特集：二酸化炭素が関わる材料の基礎と応用
高圧CO2を利用した光透過性ナノ発泡体の開発
キーワード:
nanocellular foams,
microcellular foams,
poly(methyl methacrylate),
CO2,
rapid depressurization,
two-step foaming
2022 年 32 巻 4 号 p. 184-191
詳細
2022 年 32 巻 4 号 p. 184-191
A new foaming apparatus, which can depressurize the vessel containing polymer sample and CO2 from 100 MPa to atmospheric pressure in the order of milliseconds, was developed to generate a high degree of supersaturation. The effects of the high saturation pressure and rapid depressurization in polymer foaming process were studied using the apparatus with PMMA as a model polymer. Under the conditions studied, the cell nucleation density increased by more than an order of magnitude over the standard foaming process. Moreover, transparent nanocellular foams were obtained by combining the conditions and two-step foaming process.
