a) Sketch the typical tensile response (stress vs strain plot) of a semi-crystalline polymer at temperature > Tg. c) Explain in detail what is occurring at the molecular level during the tensile response.b) Below figure shows three stress-strain curves of polymeric materials. Indicate, by letter, the stress-strain behavior expected for a heavily crosslinked polymer. b) d) When excessive tensile stress is applied to polycarbonate, a microstructure showed below develops in the material. Explain this phenomenon. How does this phenomenon contribute to the fracture toughness of a polymer.

10. a) Sketch the typical tensile response (stress vs strain plot) of a semi-crystalline polymer at temperature >Tg. c) Explain in detail what is occurring at the molecular level during the tensile response. b) Below figure shows three stress-strain curves of polymeric materials. Indicate, by letter, the stress-strain behavior expected for a heavily crosslinked polymer. d) When excessive tensile stress is applied to polycarbonate, a microstructure showed below develops in the material. Explain this phenomenon. How does this phenomenon contribute to the fracture toughness of a polymer. (Picture source: https://www.doitpoms.ac.uk/miclib/micrograph_record.php?id=592)