Effect of Catalyst on the Structure of H2O2 Oxidized Starch and Its Performance as a Ligand in Zirconium Tanning
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TS543;TS23

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the National Key Research and Development Program of China (2017YFB0308500), the Special Program for Science and Technology Cooperation between Sichuan University and Deyang City (XSHZ201613)

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    Abstract:

    Oxidation of starch with H2O2 was catalyzed by tungstate, metavanadate and copper-iron salts, respectively. The oxidation degree of oxidized starch and H2O2 decomposition rate were determined. The functional groups and molecular weight of oxidized starch were characterized by 13C-NMR, FT-IR and GPC. Then the tanning performance of oxidized starch-zirconium complexes was investigated. The hydroxyl groups on the C-2, C-3 and C-6 of glucose unit were oxidized to carbonyl and carboxyl groups, and the glycosidic bonds were broken during oxidation using cooper-iron salts as catalyst. This resulted in a relatively low molecular weight (14628) and a high oxidation degree (72.5%) of the oxidized starch. When it was used as a ligand of zirconium tanning agent, the Zr distribution (97.8%) and fixation (w(ZrO2)=8.0%) in leather were remarkably improved, and the shrinkage temperature of leather achieved 89.7℃, leading to better tanning performance. By comparison, tungstate catalyzed oxidized starch had a higher molecular weight (465095) and a lower oxidation degree (15.0%), and exhibited poorer tanning performance when coordinating with zirconium salt. The properties of metavanadate catalyzed oxidized starch was in between.

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History
  • Received:September 08,2017
  • Revised:January 13,2018
  • Adopted:February 08,2018
  • Online: October 09,2018
  • Published:
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