Physical Property Control of Aqueous Cellulose Derivatives

2014 Fiscal Year Final Research Report

• 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
• 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

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.

Free Research Field

化学