Formation of Ordered Structure in Liquid Phase and Its Use for Materials Design. Control of Polymer Coating Thickness of Microcapsules Containing Inorganic Microparticles Using Cosolvency of Supercritical Carbon Dioxide.

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  • 液相系における構造形成と機能化　　超臨界二酸化炭素のコソルベンシーを利用した無機微粒子マイクロカプセルに対するポリマーコーティング厚みの制御
  • 超臨界二酸化炭素のコソルベンシーを利用した無機微粒子マイクロカプセルに対するポリマーコーティング厚みの制御
  • チョウリンカイ 2サンカタンソ ノ コソルベンシー オ リヨウ シタ ムキ ビリュウシ マイクロカプセル ニ タイスル ポリマー コーティング アツミ ノ セイギョ

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A novel method to control coating thickness of microcapsules is reported for polymer microcapsules containing inorganic microparticles, in this case silica balloon, iron, silica balloon coated by TiO2 using gas-liquid cosolvency of supercritical carbon dioxide. A suspension of inorganic microparticles incarbon dioxide (CO2) containing a cosolvent and dissolved polymer is sprayed through a nozzle toatmospheric pressure. The polymers are poly(styrene)-poly(methyl methacrylate)-poly(glycidylmethacrylate) triblock copolymer (PS-b-(PMMA-co-PGMA); M.W.=5,000), poly(methyl metha-crylate) (PMMA; M.W.=15,000), poly(ethylene glycol) (PEG; M.W.=7,500), poly(L-lactic acid) (PLLA; M.W.=5,000), and PEG-poly(propylene glycol) (PPG)-PEG triblock copolymer (M.W.=13,000). The solubilities of these polymers in CO2 increase significantly with the use of low molecular weight alcohols as cosolvents. After expansion, the particles do not tend to agglomerate, since the purecosolvent is a nonsolvent for the polymer. The structure and morphology of the microcapsules were investigated by SEM with EPMA, TEM, laser-diffraction particle-size analysis, and optical microscopy. The thickness of the polymer coating about the silica balloon, and likewise, the mean particle diameterand particle size distribution could be controlled by changing the feed composition of the polymer.

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