What are three factors operating at a molecular level that affect the bulk properties of a plastic?
1. Plastics have a lower density than that of metals, so plastics are lighter than metals. Most plastics vary in density from 0.9 to 2.2 g/cm3, compared to steel (7.85 g/cm3.
2. Plastics are polymers, in some cases made up of repeating units of over 200,000 carbon atoms, e.g. polyethylene. Such long chains give plastics unique properties that differ from other materials that are made of shorter crystalline structures. Very long ...
A discussion of intramolecular bonds, properties of polymer molecules, and thermoplastics.