酸催化的葡萄糖均聚物及葡萄糖瓜尔胶共聚物的合成与结构表征  

Synthesis and Structure Characterization of Acid-Catalyzed Glucose Homopolymer and Glucosyl Guar Gum Copolymer

作　　者：李明鑫 肖亚飞[1] 徐开俊[1] 范敏敏[1] 王克[1] Mingxin Li;Yafei Xiao;Kaijun Xu;Minmin Fan;Ke Wang(Polymer Research Institute of Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学高分子研究所,四川成都610065

出　　处：《高分子材料科学与工程》2020年第10期21-28,共8页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51803136)。

摘　　要：文中采用绿色高效的固态聚合方法,以葡萄糖和瓜尔胶为原料,以酸为催化剂,合成了均聚葡萄糖及葡萄糖基瓜尔胶。最佳的均聚条件为:柠檬酸摩尔分数为20%,反应温度为110℃,反应时间为9 h,通过葡萄糖自聚过程的研究发现,葡萄糖均聚物的主链主要由1,6-连接的葡萄糖元组成,葡聚寡糖最高聚合度可达7。最佳共聚条件为葡萄糖与瓜尔胶的质量比为3∶1(在115℃加热15 h)。通过核磁共振波谱表征了产物的摩尔取代度(MS),最大MS为0.49。核磁分析结果表明,葡萄糖瓜尔胶接枝共聚物上的葡萄糖单元主要连接在瓜尔胶主链上的半乳糖单元上,连接方式以1-6-连接为主。Although branched-chain polysaccharides play an important role in the field of biomedicine and materials,their applications are still relatively limited due to the complex and inefficient synthesis methods.In this paper,a series of oligo-glucose and glucosyl-guar gum were synthesized through green and efficient solid state polymerization,by using glucose and guar gum as raw material,and acid as catalyst.The optimized homo-polymerization conditions are as follows:the molar fraction of citric acid is 20%,the reaction temperature is 110℃,and the reaction time is 9 h.The structure analysis of oligo-glucose indicate that the main chains of oligo-glucose are mainly composed of 1,6-linkage glucosyl residue,the highest polymerization degree of oligo-glucose can reach 6.The optimized copolymerization condition is that the mass ratio of glucose to guar gum is 3∶1(the system is heated at 115℃for 15 h).The molar substitution(MS)of the product was characterized by nuclear magnetic resonance spectroscopy,and the maximum MS is 0.49.NMR analysis results show that the glucose units is grafted onto the galactose units of the guar gum main chains,and the linkage is mainly 1,6-linkage.

关 键 词：葡萄糖 瓜尔胶 共聚物 摩尔取代度 连接方式 

分 类 号：O636.1[理学—高分子化学]