Slide 1
Carbon bonds can form chains, branches and rings
Carbon commonly forms four covalent bonds and can bond to other carbon atoms. This allows chains, branches and rings.
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The same element can therefore support a large range of molecular frameworks. Adding oxygen, nitrogen or other atoms introduces further chemical functions without removing the underlying carbon skeleton.
Slide 2
Single, double and triple bonds change shape and reaction
Single, double and triple carbon bonds differ in electron sharing and geometry. These differences influence how a molecule can bend and react.
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Rotation around a typical carbon–carbon single bond is much easier than rotation around a double bond. Restricted rotation can preserve distinct spatial arrangements that have different physical and chemical properties.
Slide 3
Repeated units form long polymers
A polymer contains many linked molecular units. Its properties depend on the repeat structure and how the long chains are arranged.
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Chains can differ in length even within one sample, giving a distribution of molecular masses. Reporting only one average can hide variation that affects processing, strength or flow.
Slide 4
Branches and crosslinks change how chains move
Branches and crosslinks change how polymer chains move past one another. The same broad chemical family can therefore produce very different materials.
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A network of crosslinks can help a stretched material return toward its original shape. Too many constraints can instead reduce flexibility, so useful behaviour depends on the degree and kind of connection.
Slide 5
Structure and processing matter more than the natural label
A carbon-based material may be natural or manufactured. Its behaviour follows molecular structure and processing, not the label alone.
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Cellulose, proteins and many plastics are all polymers, yet their repeat units and interactions differ greatly. Predicting degradation or reuse requires examining those specific bonds and conditions rather than assuming all polymers behave alike.
Sources
- Moses Gomberg and the Discovery of Organic Free Radicals
American Chemical Society
- Natural Resources and Synthetic Materials
American Chemical Society