Plastic molds are considered very important tools in modern industry, so this course is a guide to learn about the plastic industry and the molds used in this regard
5. The word ‘polymer’ comes from the Greek words
poly (meaning ‘many’) and meros (meaning ‘parts’).
Polymers are very large molecules made when hundreds of
monomers join together to form long chains.
Plastics are synthetic polymers that
can be shaped by heat or pressure.
9. Lined-up chains make
plastics dense, rigid and
harder to melt
(e.g. high-density
polyethene).
The properties of a plastics depend on how the polymer
chains are arranged:
Branching chains
make plastics light,
soft and easy to melt
(e.g. low-density
polyethene)