There are basically two types: the first one is a linear structure, the polymer compound having such a structure is called a linear polymer compound; the second is a bulk structure, and the polymer compound having such a structure is called a bulk polymer. Compound. Some polymers have a branch, called a branched polymer, and belong to a linear structure. Some polymers have cross-linking between molecules, but cross-linking is less. It is called a network structure and belongs to a body structure.
Two different structures exhibit two opposite properties. Linear structure, heating can be melted, hardness and brittleness are small. The body structure has a large hardness and brittleness. Plastics are made of two kinds of polymers. Thermoplastics are made of linear polymers, and thermosetting plastics are made of bulk polymers.