The industrial landscape of high-performance elastomers has been significantly shaped by the development of Hydroxyl-Terminated Polybutadiene, identified by the identifier cas 64365 11 3. As a critical precursor in the synthesis of specialized polyurethanes, this material provides the essential backbone for products requiring extreme elasticity and chemical resilience. Understanding its molecular architecture is key to unlocking superior material properties in demanding environments.
Global demand for high-energy bonding agents and resilient sealants has pushed the chemical industry to refine the production of cas 64365 11 3 to meet stringent purity and viscosity standards. From aerospace applications to heavy-duty industrial coatings, the ability to tune the hydroxyl value and molecular weight allows engineers to customize the mechanical performance of the final polymer. This versatility makes it an indispensable asset in the modern chemical toolkit.
By leveraging the unique physicochemical properties of cas 64365 11 3, manufacturers can overcome traditional limitations in material durability and low-temperature flexibility. Whether it is used as a bonding carrier or a primary resin, this chemical provides the structural integrity needed for long-term reliability. In the following analysis, we will explore the technical specifications, application ranges, and future innovations surrounding this vital inorganic salt derivative and polymer precursor.
Technical Specifications of cas 64365 11 3
The material identified as cas 64365 11 3 is characterized by its distinct physicochemical profile, most notably its hydroxyl value which typically ranges from 28 to 56 mg KOH/g. This range corresponds to a molecular weight of approximately 2000 to 4000, providing a balanced foundation for various polymerization processes. Its appearance as a colorless or light yellow transparent liquid ensures high purity and ease of integration into liquid-phase chemical reactions.
Another critical parameter is its glass transition temperature (Tg), which falls between -70 and -55ºC. This exceptionally low Tg is a direct result of its microstructure; specifically, a higher content of 1,2-structure leads to a higher Tg, allowing for precise tuning of low-temperature flexibility. This makes the polymer highly effective in extreme cold-weather applications where other elastomers would become brittle and fail.
Chemical Reactivity and Synthesis Role
The utility of cas 64365 11 3 stems primarily from its active hydroxyl groups. These functional groups serve as the primary sites for chemical bonding, allowing the material to react efficiently with isocyanates (-NCO), acid anhydrides, and epoxides. This reactivity is the cornerstone of polyurethane synthesis, where it acts as a flexible polyol component.
In the synthesis process, the precise control of the hydroxyl value allows chemists to dictate the cross-linking density of the resulting polymer. A higher concentration of hydroxyl groups generally leads to a more tightly bound network, increasing the hardness and thermal stability of the final product, while lower values maintain higher elasticity.
Beyond polyurethanes, the reactivity of this compound is leveraged in the creation of specialized adhesives and bonding carriers. Its ability to form strong covalent bonds with various curing agents ensures that the final composite material possesses high shear strength and superior adhesion to diverse substrates.
Impact of Molecular Weight on Performance
Molecular weight is a decisive factor in the physical behavior of cas 64365 11 3. Specifically, viscosity is directly proportional to the molar mass of the polymer chains. For instance, a lower molecular weight variant may exhibit a viscosity of 500 mPa·s, making it ideal for spray applications or penetration into porous materials.
Conversely, when utilizing cas 64365 11 3 in its higher molecular weight forms, viscosity can climb up to 5000 mPa·s. This increase in viscosity is often preferred in casting processes or when the material is used as a thick bonding carrier, as it prevents sagging and maintains the dimensional stability of the component during the curing phase.
The relationship between the Mean Molar Mass (VPO/GPC) and the resulting mechanical properties is critical. By selecting a specific grade—ranging from HTPB-20 (1300-2500) up to HTPB-42 (3800-4600)—manufacturers can precisely engineer the balance between tensile strength and elongation, ensuring the material meets the exact needs of the application.
Comparative Analysis of HTPB Grades
When evaluating the different grades of cas 64365 11 3, it becomes evident that the hydroxyl value and viscosity are the primary variables. Lower grades like HTPB-20 offer a higher hydroxyl value (1.21-1.60 mmol/g) and lower viscosity, which facilitates faster reaction rates and easier mixing.
In contrast, premium grades such as HTPB-42 provide a lower hydroxyl value (0.47-0.53 mmol/g) but significantly higher molecular mass (3800-4600). This results in a polymer with superior mechanical toughness and a more robust structure, which is essential for high-stress industrial components.
Viscosity and Molecular Weight Performance of cas 64365 11 3
Global Industrial Applications
The versatility of cas 64365 11 3 allows it to be integrated into a wide array of sectors. In the aerospace and defense industries, it is primarily utilized as a high-energy bonding carrier, where its thermal stability and mechanical strength are paramount for the integrity of propulsion systems and specialized seals.
Beyond high-tech sectors, it finds significant use in the production of water treatment chemicals and mineral processing reagents. Its hydrophobic nature and ability to be modified into specialized copolymers make it an excellent base for agents that require specific solubility profiles to separate minerals or treat industrial wastewater in remote mining zones.
Environmental Stability and Solubility
One of the most defining characteristics of cas 64365 11 3 is its solubility profile. It is completely insoluble in water, which ensures that materials synthesized from this polymer remain stable even when exposed to high-humidity environments or direct water contact. This water-resistance is critical for outdoor industrial coatings.
However, it remains highly soluble in common organic solvents such as toluene, acetone, and chloroform. This allows for easy dilution and mixing during the manufacturing process, enabling the creation of consistent blends without the need for high-temperature melting, which reduces energy consumption during production.
The chemical stability of the polybutadiene backbone further protects the material from oxidative degradation. When properly cured, the resulting polymers exhibit high resistance to oils and various chemical reagents, ensuring a long service life in corrosive industrial environments.
Quality Control and Grading Standards
To maintain the reliability of cas 64365 11 3, strict quality control measures are implemented. Key indicators include the monitoring of water content, which must be kept below 0.05% to 0.10% depending on the grade, as moisture can interfere with the reaction of isocyanates, leading to voids or bubbles in the final polymer.
Peroxide levels are also closely monitored, with limits typically ranging from ≤0.040% to ≤0.100%. Excess peroxides can lead to premature cross-linking or instability during storage. Volatile content is kept under 0.75% to ensure that no solvent residues compromise the mechanical properties of the finished product.
By adhering to these precise specifications, suppliers can guarantee a consistent product that behaves predictably during the polymerization process. The following table summarizes the core specifications across the primary grades of this material.
Comparative Specifications of HTPB Grades for cas 64365 11 3
| Grade Name |
Hydroxyl Value (mmol/g) |
Viscosity (40°C, Pa.S) |
Mean Molar Mass (GPC) |
| HTPB-42 |
0.47-0.53 |
≤9.5 |
3800-4600 |
| HTPB-37 |
0.54-0.64 |
≤7.0 |
3300-4100 |
| HTPB-33 |
0.65-0.70 |
≤8.5 |
3000-3600 |
| HTPB-30 |
0.71-0.80 |
≤4.0 |
2700-3300 |
| HTPB-25 |
0.81-1.20 |
≤3.5 |
2000-3000 |
| HTPB-20 |
1.21-1.60 |
≤3.0 |
1300-2500 |
FAQS
It serves as a flexible polyol precursor. Its hydroxyl groups react with isocyanates to create polyurethanes with exceptional elasticity and low-temperature flexibility, making it ideal for high-performance seals and bonding agents.
Viscosity is tied to molecular weight. Lower grades like HTPB-20 have lower viscosity (≤3.0 Pa.S), while higher grades like HTPB-42 have significantly higher viscosity (≤9.5 Pa.S), which affects the material's flow and application method.
No, it is completely insoluble in water. This property is highly beneficial for creating water-resistant materials. However, it is readily soluble in organic solvents like toluene, acetone, and chloroform.
The Tg (ranging from -70 to -55ºC) determines the temperature at which the material transitions from a hard, glassy state to a flexible, rubbery state. A lower Tg allows the polymer to remain flexible in extreme arctic conditions.
Choose HTPB-42 for applications requiring higher mechanical strength, higher molecular mass, and higher viscosity. Choose HTPB-20 if you need a higher hydroxyl value for faster reaction rates or a lower viscosity for easier mixing.
Water content and peroxides are the most critical. High water content can cause unwanted side reactions with isocyanates (producing CO2 gas), while peroxides can lead to unstable storage and premature curing.
Conclusion
The technical versatility of cas 64365 11 3 makes it a cornerstone of modern elastomer science. By balancing the hydroxyl value, molecular weight, and viscosity across various grades, it provides the necessary structural foundation for high-performance polyurethanes and bonding carriers. Its unique combination of low-temperature flexibility, water insolubility, and chemical reactivity ensures its continued relevance in critical industrial applications.
Looking forward, the integration of this material into green chemistry and sustainable manufacturing will likely drive further innovation. As industries demand more durable and energy-efficient materials, the precise tuning of the HTPB microstructure will be essential. We recommend partnering with specialized suppliers to ensure the exact grade is matched to your specific mechanical requirements. Visit our website: www.sdjz-chem.com
