D lactide d la

The lactide monomers L-lactide (L-LA) and D-lactide (D-LA) were purchased from Corbion (Amsterdam, Netherlands). Tin(II)bis(2-ethylhexanoate) and stannous octoate (Sn(Oct)₂) (Sigma Chemical Co., St. Louis, MO, USA, purity ≥ 99%) and 1-dodecanol (DoOH) (Sigma-Aldrich, purity ≥ 99.5%) were purified by distillation under reduced pressure and dissolved in dry toluene. The toluene (Sigma-Aldrich, purity ≥ 99.5%) was dried by refluxing it over a benzophenone-Na complex and distilling it in a nitrogen atmosphere immediately prior to use. Chloroform and methanol (Merck Milipore, Burlington, MA, USA, purity > 99.5%) were used as received. The s-PLA materials were synthesized from PDLA (M_n ≈ 87,000 g/mol; PDI = 1.437) and PLLA (M_n ≈ 87,000 g/mol; PDI = 1.759) blends with a 1:1 weight ratio using supercritical carbon dioxide–dichloromethane at 65 °C and 350 bar for 5 h [8 (link)]. The synthesized s-PLA materials were obtained in dry and powder-shaped form and then sieved by vibratory sieve shakers with different particle size ranges. Dry and powder-shaped s-PLA materials were classified based on particle size: <53 µm (A), 53–125 µm (B), and 125–212 µm (C).

L-lactide (L-LA) and D-Lactide (D-LA) were purchased from Corbion (Amsterdam, The Netherlands). Tin(II)bis(2-ethylhexanoate) (Sn(Oct)₂) (Sigma Chemical Co., St. Louis, MO, USA, purity ≥ 99%) and 1-dodecanol (DoOH) (Sigma-Aldrich, St. Louis, MO, USA, purity ≥ 99.5%) were purified by distillation under reduced pressure and dissolved in dry toluene. The toluene was dried by refluxing over a benzophenone-Na complex and distilled in a nitrogen atmosphere just prior to use. High molecular weight PLLA (M_n = 181,493 g/mol, M_w = 425,561 g/mol, PDI = 2.345) was synthesized by ring-opening polymerization of L-lactide (Corbion, Amsterdam, The Netherlands) at 130 °C for 24 h. Other PLA homopolymers for nucleating agent materials: PDLA (M_n = ~87,000 g/mol, M_w = ~125,000 g/mol, PDI = 1.437) and PLLA (M_n = ~87,000 g/mol, M_w = 153,000 g/mol, PDI = 1.759) were also synthesized by a similar method. Dichloromethane (JT Baker, HPLC grade) and CO₂ (Purity ≥ 99.9%) were used as received.