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Citation: ZHU Jun-Feng, ZHANG Guang-Hua, LI Jun-Guo. Preparation and Characterization of Corn Starch Acetates with High Degrees of Substitution[J]. Chinese Journal of Applied Chemistry, ;2006, 23(9): 1010-1013. shu

Preparation and Characterization of Corn Starch Acetates with High Degrees of Substitution

1.
a School of Chemistry and Chemical Engineering, Shaanxi University of Science & Technology, Xianyang;
2.
b Shaanxi Key Laboratory of Additives of Industry, Xianyang 712081

Corresponding author: ZHU Jun-Feng,
Received Date: 15 October 2005
Available Online: 18 April 2006
Fund Project: 陕西科技大学自然科学基金项目资助(ZX04-10) (ZX04-10)

Starch acetates(SA) with different degrees of substitution were synthesized by reaction of corn starch and acetic acid/acetic anhydride catalyzed with concentrated.H₂SO₄.By means of FTIR,SEM,DSC,TGA and XRD,we studied the microstructure,particle shape,meltage temperature,decomposition temperature and crystal degree,and gained better understanding about influences of different degrees of substitution on microstructure and thermal property of starch acetates.With concentrated sulfuric acid as catalyst instead of methyl sulfuric acid,optimal reaction conditions are: refluxing temperature is in the range of 75~80℃, reaction time is 3 h with 0.38 mL of concentrate sulfuric acid.With the increasing of degree of substitution,the crystallinity of the starch acetate decreased from 37.95% to 0,T_d increased from 327.32℃ to 381.35℃.
- degree of substitution,
- starch acetate,
- glass transition temperature,
- crystallinity
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