Succinoylation of wheat straw hemicelluloses with a low degree of substitution in aqueous systems

✍ Scribed by Runcang Sun; X. F. Sun; X. Bing

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 234 KB
• Volume: 83
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.2270

✦ Synopsis

Abstract

The reaction of wheat straw hemicelluloses with succinic anhydride in aqueous alkaline systems was studied. The products showed a rather low degree of substitution, ranging from 0.017 to 0.21. The effects of reaction times of 0.5–16 h, temperatures of 25–45°C, and molar ratios of succinic anhydride to anhydroxylose units in hemicelluloses of 1:5–1:1 on the succinoylation yield and degree of substitution were examined. With the reaction kept within a pH range of 8.5–9.0, a temperature range of 25–28°C, a reaction duration of 1–2 h, and a 1:1 molar ratio of succinic anhydride to hemicelluloses were preferred. The structure of the resulting polymers was determined with Fourier transform infrared and ^1^H‐ and ^13^C‐NMR spectroscopy, which indicated monoester substitution. The thermal stability of the esterified polymer increased with chemical modification. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 757–766, 2002