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Styrene and ethylene are two common organic compounds with many differences in properties and applications. The chemical formula C8H8 of styrene is an aromatic hydrocarbon composed of a benzene ring and an vinyl group C2H3. The chemical formula C2H4 for ethylene is a colorless gas composed of two carbon atoms and four hydrogen atoms. Here are some main differences between styrene and ethylene

1. Molecular structure: 

Styrene is composed of a benzene ring and a vinyl group, while ethylene only has two carbon atoms and four hydrogen atoms, without an aromatic ring structure. The difference in molecular structure leads to differences in their properties and applications

2. Physical properties: 

Styrene is a colorless liquid with a special aromatic odor and high density. Ethylene is a colorless gas with no obvious odor and a lower density. The boiling and melting points of the two are also different. Styrene has a higher boiling and melting point, while ethylene has a lower one

3. Chemical properties: 

Styrene is relatively stable and not prone to chemical reactions, but other organic compounds can be obtained through hydrogenation, halogenation reactions, etc. Ethylene, on the other hand, is more reactive and easily undergoes reactions such as addition and polymerization. It can be used to prepare a range of plastics, synthetic fibers, etc

4. Application field: 

Styrene is mainly used to manufacture polystyrene PS plastics, synthetic rubber, synthetic fibers, etc. Polystyrene is widely used in fields such as electronic products, building materials, packaging materials, etc. Ethylene is an important raw material for manufacturing plastics such as polyethylene (PE) and polyvinyl chloride (PVC), and is widely used in plastic products, pipelines, packaging films, and other fields

In summary, there are significant differences between styrene and ethylene in terms of molecular structure, physical properties, chemical properties, and application fields. Having a deep understanding of the characteristics and applications of these two chemicals can help us better utilize them to meet the needs of different fields.