Polymers are useful engineering materials and are used extensively in almost all walks of life worldwide because of their outstanding engineering properties such as low densities, good strength-to-weight ratios, toughness, and resistance to corrosion, ease of processing, design freedom, and most importantly low-cost and global availability. These factors lead to the high production of polymers. Despite their engineering significance, single-use plastics are becoming a major concern due to the environmental perils associated with the use-and-discard mindset. This thesis work explores the possibility of utilizing post-consumer recyclates of polypropylene (PP) and polyethylene terephthalate(PET) to develop microfibrillar composites (MFCs) that can be used for high-end applications. This process makes use of discarded, single-use plastic materials and renders them into useful engineering products that no longer provide hazards to the environment furthermore such composite materials are completely recyclable in comparison to their conventional counterparts made by incorporation of inorganic fillers.