| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2010: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Research Abstract |
Preparation of the controlled-release materials was carried out using essential oil from Thujopsis dolabrata var. hondae and synthetic L-LA (L-lactide) random copolymers as a base material using scCO2. The contents of oil into poly(L-LA) random copolymers at 75% of L-LA were the highest. The pressure of essential oil impregnated into poly(L-LA) random copolymers was the highest at 14 MPa. In the influence of temperature on impregnation, the amount of essential oil increased with increasing temperature. The mechanical properties (tensile strength, elongation and elastic modulus) of the copolymers impregnated with essential oil were evaluated. The tensile strength and the elastic modulus of poly(L-LA) fell by impregnation of the oil. It turned out that mechanical properties differ in a tendency by polymer. In the degradation test, the residual oil by degradation of copolymer was proportional to degradation rate, and the earliest copolymer of degradation had an early reduction of residual oil.
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