Thermosetting polymers have poor ductility and impact properties because of. Select one: a. - their poor strength, stiffness, and hardness b. - the absence of cross-links among their polymeric chains c. - the reversible cross-linking of their structure d. - the easy rotation and slide of their polymeric chains under increasing applied load e. - their high glass-transition temperature
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What is a glass-transition temperature? The glass-transition temperature (Tg) is the temperature at which an amorphous material transitions from a hard, brittle state to a more flexible, rubbery state. It is the temperature at which the material undergoes a phase Show more…
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a) Polymer glass transition temperature ($T_g$) can be described as a temperature range at which polymer transition from a rigid glassy state to a soft rubbery state. $T_g$ of polymer are highly dependent on chain structure, polymer backbone and functional group of the polymers. Compare and rank $T_g$ values of the following polymers? Provide justification and explanation for your selection? (4 marks) (CO3, C2) i) Case I. polyethylene, polypropylene and polystyrene ii) Case II. polypropylene and polyvinyl chloride
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