epsilon-CAPROLACTONE → L-lactide epsilon-caprolactone

Participants

Reaction Steps

72 g of L-lactide and 171 g of ε-caprolactone, and 100 ppm of the total weight of catalyst were placed in a glass ampoule, subjected to pressure reduction and sealed. Then, they were kept at 140° C. for 48 hours, obtaining a L-lactide/ε-caprolactone copolymer [molar ratio: 25/75; weight average molecular weight by GPC: 200,000; hereinafter referred to as P (L-LA/CL) (molar ratio: 25/75)]. Thus obtained P (L-LA/CL) (molar ratio: 25/75) was dissolved in a solvent (chloroform) so that the concentration of the solution became 5 wt %. After complete dissolution, the solution was subjected to filtration to remove insoluble matter. The solution was then cast on a glass plate (flow casting) and subjected to air drying, followed by vacuum drying at room temperature for 12 hours to remove the solvent, obtaining a composition made of P (L-LA/CL) (molar ratio: 25/75). The thickness of the obtained composition was 94 μm.

Provenance & Evidence