Overview
Poly(L-lactic acid) (PLLA) is a semi-crystalline, aliphatic polyester synthesized via ring-opening polymerization of L-lactide. Derived from renewable biomass, it aligns with circular economy principles due to its compostability and low carbon footprint. As a stereoisomer of polylactic acid (PLA), PLLA offers superior mechanical strength and slower degradation rates compared to its D,L counterpart. Its versatility has driven adoption in industries prioritizing sustainability, such as green packaging and biomedical engineering.
Physical and Chemical Properties
PLLA exhibits a glass transition temperature (Tg) of 50–60°C and crystallinity up to 40%, influenced by processing conditions. Its tensile strength (50–70 MPa) and Young’s modulus (2.7–4.1 GPa) make it suitable for load-bearing applications. The polymer hydrolyzes slowly in vivo or under composting conditions (6–24 months), breaking down into non-toxic lactic acid. UV resistance is moderate, requiring additives for outdoor use. Thermal degradation begins around 200°C, releasing cyclic oligomers.
Main Applications
In medicine, PLLA is used for absorbable sutures, orthopedic fixation devices, and drug-delivery systems due to its biocompatibility and predictable degradation. FDA-approved grades meet stringent sterility requirements. Industrial uses include compostable food packaging, disposable cutlery, and agricultural films. High-purity PLLA filaments are favored in fused deposition modeling (FDM) 3D printing for prototyping and custom medical devices.
Safety and Storage
PLLA is classified as non-hazardous under GHS. Dust inhalation during machining may irritate respiratory tracts; PPE like N95 masks is recommended. Process below 200°C to prevent toxic fumes. Store in moisture-proof bags with desiccants to prevent hydrolysis. Bulk quantities should be palletized in climate-controlled warehouses. Shelf life typically exceeds 2 years if stored properly.
B2B Procurement Guide
Key specifications to evaluate include inherent viscosity (IV: 1.0–4.0 dL/g), residual monomer content (<1%), and endotoxin levels (<20 EU/g for medical grade). Request certificates for ISO 13485 or ASTM D6400 compliance. Suppliers often provide pelletized or pre-dried forms to minimize moisture. For large orders (>1 ton), negotiate pricing tiers and confirm lead times, as production is batch-dependent. Consider regional logistics to reduce carbon emissions.
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