Overview
L-Lactic Acid PLLA (Poly L-Lactic Acid) is a biodegradable and biocompatible polymer synthesized from L-lactic acid monomers derived from renewable resources like corn starch or sugarcane. It is a key material in sustainable industries due to its ability to degrade into non-toxic byproducts under compostable conditions. PLLA is favored in medical and packaging sectors for its mechanical strength and versatility. Its production aligns with circular economy principles, reducing reliance on fossil-fuel-based plastics.
Physical and Chemical Properties
PLLA exhibits a semi-crystalline structure with a glass transition temperature (Tg) of 60-65°C and a melting point of 175-185°C. Its mechanical properties, such as tensile strength (50-70 MPa) and elongation at break (5-10%), make it suitable for load-bearing applications like surgical sutures. The polymer is hydrophobic but hydrolyzes slowly in aqueous environments, degrading into lactic acid. Its solubility in organic solvents like chloroform facilitates processing into films, fibers, or 3D-printed structures.
Main Applications
In the medical field, PLLA is used for absorbable sutures, bone screws, and drug delivery systems due to its biocompatibility and controlled degradation. It is also FDA-approved for dermal fillers. For packaging, PLLA serves as a compostable alternative to conventional plastics in food containers and films. In textiles, it is spun into fibers for eco-friendly apparel. Emerging uses include 3D printing filaments and agricultural mulch films.
Safety and Storage
PLLA is generally safe but requires handling precautions to avoid dust inhalation or eye irritation. Use gloves and goggles during processing. Store in sealed containers at room temperature, avoiding humidity to prevent premature hydrolysis. Disposal should follow composting guidelines for industrial facilities, as home composting may not provide adequate degradation conditions. Incineration is not recommended due to potential particulate emissions.
B2B Procurement Guide
When sourcing PLLA, prioritize suppliers with ISO 13485 certification for medical-grade material. Key specifications include molecular weight (typically 80,000-150,000 Da), optical purity (>99% L-isomer), and residual monomer content (<1%). Bulk pricing is often negotiable for orders exceeding 1 ton. Request samples to test processability (e.g., melt flow index) and verify biodegradability certificates (e.g., EN 13432 or ASTM D6400). Lead times vary from 4-8 weeks for custom polymerizations.
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