Overview
PCL-B-P (Polycaprolactone-block-polymer) is a biodegradable aliphatic polyester widely used in biomedical and eco-friendly packaging industries. It belongs to the polycaprolactone family, characterized by its slow degradation rate and excellent compatibility with other polymers. The material is synthesized via ring-opening polymerization of ε-caprolactone, often modified with additional blocks to tailor its properties. Its biodegradability occurs through hydrolysis of ester linkages, making it suitable for temporary medical applications where gradual absorption is required.
Physical and Chemical Properties
PCL-B-P exhibits semi-crystalline morphology with a glass transition temperature around -60°C, contributing to its flexibility at room temperature. Its crystallinity typically ranges between 45-55%, influencing mechanical strength and degradation kinetics. The polymer demonstrates good resistance to oils and solvents while remaining processable by extrusion or injection molding. Its molecular weight directly affects melt viscosity and tensile strength, with commercial grades available from 10,000 to 80,000 g/mol.
Main Applications
In the medical field, PCL-B-P serves as a matrix for long-term drug delivery systems and absorbable surgical sutures. Its controlled degradation profile (6-24 months) makes it ideal for orthopedic fixation devices and tissue engineering scaffolds. The packaging industry utilizes PCL-B-P blends for compostable films and agricultural mulch. When combined with starch or PLA, it enhances the biodegradability of disposable items while maintaining adequate barrier properties against moisture.
Safety and Storage
PCL-B-P is generally recognized as safe for medical use, complying with ISO 10993 and USP Class VI standards. However, thermal degradation above 200°C may release caprolactone monomers requiring proper ventilation. Storage recommendations include moisture-proof packaging with desiccants to prevent hydrolysis. Bulk quantities should be palletized in climate-controlled warehouses, maintaining relative humidity below 50% to preserve material integrity before processing.
B2B Procurement Guide
Industrial buyers should specify molecular weight range and block composition when sourcing PCL-B-P, as these parameters determine processing methods and end-use performance. Medical-grade material requires additional documentation including biocompatibility certificates and sterilization compatibility data. For packaging applications, verify compostability certifications (e.g., EN 13432) and request technical data sheets with mechanical property profiles. Large-volume purchasers may negotiate prices down to $40/kg for annual contracts exceeding 5 metric tons.
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