DL-Lactide

Name: L-3,6-Dimethyl-1,4-dioxane-2,5-dione

CAS No: 95-96-5

Appearance: white particle

Purity: >99.5%

Minimal order quantity: 200 gram

D,L-lactide, also known as DL-lactide, is a mixture of two different stereoisomers of lactide: D-lactide and L-lactide. These isomers are mirror images of each other and are therefore referred to as enantiomers. Lactide itself is a cyclic diester that is formed from the condensation of two molecules of lactic acid.

The “D” and “L” prefixes refer to the configuration of the lactic acid molecules that make up the lactide. In the case of D,L-lactide, it contains an equal mixture of both the D- and L- forms. This racemic mixture can be used to produce polylactic acid (PLA) polymers that have a balance of properties derived from both enantiomers.

PDLLA polymer made from D,L-lactide are used in a variety of applications, including biodegradable plastics, biomedical devices, and as a material for 3D printing. The properties of the resulting PLA can vary depending on the ratio of the D to L enantiomers, with the racemic D,L-lactide often leading to polymers that are amorphous rather than crystalline, giving them different mechanical and degradation properties.

FAQs

dl-lactide is a mixture of two stereoisomers of lactide, namely ( R, R )-lactide and ( S, S )-lactide. Lactide is a cyclic ester derived from lactic acid, which is a biodegradable and biocompatible polymer.

The solvent for lactide is typically a polar organic solvent, such as methyl ethyl ketone (MEK), tetrahydrofuran (THF), or chloroform. These solvents are commonly used in the polymerization process of lactide to dissolve and react with the monomer.

DL-lactide is a versatile compound that finds various applications in different industries. Some common uses of DL-lactide include its incorporation into the production of biodegradable polymers, such as polylactic acid (PLA).

DL-lactide can also be utilized as a monomer in the synthesis of specialty chemicals and pharmaceuticals. Additionally, DL-lactide has potential uses as a chiral building block in organic synthesis, allowing for the production of various compounds with specific optical properties.

dl-lactide is a moisture-sensitive and heat-sensitive chemical that can degrade or polymerize over time. To store it safely, you should follow these steps: 

  • Keep the dl-lactide in a sealed container with a desiccant to prevent moisture absorption1. 
  • Store the container in a cool, dry, and dark place, away from heat, light, and oxygen sources.
  • Avoid opening the container frequently or exposing the dl-lactide to air for long periods1. 
  • Use the dl-lactide as soon as possible after opening the container, or transfer the unused portion to a smaller container with less air space1. 
  • Check the appearance and the melting point of the dl-lactide before use. If it is discolored, cloudy, or has a higher or lower melting point than expected, it may have degraded or polymerized and should be discarded.
 

DL-lactide is a monomer that can be used to synthesize polylactic acid (PLA), which is a biodegradable plastic1. According to one source, PLA can be chemically recycled to monomer by thermal depolymerization or hydrolysis.

However, this process may require high temperature, pressure, and catalysts, and may not be feasible or cost-effective for large-scale recycling. 

Alternatively, PLA can be composted in industrial facilities or degraded by enzymes or microorganisms under specific conditions. However, these methods may not be widely available or accessible for consumers, and may not completely degrade the PLA products. 

Therefore, recycling dl-lactide or PLA is not very easy or common, and may depend on the availability and suitability of different technologies and facilities. A better option may be to reduce the consumption and disposal of dl-lactide or PLA products, and to reuse them as much as possible.

The shelf life of dl-lactide is not very long, as it is a moisture-sensitive and heat-sensitive chemical that can degrade or polymerize over time.

dl-lactide is synthesized by the depolymerization of polylactic acid (PLA) in the presence of a catalyst, such as tin (II) octoate or zinc acetate. The depolymerization can be carried out by heating PLA in a vacuum or under an inert atmosphere, or by using a solvent, such as toluene or ethyl acetate. The resulting dl-lactide can be purified by distillation or crystallization.

dl-lactide and l-lactide are two stereoisomers of lactide, which is a cyclic ester derived from lactic acid. Stereoisomers are molecules that have the same chemical formula and structure, but differ in the spatial arrangement of their atoms. dl-lactide is a racemic mixture of ( R, R )-lactide and ( S, S )-lactide, which are mirror images of each other. l-lactide is a pure form of ( S, S )-lactide, which has the same configuration as natural lactic acid.

The difference between dl-lactide and l-lactide results in different physical and chemical properties. For example, dl-lactide has a lower melting point (95-97 °C) than l-lactide (97-99 °C), and a higher solubility in water (0.5 g/L) than l-lactide (0.1 g/L). dl-lactide also has a slower polymerization rate and a lower molecular weight than l-lactide, which may affect the performance and the durability of the resulting polylactic acid (PLA).

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