Physical Property Control of Aqueous Cellulose Derivatives
| Project/Area Number |
23550180
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Multi-year Fund |
|---|
| Section | 一般 |
|---|
| Research Field |
Environmental chemistry
|
|---|
| Research Institution | Kyoto University |
|---|
Principal Investigator |
NISHIDA Koji 京都大学, 化学研究所, 准教授 (80189290)
|
|---|
| Project Period (FY) |
2011-04-28 – 2015-03-31
|
| Project Status |
Completed (Fiscal Year 2014)
|
| 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)
|
|---|
| Keywords | メチルセルロース / ヒドロキシプロピルメチルセルロース / キトサン / 添加塩 / LCST / UCST / 高分子電解質 / ゲル化 / 会合誘起相分離 / 相分離 |
|---|
| 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.
|
Report
(5 results)
Research Products
(8 results)
