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Homogeneous synthesis and characterization of starch acetates in ionic liquid without catalysts
Author(s) -
Luo Zhigang,
Zhou Zidan
Publication year - 2012
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.201100073
Subject(s) - acetic anhydride , ionic liquid , starch , catalysis , dissolution , fourier transform infrared spectroscopy , chemistry , surface modification , thermal stability , modified starch , nuclear chemistry , chemical modification , organic chemistry , polymer chemistry , chemical engineering , engineering
Homogeneous modification of corn starch with acetic anhydride was performed in ionic liquids 1‐butyl‐3‐methylimidazolium chloride (BMIMCl) without catalysts. The results indicated that the pretreatment of starch, which starch was dissolved in BMIMCl at 105°C for 2 h before reaction, provided feasible reaction environment for starch functionalization. Optimum modification conditions for maximum degree of substitute (DS 2.11) were shown as following: acetic anhydride/anhydroglucose units (AGU) molar ratio 5:1, reaction temperature 105°C and reaction time 2 h. The pretence of acetyl groups in starch products was confirmed by FTIR and 1 H NMR spectroscopy. SEM and XRD data showed that the crystalline structure of native starch was disrupted and new structure was formed during the dissolution and modification processes. The higher DS due to acetylation had a beneficial effect on the thermal stability of samples.