| Heterogeneous Reactions between Starch and AKD under Solvent-free Conditions |
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| Author Name | Affiliation | | ShanShan Gao1 | 1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province, 266042, China | | XiaoMing Song1,* | 1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province, 266042, China | | FuShan Chen1 | 1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province, 266042, China | | LianQing Huang1 | 1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province, 266042, China | | JunXun Li2 | 2. Taian Shengliyuan Biological Engineering Co., Ltd., Taian, Shandong Province, 271000, China | | SongLin Wang1 | 1. College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao, Shandong Province, 266042, China |
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| Fund Project:The authors greatly appreciate the financial support from Shandong Province Education Department (Grant No. J14LC11), National Natural Science Foundation of China (Grant No. 21406126 and 21576146), Department of Science and Technology of Shandong Pro-vince (Grant No. 2014GSF116001), 973 (Grant No. 2014CB460610), and Department of Science and Technology of Shandong Province(Grant No. 2015ZD-XX0403B03). |
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| Abstract:Oxidized starch powder and cationic starch solution were reacted with alkyl ketene dimer (AKD) under heterogeneous conditions at 70℃ for 12 h. The AKD molecules reacted with starch hydroxyl groups to form β-keto ester linkages under the above conditions. The reaction products were separated into CHCl3-soluble and CHCl3-insoluble fractions. FT-IR spectroscopy, SEM, X-ray diffraction, and TG-DTA analyses of the CHCl3-insoluble fraction indicated that β-keto ester substituents were introduced to hydroxyl groups on the starch surfaces. The results indicated that hydrogen bonds between the starch molecules were disrupted under heterogeneous conditions upon heating. The activity and accessibility of hydroxyl groups were enhanced, as a result of which β-keto ester bonds were produced between AKD and starch. Based on these results, we speculate that the β-keto esters which existed in the sheets sized by AKD emulsions were generated by the reaction between AKD and starch. |
| keywords:AKD cationic starch oxidized starch heterogeneous reaction sizing agent |
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