Polylactic acid properties

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.

Synthesis-of-D-Lactide

Synthesis-of-D-Lactide

Mechanical properties of polylactic acid depends on the molecular weight, molecular architecture as well as the degree of crystallinity.

Synthesis-of-L-Lactide

Synthesis-of-L-Lactide

PLA resembles most of the properties on conventional thermoplastics including PET, and polystyrene (PS), opening possibilities to replace petroleum based thermoplastics in many applications.

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