Current Location： Home > News > Chemical Knowledge > Distinguish the characteristics and uses of polybutene and polyisobutene

[Chemical Knowledge]：Distinguish the characteristics and uses of polybutene and polyisobutene

Read： 937 Time：17months ago Source：Transform the World with Simplicity

Polybutylene and polyisobutylene, as common polyolefin materials, are widely used in the chemical and plastic manufacturing industries. Although they are all polymerized from butene monomer, there are some obvious differences in the properties and uses of polybutene and polyisobutylene due to different molecular structures. This article will introduce the difference between polybutene and polyisobutene from the aspects of molecular structure, physical properties and application fields.

1. molecular structure:
1. the molecular structure of polybutene is composed of a string of linear butene monomer, belonging to linear polymer. In the molecular structure of polyisobutylene, methyl groups are embedded between butene monomers to form a branched structure, so it belongs to a branched polymer. This branched structure imparts higher thermal stability and impact resistance to polyisobutylene.

2. physical properties:
1. Polybutene has high crystallinity and melting point, showing good hardness and strength, but also has good electrical insulation and wear resistance. The branched structure of polyisobutylene makes it have low crystallinity and melting point, showing good toughness and flexibility, and has good cold resistance.
2. due to the straight chain characteristics of polybutene molecular chain, it has better fluidity and is easy to process and form. However, due to the existence of branched structure, polyisobutylene has poor fluidity and is relatively difficult to process. Therefore, in the processing of plastic products, polybutene is more suitable for injection molding, blow molding and other processing methods, and polyisobutylene is more suitable for extrusion, film blowing and other processing methods.
3. The melting point and thermal stability of polybutene and polyisobutene are also different. Polybutene has a higher melting point and can withstand higher temperatures, so it is more stable in high temperature environments. The melting point of polyisobutylene is lower and the thermal stability is slightly lower than that of polybutene, but due to the existence of branched structure, polyisobutylene has better low temperature degradation performance.

3. applications:
1. polybutene is widely used in plastic products, wire and cable insulation, pipe materials, container packaging and other fields. Because polybutene has high hardness and strength, as well as good electrical insulation, it is often used to make high-strength plastic products and electrical equipment insulation materials.
2. Polyisobutylene is more suitable for areas that require good toughness and flexibility, such as plastic films, plastic bags, and automotive interior parts. The branched structure of polyisobutylene makes it have better cold resistance and impact resistance, so it is more suitable for low temperature environment and large force.

To sum up, there are obvious differences between polybutene and polyisobutylene in molecular structure, physical properties and application fields. The selection of suitable polyolefin materials should be based on specific needs, and its characteristics and advantages and disadvantages should be fully considered. Only by selecting suitable materials and carrying out fine design according to different application fields, can we give full play to the advantages of polyolefin materials and meet the needs of different fields.

Previous： The Difference and Application of Polysulfone and Polyethersulfone

Next： Polybutene and polyisobutylene: Understanding the different plastic materials

News Categories