The first type is a linear structure, and a polymer compound having such a structure is called a linear polymer compound;

  The second type is a bulk structure, and a polymer compound having such a structure is collectively referred to as 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.

  These two different structures exhibit two opposite properties. The linear structure (including the branched structure) polymer has the characteristics of elasticity, plasticity, solubility in a solvent, melting by heating, and low hardness and brittleness due to the existence of independent molecules. Since the bulk structure polymer does not have independent macromolecules, it has no elasticity and plasticity, can not be dissolved and melted, can only swell, and has high 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.

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