N,N-二乙基胺乙基取代瓜尔胶的合成及结构表征

Synthesis and structural characterization of N,N-diethylaminoethyl guar gum

在碱催化条件下,利用N,N-二乙基氯乙胺盐酸盐与瓜尔胶和羟丙基瓜尔胶一步法合成得到N,N-二乙基胺乙基瓜尔胶和N,N-二乙基胺乙基羟丙基瓜尔胶。结果显示合成过程中温度、反应时间、羟丙基取代度及溶剂等因素对产品分子量和N,N-二乙基胺乙基取代度有影响。通过红外光谱和核磁法对N,N-二乙基胺乙基瓜尔胶和羟丙基N,N-二乙基胺乙基瓜尔胶的分子结构进行了分析,并通过碳谱对N,N-二乙基胺乙基在瓜尔胶分子链中糖环上的取代分布进行了分析。

In the base-catalyzed conditions,N, N-diethylaminoethyl guar gum and N,N-diethyl amino ethyl hydroxypropyl guar gum were synthesized by one-step process. On the basis of investigation on reaction factors such as the reaction temperature, the reaction time, MS of HPG and solvent on the molecular weight of products and MS of N,N-diethylamido ethyl,the proper synthetic condition was obtained. Using NMR analysis technique, MS and DS of N, N-diethylamino ethyl guar gum and N, N-diethylamino ethyl hydroxypropyl guar gum were determined.