Spandex Structure and Properties
Notice that because Spandex is a polymer, its macromolecular structure is made up of repeating units (mers) denoted by the x and n next to the parentheses in the structure. Each Spandex fiber will differ somewhat in length and composition depending on the exact values of x and n.
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Expanded Structure: |
Functional Groups: |
Hybridization and Geometry: |
Resonance Structures: Functional groups that have resonance contributors (and thus double-bond character) will have higher barriers to rotation. Find the urethane and urea derivative functional groups in the structure above and show how the carbonyl group and the adjacent heteroatom can be drawn as another resonance structure. |
Conformational Analysis: Here is a small Spandex molecule in one possible conformation. |
Dependence of Physical Properties on Structure: |