高锰酸钾引发马尾松磨石磨木浆与甲基丙烯酸甲酯接枝共聚  

GRAFT COPOLYMERIZATION OF MMA ONTO SGW USING KMnO4 AS INITIATOR

作　　者：何树杰[1] 赵便安[1] 郑国振[1] 黄义芳 高洁[1] 

机构地区：[1]中国科学院广州化学研究所,广州510650

出　　处：《林产化学与工业》1991年第2期127-133,共7页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金资助项目

摘　　要：本文研究了以高锰酸钾为引发剂马尾松磨石磨木浆与甲基丙烯酸甲酯的接枝共聚反应。考察了高锰酸钾浓度和反应时间对接枝反应的影响,从中发现木素既参与接枝,同时也起阻聚作用。为了进一步了解木素和综纤维素在接枝过程中的行为,我们借助于亚氯酸钠-冰乙酸脱木素,72％硫酸水解综纤维素的方法,对接枝产物进行分离,并分别测定各接枝支链上聚甲基丙烯酸甲酯的分子量,由此计算接枝频率。为了探讨木素在接枝共聚中的作用机理,我们将废物进行某些预处理,包括用酸性高锰酸钾溶液预氧化和用重氮甲烷甲基化封闭酚羟基。结果表明,木素结构单元中的酚羟基对接枝反应起着决定的作用、它既可以被氧化为醌型结构起阻聚作用,也可以被引发接枝共聚。Graft copolymerization of MMA onto SGW of Chinese red pine is initiated by KMnO4 in aqueous medium under nitrogen atmosphere. It has been found that lignin takes part in grafting, and acts as an inhibitor as well. To probe the initiating mechanism of KMnO4-lignocellulose system, some pretreatments of substrates are carried out including preoxidation by KMnO4 and methylation of phenolic OH groups with diazomethane. The graft products are separated into lighnin graftomer and holocellulose graftomer. The molecular weight of branches grafted on the backbones of lighin and holocellulose is determined, and graft frequency is calculated. The results show that the phenolic structure of lignin building stone plays decisive effect on grafting. The phenolic structure may be oxidized into quinoid form which acts as an inhibitor. Under proper conditions, however, active sites can be created, thus making itself as an initiator.

关 键 词：甲基 丙烯酸甲酯 磨石磨木浆 共聚 

分 类 号：O632.52[理学—高分子化学]