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Polymers and Polymer Composites

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Title: Highly efficient encapsulation of ingredients in poly(methyl methacrylate) capsules using a superoleophobic material
Page Range: p.129-134
Author(s): Takayuki Takei; Kiyotaka Araki; Keita Terazono; Yoshihiro Ozuno; Gen Hayase; Kazuyoshi Kanamori; Kazuki Nakanishi; Masahiro Yoshida
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 25
Issue No: No.2

Increasing the efficiency of encapsulation of ingredients into spherical capsules can decrease the manufacturing costs of the capsules. Ingredients can be encapsulated with high efficiency (>99%) into nondegradable hard resin capsules prepared by polymerisation of spherical droplets of trimethylolpropane trimethacrylate (TRIM) monomer placed on a superoleophobic material. Poly(methyl methacrylate) (PMMA) resin is a more versatile capsule material than poly-TRIM resin. In this study, the efficiency of encapsulation in PMMA resin capsules prepared from methyl methacrylate (MMA) monomer was investigated. To reduce the volatility of the MMA monomer, pre-polymerised MMA was used for capsule preparation. Although non-volatile e-tocopherol and doxorubicin could be encapsulated in the capsules with high efficiency by heat polymerisation at 60 deg C for 3 h, the efficiency for volatile tetradecane was much lower (approximately 60%) because it evaporated. Furthermore, even when using pre-polymerised MMA, more than 70% of the prepolymer evaporated during polymerisation. To prevent the evaporation of tetradecane and the prepolymer, ultraviolet photopolymerisation was adopted because it was faster and could be conducted at a lower temperature. The photopolymerisation prevented the evaporation of the prepolymer and increased the efficiency of encapsulation of tetradecane (approximately 90% efficiency). This polymerisation system is effective for encapsulation of ingredients in PMMA capsules with high efficiency. 25 Refs.