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[Chemical Knowledge]：Polybutene and polyisobutylene: Understanding the different plastic materials

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Polybutene and polyisobutylene are two common polymer plastic materials, and there are some differences in their chemical structures, which have a significant impact on their physical and chemical properties.

polybutene, also known as polypropylene, belongs to olefin plastics, and the repeating unit in its chemical structure is propylene (C3H6), so it is also called polypropylene. Polybutene has excellent physical properties such as high wear resistance, high strength, high melting point and heat distortion temperature. Because of these characteristics, polybutene is often used in the manufacture of various containers, food packaging, medical equipment and automobile parts. In addition, polybutene also has good corrosion resistance, electrical insulation and low water absorption, making it widely used in various fields.

and polyisobutylene is a plastic material polymerized from repeating units of isoprene (C5H8). Polyisobutylene has higher tear resistance, low temperature resistance, rubber elasticity and processability than polybutene. Because of these characteristics, polyisobutylene is mostly used in the manufacture of various rubber products, such as seals, pipes, anti-vibration pads, etc. In addition, polyisobutylene also has good chemical resistance and solvent resistance, making it widely used in the chemical industry and pharmaceutical packaging industry.

From the point of view of physical properties, polybutene and polyisobutylene have differences in melting point and heat distortion temperature. The melting point and thermal deformation temperature of polybutene are higher, up to 130-171 degrees Celsius, while the melting point and thermal deformation temperature of polyisobutylene are lower, generally between 60-70 degrees Celsius. This allows polybutene to exhibit better stability and durability in high temperature environments, while polyisobutene is suitable for use in low temperature environments.

From the application point of view, polybutene and polyisobutylene have a wide range of applications in different fields. Polybutene is often used to manufacture various daily necessities and industrial products, and is widely used in food packaging, medical equipment, building materials and auto parts. Polyisobutylene is mainly used to manufacture rubber products, such as industrial seals, auto parts, oil pipelines, etc.

In summary, polybutene and polyisobutylene are two different plastic materials that have their own unique physical and chemical properties and are suitable for different applications. Understanding their differences and characteristics helps us to choose suitable materials and use their advantages to meet the needs of different fields.

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