Enzymatic degradation of poly(l-lactide) treated with supercritical carbon dioxide

Tsutsumi, Chikara; Ikeda, Ryousuke; Watanabe, Ryouji; Nakayama, Susumu; Shiomi, Masaki; Nakayama, Yuushou; Shiono, Takeshi

doi:10.1016/j.polymdegradstab.2016.11.010

Cited by 3 publications

(1 citation statement)

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“…Incorporation of essential bark oil into the poly(L-LA- ran -VL) using supercritical carbon dioxide was conducted according to a previously reported method 24,33,34 . Poly(L-LA- ran -VL) was used in the form of 100 μm thick films prepared by the solvent-casting method.…”

Section: Methodsmentioning

confidence: 99%

Impregnation of poly(L-lactide-ran-δ-valerolactone) with essential bark oil using supercritical carbon dioxide

Tsutsumi

Manabe

Nakayama

et al. 2019

Sci Rep

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This work studied the incorporation of essential bark oil from Thujopsis dolabrata var. hondae, which is known to repel various insects, in poly(L-lactide-ran-δ-valerolactone) [poly(L-LA-ran-VL)] using supercritical carbon dioxide (scCO2). The poly(L-LA-ran-VL) was synthesized by first purifying the monomers by azeotropic distillation with benzene, followed by polymerization with Sn(oct)2 using the same equipment, representing an efficient one-pot process. The copolymerization of L-LA with VL using this technique at a feed ratio of 90/10 mol/mol gave poly(L-LA-ran-VL) (91/9) with a molecular weight of 6.48 × 104 g/mol and a high yield of 74.9%. Products with molecular weights over 5.0 × 104 g/mol were obtained at L-LA feed proportions of 70 to 90%. Impregnation trials were conducted between 40 and 120 °C at 14 MPa for 3 h. The oil content of a 73/27 specimen was found to increase significantly during processing at 100 or 120 °C. During enzymatic degradation with proteinase K, the 91/9 specimen showed the fastest degradation rate. Although the 71/29 sample was slowly hydrolyzed in a phosphate buffer at pH 7.0, the release of oil vapor from this material was slightly higher than that from the 91/9 specimen, and the vapor release rate continuously increased throughout the hydrolysis process.

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Section: Methodsmentioning

confidence: 99%