Overview
Polycaprolactone Glycol (PCLG) is a high-performance polyester polyol derived from ε-caprolactone monomer. As a key intermediate in polyurethane chemistry, it offers unique biodegradability and mechanical properties. The material is particularly valued in industries requiring environmentally friendly solutions without sacrificing performance. PCLG's molecular weight can be precisely controlled during synthesis, allowing manufacturers to tailor properties for specific applications. This versatility makes it a preferred choice over conventional polyether polyols in many specialty applications, particularly where hydrolysis resistance and biodegradability are required.
Physical and Chemical Properties
PCLG exhibits excellent low-temperature flexibility and UV stability compared to other polyols. Its ester linkages provide biodegradability while maintaining good mechanical strength. The material typically has hydroxyl values ranging from 20-112 mg KOH/g, depending on molecular weight. The polymer's crystallinity decreases with lower molecular weights, resulting in products that range from waxy solids to viscous liquids at room temperature. PCLG shows exceptional compatibility with aromatic and aliphatic isocyanates, enabling formulation flexibility in polyurethane systems. Its hydrolytic stability is superior to adipate-based polyester polyols but inferior to polyether polyols.
Main Applications
In polyurethane systems, PCLG produces elastomers with outstanding abrasion resistance and dynamic properties, making it ideal for shoe soles, industrial wheels, and automotive parts. The biomedical field utilizes PCLG for drug delivery systems and biodegradable implants due to its controlled degradation profile. The coatings industry values PCLG for producing flexible, weather-resistant finishes for textiles and plastics. In adhesives, it enhances initial tack and ultimate bond strength. Emerging applications include 3D printing filaments and shape-memory polymers where its thermal properties are advantageous.
Safety and Storage
PCLG is generally recognized as safe for handling with proper precautions. As with all chemicals, appropriate PPE including gloves and eye protection should be used. The material is not classified as hazardous under GHS, but thermal decomposition products may be harmful. Proper storage is crucial to maintaining product quality. Containers should be nitrogen-purged to prevent moisture absorption and oxidation. Shelf life typically exceeds 12 months when stored below 30°C in original, unopened containers. Opened containers should be resealed immediately and used within 3 months.
B2B Procurement Guide
When sourcing PCLG, buyers should specify molecular weight (typically 500-3000 for most applications), hydroxyl value, and acid value requirements. Technical datasheets should include viscosity at 25°C and water content (<0.05% preferred). For large-volume purchases (container loads), consider requesting custom molecular weight grades. Lead times for specialty grades may extend to 8-12 weeks. Quality certifications to request include ISO 9001 and REACH compliance documentation. For biomedical applications, USP Class VI or FDA compliance may be required.
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