| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
Poly N-Isopropylacrylamide was synthesized using ultrasonic irradiation in a mixed solvent of water and ethanol without chemical initiator. The effects of solvent molar ratio and ultrasonic intensity on time courses of conversion, number average molecular weight, and polydispersity of synthesized polymers were investigated to synthesize the temperature-responsive polymer with low molecular weight distribution (i.e., low polydispersity).
Higher solvent ratio of water to ethanol resulted in higher polymerization rate because ethanol acts as a scavenger in radical polymerization. The higher solvent ratio of also resulted in faster polymer degradation. Higher ultrasonic intensity also resulted in higher polymerization rate and faster polymer degradation. Polymers with low polydispersity were obtained at higher ultrasonic intensity. The transmittance of aqueous solutions of polymers decreased abruptly at a lower critical solution temperature (LCST).
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