摘要
研究了以没食子酰基为功能性基团、纤维素为分子骨架的功能高分子材料的合成。将没食子酸先用醋酐进行乙酰化保护酚羟基,后与酰氯化剂SOCl2或PCl5反应,制得三乙酰基没食子酰氯,得率分别为80%和90%;再以吡啶为催化剂与纤维素进行酯化反应制得三乙酰基没食子酰纤维素;然后脱去乙酰基制得功能高分子化合物没食子酰纤维素,酯化率为43.6%。功能特性试验表明,该产物具有吸附结合明胶和络合Fe3+能力,在稀酸、醇和热水中稳定并可再生。1g干产物可结合明胶65.5mg,解吸率约98%;可络合Fe3+76.5mg,解吸率约98%。本研究为进一步研制可用于酿造过程的能结合蛋白质和络合金属离子的新型功能高分子材料奠定了技术基础。
A new functional polymer material, namely galloylcellulose, was synthesized with gallic acid as functional group, and cellulose as molecular skeleton. Gallic acid was firstly acetylized with acetic anhydride to protect phenolic groups, then reacted with SOCl_2 or PCl_5 to prepare intermediate tricetyl-galloylchloride, in which the yields were 80 % and 90 % respectively. Taking pyridin as catalyst, the intermediate was esterified with cellulose. After deacetylating, the target product, galloylcellulose, was obtained with esterification ratio of 43.6 %. Functional test results indicated that 1 g of galloylcellulose can adsorb 65.5 mg gelatin, or complex 76.5 mg Fe 3+ . The desorption ratio was about 98 %. Galloylcellulose is reusable and stable in dilute acidic, ethanolic solutions and hot water. This study established groundwork for further developing commercial product of the new functional polymer material which can be used in brewing process to adsorb proteins and complex heavy metal ions.
出处
《林产化学与工业》
EI
CAS
CSCD
2005年第2期6-10,共5页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(30371135)
