Question

5) Rank the following polymers in terms of the listed properties from 1 (lowest value) to 5 (highest value). Explain the results. 19 -C-C- (Highly Cross- Liaked Structure) -C-C- -C-C- Polyethylene Epoxy Polyvinyl Chloride Polystyrene Chloride Tensile Strength Tensile Use Temperature Stiffness Polyethylene Epoxy Polyvinyl Chloride Polystyrene Polyvinylidene Chloride

Answer 1

Stiffness Tensile use |_strength Tompeiature Polyethylene Ерота. I polyvinyl chloride polystyrene pdy vinylidene chloride Explanation A) stiffness • Epoxy is highly cross linked. So among the aborre polymers it has highest stiffness In case of polystyrene presence of benzene ring in chain backbone makes it stiffer than albov Polymes excer+ ероту. In case of polyvinylidene chloride 2 are two and one chlorine ap repost group respectively. so stiffness order is so as mentioned. In polyethylene there is no bulky group in its Chain backbone. so it is less Stiffer among all polymers mentioncol. < pvc, there alyvinylidene Chlevicke B) Tensile strengia we know tensile strength is proportional to same as stiffness excer Stiffness. so the order is e) use Temperature · Epoxy is highly crosslinked. So it withstands at high temperature. Thus it can be used at very high temperature Having a benzene ring in backbone of polystyrene it is used at high temp polyvinylidene chloride a puc can be wed much less temp than above two polymers. polyvinylidene chloride can be used relatively high temperature due to two cliente chlorine group There is no bulky or present in darger functional polyethylene, so it group relatively low can be used temperature among an mentioned above. polymers