Description

Polybutadiene-Block-Polyisoprene is a thermoplastic elastomer (TPE) synthesized via anionic polymerization, combining the distinct properties of polybutadiene and polyisoprene blocks. This block copolymer is valued for its excellent elasticity, low-temperature flexibility, and dynamic mechanical performance, making it a versatile material for demanding applications. It is primarily sought by manufacturers in the polymer modification, specialty adhesive, and advanced rubber compounding industries.

Application

• Polymer Modification Agent: Used as a compatibilizer or impact modifier to enhance the toughness and flexibility of polystyrene (PS), acrylonitrile butadiene styrene (ABS), and other engineering plastics.
• High-Performance Adhesives & Sealants: A key component in formulations requiring superior tack, cohesive strength, and resilience, such as pressure-sensitive adhesives (PSAs) and construction sealants.
• Specialty Rubber Compounding: Incorporated into tire tread compounds, vibration dampers, and industrial rubber goods to improve abrasion resistance, grip, and low-temperature performance.
• Footwear & Sporting Goods: Utilized in the production of shoe soles, grips, and flexible components due to its durable elasticity and comfort.
• Bitumen Modification: Enhances the elasticity, durability, and temperature stability of asphalt for high-performance road paving and roofing membranes.
• Medical Device Components: Suitable for non-implantable, flexible parts where biocompatibility and consistent performance are required.

Basic Information

Product Name	Polybutadiene-Block-Polyisoprene
CAS No.	25102-52-7
Molecular Formula	(C4H6)x.(C5H8)y
Molecular Weight	Varies by grade (Typical range: 50,000 - 300,000 g/mol)
Synonyms	Poly(butadiene-block-isoprene); Butadiene-Isoprene Block Copolymer; Styrene-Free Thermoplastic Elastomer (TPE); B-I Block Copolymer; Polybutadiene-Polyisoprene Diblock Copolymer; 1,3-Butadiene, polymer with 2-methyl-1,3-butadiene; Isoprene-Butadiene Block Copolymer
EINECS	Contact for details

Quality Control

Our Polybutadiene-Block-Polyisoprene is manufactured under controlled conditions to ensure batch-to-batch consistency and performance reliability. Quality is verified through a suite of analytical tests including Gel Permeation Chromatography (GPC) for molecular weight distribution, Nuclear Magnetic Resonance (NMR) for block composition, and physical property testing. Certificates of Analysis (COA) detailing specific lot results are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Keep away from heat sources, open flames, and strong oxidizing agents. For long-term storage, consider an inert atmosphere to prevent oxidative degradation.

Specification

Item	Specification
Appearance	Colorless to pale yellow solid / pellets
Identification (IR)	Conforms to structure
Block Ratio (Butadiene/Isoprene)	As per grade (e.g., 50/50, 70/30)
Molecular Weight (Mw)	50,000 - 300,000 g/mol
Polydispersity Index (PDI)	< 1.5
Volatile Matter	< 0.5 %
Ash Content	< 0.1 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.