Thermoplastics refer to plastics that soften when heated and harden when cooled. Most of the plastics we use in our daily lives belong to this category. When heated, they soften and flow, and when cooled, they harden. This process is reversible and can be repeated.
Thermoplastics are not equal to thermosetting plastics.
Thermoplastics and thermosetting plastics are two main different types of plastics.
The characteristics of thermoplastics are:
When heated, they soften and deform, and when cooled, they harden back to their original shape. This process can be repeated many times.
The molecular structure is linear or branched, and there is only a weak van der Waals force between molecules, and there is no chemical cross-linking.
Representative thermoplastics include polyethylene, polypropylene, polystyrene, polyvinyl chloride, etc.
The characteristics of thermosetting plastics are:
When heated, an irreversible chemical reaction will occur, causing its molecules to form a three-dimensional cross-linked network structure, which will no longer soften and deform.
There are covalent bonds between molecules to form a stable three-dimensional network structure.
Representative thermosetting plastics include phenolic resin, epoxy resin, polyester resin, etc.
In general, thermoplastics are plastic and recyclable, while thermosetting plastics have high strength and heat resistance, and both have important applications in the plastics industry.
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Post time: Jun-03-2024