General Description : PLLA is a melt-processable semi-crystalline thermoplastic made by biological fermentation from renewable carbohydrate feedstocks. PLLA is quite stable under everyday conditions, although it does degrade slowly in humid environments at temperatures above its glass transition temperature 55°C. Therefore, composting is usually carried out in professional facilities over a number of week, rather than in garden compost.
Its chemical resistance is somewhat limited although it is said to have good resistance to solvents in general. PLLA is a stiff polymer of high crystallinity (60-70%), whose mechanical properties are similar to those of polystyrene. It can be processed as a classic thermoplastic material and has similar processing characteristics to liquid crystal polymers LCPs.
Applications for PLLA is mostly used in food packaging, envelope windows, floral wrap. It is also being considered for a range of medical applications, such as bioresorbable stitches and anchors, although at the time of writing these applications are very much in the research phase.