Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (3): 69-72,94.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Grafting Copolymerization of Carboxymethyl Guar Gum and DMC-AM Co-Monomers

Wan Xiao-fang1  Wang Xiao-jun2   

  1. 1.School of Resources Science and Papermaking Engineering, South China University of Technology, Gnangzhou 510640, Guangdong, China; 2. School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China
  • Received:2007-05-23 Revised:2007-06-24 Online:2008-03-25 Published:2008-03-25
  • Contact: 万小芳（1970-），女，讲师，主要从事造纸化学品的研究． E-mail:kelain@126．com
  • About author:万小芳（1970-），女，讲师，主要从事造纸化学品的研究．

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Abstract:

The co-monomers of ethyl methylacrylate-trimethylammonium chloride （ DMC ） and acrylamide （AM） were grafted onto carboxymethyl guar gum （CMGG） to synthesize amphoteric guar gum （AC-GG）, with potassium permanganate/sulfuric acid as the initiator. The effects of the concentrations of the initiator, the monomer and CMGG as well as the degree of substitution （DS） of CMGG on the grafting copolymerization were then investigated. The results show that, in the optimal conditions, the polymerization conversion ratio, the grafting ratio and the grafting efficiency are respectively 92.9%, 797%and 84.7%. Moreover, it is found that potassium permanganate is a high-efficiency initiator because the apparent activation energy calculated by Arrhenius equation is up to 13.28 kJ/mol. The grafting is further characterized by means of 13C-NMR.

Key words: carboxymethyl guar gum, potassium permanganate, grafting copolymerization