Overview
Poly(L-lactic acid) (PLLA) is a semi-crystalline, biodegradable polyester derived from renewable resources like corn starch or sugarcane. As one of the most widely used biopolymers, PLLA offers an eco-friendly alternative to petroleum-based plastics while maintaining comparable mechanical properties. First developed in the 1930s, PLLA gained industrial significance in the 1990s with advancements in polymerization techniques. Its L-isomer configuration provides superior mechanical strength and slower degradation rates compared to racemic PLA blends, making it particularly valuable for long-term medical applications.
Physical and Chemical Properties
PLLA exhibits a glass transition temperature (Tg) of 55-65°C and melting point of 170-180°C, with crystallinity typically ranging from 30-50%. The polymer demonstrates tensile strength of 50-70 MPa and elongation at break of 2-10%, varying with molecular weight (commonly 50,000-300,000 g/mol). Chemically, PLLA hydrolyzes in moist environments, breaking down into lactic acid monomers. Degradation rates depend on crystallinity, molecular weight, and environmental conditions (temperature, pH, microorganisms). The polymer shows excellent UV resistance but begins thermal decomposition above 200°C.
Main Applications
In the medical field, PLLA dominates absorbable sutures, orthopedic fixation devices (screws, pins), and tissue engineering scaffolds due to its 12-24 month degradation profile and FDA approval. The packaging industry utilizes PLLA for food containers, films, and disposable tableware where compostability is prioritized. Industrial applications include 3D printing filaments (often blended with polycaprolactone for flexibility) and non-woven fabrics for agricultural mulch. Recent developments incorporate PLLA in durable goods like automotive interior components through impact modification technologies.
Safety and Storage
PLLA is generally recognized as safe (GRAS) for food contact and medical implantation. Material Safety Data Sheets classify it as non-hazardous, though processing at high temperatures may release lactide vapors requiring ventilation. Proper storage involves double-bagging in moisture-proof packaging with desiccants, maintaining relative humidity below 50%. Prolonged exposure to humidity (>60% RH) can initiate premature hydrolysis. Bulk quantities should be stored on pallets away from direct sunlight, with a recommended shelf life of 24 months under optimal conditions.
B2B Procurement Guide
Industrial buyers should specify: 1) Molecular weight (inherent viscosity 1.0-4.0 dL/g), 2) Residual monomer content (<0.3% for medical grade), 3) Sterilization compatibility (gamma/E-beam/EtO), and 4) Additive package (nucleating agents, plasticizers if any). For large-volume procurement (5+ MT), consider direct contracts with manufacturers like Corbion, NatureWorks, or Evonik. Mid-volume buyers (100kg-1MT) may benefit from regional distributors offering technical support. Always request certificates of analysis for melt flow index, optical purity (>98% L-isomer), and heavy metal content when sourcing for regulated applications.
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