Rheological Properties of Konjac Glucomannan/SiO_2/Organic-Borate Gels  

作　　者：吴力立 张超灿 

机构地区：[1]Department of Polymer Materials and Engineering,School of Material Sciences and Engineering,Wuhan University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2009年第4期575-580,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by Chinese Natural Science Foundation Committee(No.50673080)

摘　　要：A series of thermoreversible konjac glucomannan gels crosslinked by organic borate were prepared. Required amount of hydrophilic SiO2 was added into the konjac glucomannan solutions before the crosslinking reaction, The gel network was formed through the crosslinking reaction between borate ions dissociated from organic borate and the cis-diol hydroxyl groups on the mannose units of polysaccharide chains. The rheological properties of the complex gels were studied by dynamic viscoelastic measurement. The gelation kinetics of the complex gels was studied and the critical getation points of the gels were exactly determined by the Winter-Chambon criterion. The effects of temperature and composite ratio on the shear storage modulus （G＇）, the loss modulus （G＂） and the sol-gel transition points were investigated.A series of thermoreversible konjac glucomannan gels crosslinked by organic borate were prepared. Required amount of hydrophilic SiO2 was added into the konjac glucomannan solutions before the crosslinking reaction, The gel network was formed through the crosslinking reaction between borate ions dissociated from organic borate and the cis-diol hydroxyl groups on the mannose units of polysaccharide chains. The rheological properties of the complex gels were studied by dynamic viscoelastic measurement. The gelation kinetics of the complex gels was studied and the critical getation points of the gels were exactly determined by the Winter-Chambon criterion. The effects of temperature and composite ratio on the shear storage modulus （G＇）, the loss modulus （G＂） and the sol-gel transition points were investigated.

关 键 词：konjac glucomannan SI02 organic borate rheological properties 

分 类 号：O636.1[理学—高分子化学]