PDLLA
Poly-DL-lactide
Polylactide (Poly(lactic acid), PLA) is polymer obtained by the ring-opening polymerization of lactide (cyclic dimer of lactic acid) as monomer. Since lactide has 3 optical isomer as L-lactide, D-lactide, and DL-lactide, the polymers obtained from L-lactide, D-lactide, and DL-lactide are abbreviated to PLLA, PDLA, and PDLLA, respectively. The chemical properties of L-lactide and D-lactide are the same while their steric structures are different, PLLA polymer and PDLA polymer have the same characteristics. On the other hand, PDLLA polymer has sterically different structure with PLLA and PDLA polymers, so that the polymer shows the different characteristics with those polymers.
| Chemical name | Poly(DL-lactic acid) Poly-DL-lactide Poly[oxy(1-methyl-2-oxoethylene)] Poly[3,6-dimehthyl-1,4-dioxane-2,5-dione] |
| Chemical formula | −(C3H4O2)n− −O−CO−CH(CH3)− |
| Formula weight | 72.06266 |
| CAS number | 26680−10−4, 26100−51−6, 26023−30−3 |
| Characteristics | Amorphous polymer, Transparent polymer |
Typical specification of PDLLA
The following shows the specification example of our PDLLA polymer product.
| Testing item | Specification |
| Inherent viscosity | ηinh = 0.85 − 1.15 (dL/g) [0.5 g/dL CHCl3, 25 ℃] |
| Weight averaged molecular weight(MW) | MW = 100,000 − 180,000 |
| Glass transition point（Tg） | Tg = 50 − 60 (℃) |
| Particle size | Not passing 500 µm mesh screen. |
| Appearance | No contamination by foreign objects Normal coloring (white or beige/ivory) (Sensory test with eye) |
※If you have the specific requirement for PDLLA polymer, please feel free to ask us.
Potential application of PDLLA
PDLLA polymer is amorphous because the polymer composed randomly by the repeating units from L-lactic acid and D-lactic acid. Therefore, the polymer did not show melting point and has inferior mechanical properties than PLLA, so that the polymer is mainly applied for the coating of suture. Recently, the applications for the novel absorbable medical device has been researched and developed.
Applicable examples of the medical device obtained from PDLLA polymers are shown with color in follows:
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