| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2011: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
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| Outline of Final Research Achievements |
Methylcellulose(MS) attains the water-solubility by reducing the strong hydrogen-bonding. The reduction of the hydrogen bonding is achieved by partially substituting hydrophobic methoxy group for hydroxy group in cellulose. However, the substitution gives double-bladed property to the aqueous MS, namely, excessive substitution makes again MS insoluble in water. Therefore, the lower critical solution temperature (LCST) of aqueous MS is found in a restricted extent of temperature. In this study, we have successfully modified the extent of LCST by the addition of various organic salts.
We have also found a structure formation of aqueous MS at 20 °C where the solution has so far been assumed homogeneous, i.e., below the lower critical solution temperature (LCST). With increasing the time of aging at 20 °C, the slower relaxation component increased. Consequently, the time of storage at R.T. affects the solution property in the subsequent heating.
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