Abstract

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This research investigates the impact of glass fiber content on the mechanical, morphological, physical, and dynamic mechanical properties of polypropylene (PP) composites. The selection of PP and glass fiber is driven by their widespread availability, favorable mechanical characteristics, and cost-effectiveness. The study involves the fabrication of glass fiber-reinforced PP composites using a Carver Press Model with a fiber loading range of 13% to 22%. The following properties were evaluated for the composites with 18% fiber loading: Tensile strength: 55.2 MPa, Tensile modulus: 989.1 MPa, Flexural strength: 64.47 MPa, Flexural modulus: 1970.58 MPa, Impact strength: 28.76 kJ/m², Density: 1.038 g/cm³, Water absorption: 0.274%. Dynamic mechanical analysis (DMA) revealed poor fiber-matrix adhesion at elevated temperatures and high damping characteristics. Scanning electron microscopy (SEM) micrographs further confirmed the presence of delamination, matrix rupture, and fiber breakage within the composite. Based on the improved properties observed in the study, particularly increased tensile and flexural strength and modulus, polypropylene composites with optimized glass fiber content could be suitable for various applications such as Automotive components, Construction materials, Sporting goods, and Consumer electronics. Overall, with further optimization, polypropylene composites with tailored glass fiber content have the potential to find applications in various industries requiring lightweight, strong, and cost-effective materials.

Keywords: Polypropylene, Glass fibre, DMA, SEM