What are the properties of polyisobutylene?
Chemical Structure and Properties
The chemical formula of polyisobutylene is CH3 – CH2 – C(CH3)2. It is also known as PIB. The nature of polyisobutylene is non- polar due to which it has good thermal and chemical stability. The range of its molecular weight starts from 300 up to several millions. Thus, it possesses various properties like hardness, tensile strength and elongation.
Physical Properties of Polyisobutylene
| Property | Typical Value / Range |
|---|---|
| Appearance | Colorless to light yellow |
| Physical form | Liquid / flakes / solid blocks / powder |
| Density | ~0.91 – 0.92 g/cm³ |
| Molecular weight | ~50,000 to >1,000,000 (grade dependent) |
| Viscosity (100°C) | Varies widely by grade (low to ultra-high viscosity) |
| Glass transition temperature (Tg) | Around -60°C to -70°C |
| Softening behavior | Becomes tacky above ~100°C |
| Permeability (gas & water) | Extremely low |
| Solubility | Insoluble in water |
| Chemical resistance | High resistance to acids, alkalis, ozone |
| Odor | Very faint / nearly odorless |
| Volatility | Very low |
Manufacturing Process
The process of manufacturing is called cationic polymerization. It requires a cooled environment ad presence of a strong acid catalyst to obtain polyisobutylene. The cooled environment helps isobutylene and isoprene in slowing down the reaction rate and controlling the polymerization process. After it is cooled down, the mixture is exposed to the catalyst due to which the units of isobutylene starts forming long chains that marks the beginning of polymerization process.
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What Are the Uses of Polyisobutylene (PIB) in Industry?
Polyisobutylene (PIB) is a high-performance industrial polymer widely used across multiple sectors due to its strong tackiness, chemical stability, and low permeability, making it a key material in modern manufacturing applications.
In adhesives and sealants, Polyisobutylene is widely applied in pressure-sensitive adhesives (PSAs) and hot-melt adhesives (HMAs), where its strong tackiness and bonding performance ensure long-term adhesion stability and durable sealing effects in demanding industrial environments.
In the lubricant and grease industry, Polyisobutylene serves as an effective viscosity modifier that improves thermal stability and maintains consistent performance across wide temperature ranges, making it suitable for formulations such as engine oils, gear lubricants, and hydraulic fluids.
For Polyisobutylene for plasticizer applications, it is used in thermoplastic resins like PE, PP, and PVC to enhance flexibility and processing performance, helping manufacturers achieve improved elasticity and durability in finished plastic products.
In the field of electrical insulating material, Polyisobutylene is valued for its excellent dielectric properties and chemical inertness, making it ideal for cable insulation, capacitors, and other electrical components that require stable and long-term insulation reliability.
In stretch wrap and other film applications, Polyisobutylene functions as a tackifier that enhances cling performance and film integrity, ensuring secure packaging while maintaining clarity, strength, and efficient protective performance in industrial wrapping systems.
Why Choose Our Polyisobutylene (PIB)?
As a professional Polyisobutylene (PIB) manufacturer and exporter with over 10 years of experience, TIANJIN GNEE BIOTECH CO., LTD. provides stable quality, competitive prices, and reliable supply for global buyers.
- Stable Quality: Strict quality control ensures consistent molecular weight and viscosity. COA and MSDS are available for every batch.
- Strong Supply Capacity: Annual production capacity exceeds 25,000 tons, with over 3,000 tons in regular stock.
- Competitive Factory Pricing: Direct factory supply helps reduce procurement costs compared with imported brands.
- Wide Industrial Applications: Suitable for lubricants, adhesives, sealants, rubber modification, and more.
We also provide free samples for testing and support long-term stable cooperation with global customers.