黄原胶与丙烯酰胺接枝共聚反应的研究  

Studies on the Synthesis and Characterization of Graft Acrylamide onto Xanthan Gum

作　　者：李仲谨[1] 王磊[1] 程磊[1] 

机构地区：[1]陕西科技大学化学与化工学院,西安710021

出　　处：《天然产物研究与开发》2009年第2期217-220,共4页Natural Product Research and Development

基　　金：国家自然科学基金(50573046);陕西省科学技术研究发展计划(2006K08-G11)

摘　　要：以过硫酸铵为引发剂,在N2气保护下,研究了黄原胶(XG)与丙烯酰胺(AM)的接枝共聚反应。考察了单体浓度、引发剂浓度、反应温度和反应时间等因素对接枝率及接枝效率的影响,探讨了过硫酸铵引发黄原胶接枝丙烯酰胺共聚反应的基本规律。采用红外光谱(FT-IR)、X射线粉末衍射(XRD)对接枝共聚物的结构进行研究,用热重分析(TGA)法表征了产物的热性能,并初步探讨了接枝机理。The graft copolymerization of acrylamide onto Xanthan gum initiated by ammonium persulfate in aqueous medium was studied under a nitrogen atmosphere. The effects of various factors such as monomer concentration, initiator concentration, reaction temperature and time on grafting ratio and grafting efficiency were studied. The reaction regularity of grafting polymerization on Xanthan gum in initiation system was discussed. The graft copolymers were characterized and analyzed by FT-IR and XRD, and the thermal properties were analyzed by TGA. It showed that ammonium persulfate is an efficient initiator for the graft eopolymerization, and acrylamide monomers were successfully graft polymerized onto Xanthan gum, both crystallinity and thermal stability of the graft copolymer are higher commonly than Xanthan gum. The mechanism of graft copolymerization was proposed to explain the formation of radicals and the initiation.

关 键 词：黄原胶 丙烯酰胺 接枝共聚 过硫酸铵 

分 类 号：R285.5[医药卫生—中药学] Q946.91[医药卫生—中医学]