Polycarbonate is a clear, hard and tough plastics used to make shatterproof windows and safety goggles, while polyethylene is a soft, flexible materials used in the production of plastic bags. The glass transition temperature of polycarbonate is around 147 oC, while the glass transition temperature and the melting temperature of polyethylene are around -100 oC and 100 oC, respectively. a) Explain the flexibility/rigidity of polycarbonate and polyethylene in terms of their glass transition temperature and melting temperature b) How the melting temperature and glass transition temperature affect the selection of polymers for the product design?

4. Polycarbonate is a clear, hard and tough plastics used to make shatterproof windows and safety goggles, while polyethylene is a soft, flexible materials used in the production of plastic bags. The glass transition temperature of polycarbonate is around 147C, while the glass transition temperature and the melting temperature of polyethylene are around 100C and 100C, respectively. a) Explain the flexibility/rigidity of polycarbonate and polyethylene in terms of their glass transition temperature and melting temperature b) How the melting temperature and glass transition temperature affect the selection of polymers for the product design