Chapter 15 & 16 Notes

Chapter 15 & 16 Notes - C hapter 15 POLYMER TYPES...

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Chapter 15 POLYMER TYPES Plastics Materials that have some structural rigidity under load Classified as either thermoplastic or thermosetting Linear or branched polymers must be used below their glass transition temperature Elastomers Have the ability to deform to large deformations and elastically spring back to their original form Results from cross links in the polymer that provide a force to restore the chains to their undeformed conformations Unstressed state = crosslinked molecular chains that are highly twisted kinked, and coiled Must not easily crystallize China bond rotations must be relatively free for coiled chains to readily respond to an applied force Must be above glass transition temperature Vulcanization – adding sulfur compounds to heated elastomer -> chains of sulfur atoms bond with adjacent polymer backbone chains and crosslink them o Increases modulus of elasticity, tensile strength, and resistance to degradation by oxidation Fibers
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