The properties of the polymer are related not only to the relative molecular mass and molecular structure of the polymer, but also to the interrelationship between the molecules, ie, the state of aggregation. Polymers of the same linear structure, some have high elasticity (such as natural rubber), and some show very hard (such as polystyrene), because of their different aggregation states. Even if the same polymer has different aggregation states, the performance will vary greatly. For example, chemical fibers must be stretched during the manufacturing process to change the aggregation state of the molecules inside the polymer and to align their molecular chains. It is neatly tidy, which increases the attraction between molecules and makes the product stronger. Therefore, studying the aggregation state of high polymers is another important aspect to understand the relationship between polymer structure and properties.

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