Wear and microplastic generation from polyethylenes

Polymers are most widely used in packaging applications. In particular, linear low density polyethylenes (LLDPE) are widely used in flexible packaging applications. LLDPEs are copolymers of polyethylene that incorporate comonomers to control the degree of crystallinity. This governs the flexibility and tear resistance of the packaging. The influence of comonomer content in determining the formation of microplastics has not yet been investigated. In this project, a series of LLDPEs with similar molecular weight and systematic variation in the comonomer content will be investigated using a pin on disc system. The mechanism by which these wear, and the characteristics of the microplastic particles generated will be analyzed. This project is largely experimental and will be co-supervised by Prof Aparna Singh (MEMS), who is an expert on wear and tribology. There are no specific prerequisites for students who opt for this project - some exposure to polymer science will be advantageous but is not required. The student will learn to use several characterization tools for polymers, as well as tribological techniques. They will be encouraged to take some courses in polymer science, and in particular polymer physics and engineering.