Polylactic acid properties
Crystallinity of polylactic acid resin depends on the relative proportions of the L- and D-Lactide in the polymer backbone. Higher the optically pure monomer content, higher the crystallinity. The melting point of PLA could range from 140 – 185 C, and a blend of Pure PLLA and PDLA could reach as high as 230 C.
As you can see from the following Figure, PDLA can be synthesized starting from D_lactide, using special catalysts.
Mechanical properties of polylactic acid depends on the molecular weight, molecular architecture as well as the degree of crystallinity.
PLA resembles most of the properties on conventional thermoplastics including PET, and polystyrene (PS), opening possibilities to replace petroleum based thermoplastics in many applications.