Preparation and characterization of phthalated cellulose derivatives in room-temperature ionic liquid without catalysts.
Homogeneous modification of cellulose, isolated with 10% KOH from delignified sugarcane bagasse, was performed in room-temperature ionic liquid 1-allyl-3-methylinidazolium chloride with phthalic anhydride in the absence of catalyst. The results showed the degree of substitution of phthalated cellulosic derivatives, ranging from 0.10 to 0.73, increased with the increment of reaction temperature, reaction time, and the molar ratio of phthalic anhydride/anhydroglucose units in cellulose under the conditions given. The products were characterized by FT-IR and solid-state CP/MAS 13C NMR spectroscopy as well as thermal analysis, and the results revealed that the phthalation reaction at C-6, C-2, and C-3 positions of the cellulose all occurred. The thermal stability of the phthalated cellulose was found to decrease upon chemical modification. However, this thermal stability of the phthalated cellulose over 200 degrees C is rather satisfactory.
Liu
Chuan-Fu
CF
State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
Sun
Run-Cang
RC
Zhang
Ai-Ping
AP
Qin
Men-Hua
MH
Ren
Jun-Li
JL
Wang
Xin-Ai
XA
D002482:Cellulose / Q000737:chemistry*; D004355:Drug Stability; D009682:Magnetic Resonance Spectroscopy; D010796:Phthalic Anhydrides / Q000737:chemistry*; D012996:Solutions; D013696:Temperature
D010796:Phthalic Anhydrides; D012996:Solutions; D002482:Cellulose; C043103:phthalic anhydride