搅拌对桉木浆与甲基丙烯酸缩水甘油酯接枝共聚的影响

采用铈盐和Fe2+-H2O2-二氧化硫脲两种引发体系引发甲基丙烯酸缩水甘油酯与漂白化学桉木浆接枝共聚,研究了搅拌对接枝共聚的影响。搅拌作用的强弱是由搅拌转速、反应器容积和搅拌桨大小共同决定的,三者都对接枝共聚有很大影响,三者有机组合后获得合适的搅拌强度对接枝共聚是极为重要的。除了铈盐引发接枝时环氧基水解率受搅拌转速的影响较大外,两种引发体系下搅拌对接枝的影响规律非常相似。

Effect of Stirring on Graft Copolymerization of Glycidyl Methacrylate onto Eucalyptus Pulp

Bleached eucalyptus pulp was grafted with glycidyl methacrylate (GMA) using ceric salt and Fe2+-H2O2-thioureadioxide initiator systems. The conversion of GMA to copolymer was investigated in dependence on stirring strength,which is closely related to agitator speed,reactor volume and the size of agitator oar. The grafted copolymer formation is found to be strongly influenced by the stirring strength. The proper combination of the agitator speed,reactor volume and agitator oar size to obtain the scientific uniform mixture is very important for the efficient grafting. The grafting behaviors displayed by the stirring in both the ceric salt and Fe2+-H2O2-TD initiator systems were very similar in addition to a more obvious influence on epoxy group hydrolysis by the agitator speed in the ceric salt initiator system.