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What are the polymer compounds?
The molecules of high molecular compounds (also called polymers) are much larger than those of low molecular organic compounds. Generally, the relative molecular weight of organic compounds does not exceed 1000, while the relative molecular weight of polymer compounds can be as high as104 ~1060,000. Due to high molecular weight, high molecular compounds are quite different from low molecular compounds in physical, chemical and mechanical properties.
Characteristics of polymer:
1. From the point of view of relative molecular weight and composition, the relative molecular weight of polymer is very large and it has "polydispersity". Most polymers are polymerized from one or more monomers.
2. From the perspective of molecular structure, there are basically only two kinds of molecular structures of polymers, one is linear structure and the other is bulk structure. The characteristic of linear structure is that atoms in molecules are connected with each other through covalent bonds, forming a long curly "chain" (called molecular chain).
The body structure is characterized by many covalent bonds between molecular chains, forming a three-dimensional network structure. These two different structures are quite different in performance.
3. From the performance point of view, due to the relatively large molecular weight, polymers are usually in solid or gel state and have good mechanical strength; Because its molecules are formed by covalent bonds, it has good insulation and corrosion resistance; Because of its long molecular chain, the aspect ratio of molecules is greater than 1000, so it has good plasticity and high elasticity.
High elasticity is a unique property of polymers. In addition, solubility, fusibility, solution behavior and crystallinity are also very different from those of low molecular weight.
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