Investigation of Thermomechanical and Flammability Behaviors of Hemp/Polypropylene Reinforced Polylactic Acid Composites

This paper discusses the fire and heat resistance of a polylactic acid/Hemp/Polypropylene hybrid laminated composite. Hybrid composites had their impacts analysed, specifically with regards to the fibre composition and stacking order. Using a hot press, the hybrid composites were created. In this work, Hemp/Polypropylene-reinforced polylactic hybrid composites with thermogravimetric, differential calorimetric, dynamic mechanical, and flamability properties were reported. Thermomechanical studies show that hybridization affects the laminate’s viscoelastic characteristics and thermal stability. Hybrid composites' burning rates were also evaluated for this flammability test. Most of the Hemp layers in sample C7 had the most char residue (10%), while sample C8 had the highest decomposition temperature (450°C). When it comes to hybrid composites, however, the C5 sample offers the best results, with a large char production and a low burning rate of just 36 mm/min. Also, viscoelastic properties like storage and loss modulus are best in class for the C5 sample, which is a hybrid composite. Keywords: Hemp; flammability Polypropylene; PLA; TGA; DSC.