymeric matrix phase holds the dispersed phase (reinforcement phase) and shares a load with this phase however, the two phases could be different in chemical and physical properties and separated by a distinct interface. This study recommends that the prepared composite, under optimum conditions, can be used as a cost-effective automobile dashboard material. The composite, which was prepared under ideal conditions, has high thermal stability and can be easily recycled and reprocessed for five cycles with high mechanical properties. However, the elongation at the break decreased with the increase in both factors. The results showed that superior mechanical properties were obtained and that the tensile strength and modulus increased with increasing waste glass powder content and compatibilizer concentration by 20 and 1.5 wt%, respectively. The effect of adding waste glass powder and compatibilizer concentration on the composite's mechanical properties, such as tensile strength, tensile strain, tensile modulus and thermal properties was studied.
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Four levels of waste glass powder, 2, 10, 20 and 30% by weight, and five levels of the compatibilizer, polyethylene grafted with maleic anhydride (0.5, 1.5, 2.5, 5 and 7.5%by weight), were used. In this work, recycled high-density polyethylene/waste glass powder composites, compatibilized with maleic anhydride-grafted polyethylene, were prepared using a two-roll mill and compression molding techniques. Several reinforcement materials are incorporated into a polymeric matrix to improve the mechanical properties and reduce the cost of the obtained composites.