MatE 215 Lab 6: Polymer Tensile Testing (Fall 06) Page 1 of 11 Laboratory 6 Polymers: Structure-Property Relationships with Tensile Testing Goal: To relate how a polymer’s mechanical strength and ductility are linked to its molecular structure and to predict & explain the transition in strength above the glass transition temperature. Learning Objectives: 1.Define a polymer, and give some properties and applications of polymers. 2.Give situations or applications in which a polymer might be used to replace a metal or ceramic. 3.Discuss how the bondingwithinthe molecular chains vs. betweenthe chains can affect properties. 4.Sketch, model, and describe the molecular structure (e.g., bonding, pendant groups) of polyethylene, polycarbonate, and polystyrene. 5.Explain how the structureof a thermoplastic affects its mechanical properties. 6.Rank the relative mechanical properties (such as stiffness, strength and ductility) of different polymers, based on their structure. 7.Explain the changes that take place at and then above the glass transition temperature(Tg) for thermoplastic polymers. 8.Identify the elastic modulus, yield strength, and % elongationfrom tensile testsof materials.
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